drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/usb.h>
  44 #include <linux/usbdevice_fs.h>
  45 #include <linux/usb/hcd.h>      /* for usbcore internals */
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <asm/uaccess.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/moduleparam.h>
  52
  53 #include "usb.h"
  54
  55 #define USB_MAXBUS                      64
  56 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  57
  58 /* Mutual exclusion for removal, open, and release */
  59 DEFINE_MUTEX(usbfs_mutex);
  60
  61 struct dev_state {
  62         struct list_head list;      /* state list */
  63         struct usb_device *dev;
  64         struct file *file;
  65         spinlock_t lock;            /* protects the async urb lists */
  66         struct list_head async_pending;
  67         struct list_head async_completed;
  68         wait_queue_head_t wait;     /* wake up if a request completed */
  69         unsigned int discsignr;
  70         struct pid *disc_pid;
  71         uid_t disc_uid, disc_euid;
  72         void __user *disccontext;
  73         unsigned long ifclaimed;
  74         u32 secid;
  75         u32 disabled_bulk_eps;
  76 };
  77
  78 struct async {
  79         struct list_head asynclist;
  80         struct dev_state *ps;
  81         struct pid *pid;
  82         uid_t uid, euid;
  83         unsigned int signr;
  84         unsigned int ifnum;
  85         void __user *userbuffer;
  86         void __user *userurb;
  87         struct urb *urb;
  88         int status;
  89         u32 secid;
  90         u8 bulk_addr;
  91         u8 bulk_status;
  92 };
  93
  94 static int usbfs_snoop;
  95 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  96 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  97
  98 #define snoop(dev, format, arg...)                              \
  99         do {                                                    \
 100                 if (usbfs_snoop)                                \
 101                         dev_info(dev , format , ## arg);        \
 102         } while (0)
 103
 104 enum snoop_when {
 105         SUBMIT, COMPLETE
 106 };
 107
 108 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 109
 110 #define MAX_USBFS_BUFFER_SIZE   16384
 111
 112
 113 static int connected(struct dev_state *ps)
 114 {
 115         return (!list_empty(&ps->list) &&
 116                         ps->dev->state != USB_STATE_NOTATTACHED);
 117 }
 118
 119 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 120 {
 121         loff_t ret;
 122
 123         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 124
 125         switch (orig) {
 126         case 0:
 127                 file->f_pos = offset;
 128                 ret = file->f_pos;
 129                 break;
 130         case 1:
 131                 file->f_pos += offset;
 132                 ret = file->f_pos;
 133                 break;
 134         case 2:
 135         default:
 136                 ret = -EINVAL;
 137         }
 138
 139         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 140         return ret;
 141 }
 142
 143 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 144                            loff_t *ppos)
 145 {
 146         struct dev_state *ps = file->private_data;
 147         struct usb_device *dev = ps->dev;
 148         ssize_t ret = 0;
 149         unsigned len;
 150         loff_t pos;
 151         int i;
 152
 153         pos = *ppos;
 154         usb_lock_device(dev);
 155         if (!connected(ps)) {
 156                 ret = -ENODEV;
 157                 goto err;
 158         } else if (pos < 0) {
 159                 ret = -EINVAL;
 160                 goto err;
 161         }
 162
 163         if (pos < sizeof(struct usb_device_descriptor)) {
 164                 /* 18 bytes - fits on the stack */
 165                 struct usb_device_descriptor temp_desc;
 166
 167                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 168                 le16_to_cpus(&temp_desc.bcdUSB);
 169                 le16_to_cpus(&temp_desc.idVendor);
 170                 le16_to_cpus(&temp_desc.idProduct);
 171                 le16_to_cpus(&temp_desc.bcdDevice);
 172
 173                 len = sizeof(struct usb_device_descriptor) - pos;
 174                 if (len > nbytes)
 175                         len = nbytes;
 176                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 177                         ret = -EFAULT;
 178                         goto err;
 179                 }
 180
 181                 *ppos += len;
 182                 buf += len;
 183                 nbytes -= len;
 184                 ret += len;
 185         }
 186
 187         pos = sizeof(struct usb_device_descriptor);
 188         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 189                 struct usb_config_descriptor *config =
 190                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 191                 unsigned int length = le16_to_cpu(config->wTotalLength);
 192
 193                 if (*ppos < pos + length) {
 194
 195                         /* The descriptor may claim to be longer than it
 196                          * really is.  Here is the actual allocated length. */
 197                         unsigned alloclen =
 198                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 199
 200                         len = length - (*ppos - pos);
 201                         if (len > nbytes)
 202                                 len = nbytes;
 203
 204                         /* Simply don't write (skip over) unallocated parts */
 205                         if (alloclen > (*ppos - pos)) {
 206                                 alloclen -= (*ppos - pos);
 207                                 if (copy_to_user(buf,
 208                                     dev->rawdescriptors[i] + (*ppos - pos),
 209                                     min(len, alloclen))) {
 210                                         ret = -EFAULT;
 211                                         goto err;
 212                                 }
 213                         }
 214
 215                         *ppos += len;
 216                         buf += len;
 217                         nbytes -= len;
 218                         ret += len;
 219                 }
 220
 221                 pos += length;
 222         }
 223
 224 err:
 225         usb_unlock_device(dev);
 226         return ret;
 227 }
 228
 229 /*
 230  * async list handling
 231  */
 232
 233 static struct async *alloc_async(unsigned int numisoframes)
 234 {
 235         struct async *as;
 236
 237         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 238         if (!as)
 239                 return NULL;
 240         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 241         if (!as->urb) {
 242                 kfree(as);
 243                 return NULL;
 244         }
 245         return as;
 246 }
 247
 248 static void free_async(struct async *as)
 249 {
 250         put_pid(as->pid);
 251         kfree(as->urb->transfer_buffer);
 252         kfree(as->urb->setup_packet);
 253         usb_free_urb(as->urb);
 254         kfree(as);
 255 }
 256
 257 static void async_newpending(struct async *as)
 258 {
 259         struct dev_state *ps = as->ps;
 260         unsigned long flags;
 261
 262         spin_lock_irqsave(&ps->lock, flags);
 263         list_add_tail(&as->asynclist, &ps->async_pending);
 264         spin_unlock_irqrestore(&ps->lock, flags);
 265 }
 266
 267 static void async_removepending(struct async *as)
 268 {
 269         struct dev_state *ps = as->ps;
 270         unsigned long flags;
 271
 272         spin_lock_irqsave(&ps->lock, flags);
 273         list_del_init(&as->asynclist);
 274         spin_unlock_irqrestore(&ps->lock, flags);
 275 }
 276
 277 static struct async *async_getcompleted(struct dev_state *ps)
 278 {
 279         unsigned long flags;
 280         struct async *as = NULL;
 281
 282         spin_lock_irqsave(&ps->lock, flags);
 283         if (!list_empty(&ps->async_completed)) {
 284                 as = list_entry(ps->async_completed.next, struct async,
 285                                 asynclist);
 286                 list_del_init(&as->asynclist);
 287         }
 288         spin_unlock_irqrestore(&ps->lock, flags);
 289         return as;
 290 }
 291
 292 static struct async *async_getpending(struct dev_state *ps,
 293                                              void __user *userurb)
 294 {
 295         struct async *as;
 296
 297         list_for_each_entry(as, &ps->async_pending, asynclist)
 298                 if (as->userurb == userurb) {
 299                         list_del_init(&as->asynclist);
 300                         return as;
 301                 }
 302
 303         return NULL;
 304 }
 305
 306 static void snoop_urb(struct usb_device *udev,
 307                 void __user *userurb, int pipe, unsigned length,
 308                 int timeout_or_status, enum snoop_when when,
 309                 unsigned char *data, unsigned data_len)
 310 {
 311         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 312         static const char *dirs[] = {"out", "in"};
 313         int ep;
 314         const char *t, *d;
 315
 316         if (!usbfs_snoop)
 317                 return;
 318
 319         ep = usb_pipeendpoint(pipe);
 320         t = types[usb_pipetype(pipe)];
 321         d = dirs[!!usb_pipein(pipe)];
 322
 323         if (userurb) {          /* Async */
 324                 if (when == SUBMIT)
 325                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 326                                         "length %u\n",
 327                                         userurb, ep, t, d, length);
 328                 else
 329                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 330                                         "actual_length %u status %d\n",
 331                                         userurb, ep, t, d, length,
 332                                         timeout_or_status);
 333         } else {
 334                 if (when == SUBMIT)
 335                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 336                                         "timeout %d\n",
 337                                         ep, t, d, length, timeout_or_status);
 338                 else
 339                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 340                                         "status %d\n",
 341                                         ep, t, d, length, timeout_or_status);
 342         }
 343
 344         if (data && data_len > 0) {
 345                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 346                         data, data_len, 1);
 347         }
 348 }
 349
 350 #define AS_CONTINUATION 1
 351 #define AS_UNLINK       2
 352
 353 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 354 __releases(ps->lock)
 355 __acquires(ps->lock)
 356 {
 357         struct urb *urb;
 358         struct async *as;
 359
 360         /* Mark all the pending URBs that match bulk_addr, up to but not
 361          * including the first one without AS_CONTINUATION.  If such an
 362          * URB is encountered then a new transfer has already started so
 363          * the endpoint doesn't need to be disabled; otherwise it does.
 364          */
 365         list_for_each_entry(as, &ps->async_pending, asynclist) {
 366                 if (as->bulk_addr == bulk_addr) {
 367                         if (as->bulk_status != AS_CONTINUATION)
 368                                 goto rescan;
 369                         as->bulk_status = AS_UNLINK;
 370                         as->bulk_addr = 0;
 371                 }
 372         }
 373         ps->disabled_bulk_eps |= (1 << bulk_addr);
 374
 375         /* Now carefully unlink all the marked pending URBs */
 376  rescan:
 377         list_for_each_entry(as, &ps->async_pending, asynclist) {
 378                 if (as->bulk_status == AS_UNLINK) {
 379                         as->bulk_status = 0;            /* Only once */
 380                         urb = as->urb;
 381                         usb_get_urb(urb);
 382                         spin_unlock(&ps->lock);         /* Allow completions */
 383                         usb_unlink_urb(urb);
 384                         usb_put_urb(urb);
 385                         spin_lock(&ps->lock);
 386                         goto rescan;
 387                 }
 388         }
 389 }
 390
 391 static void async_completed(struct urb *urb)
 392 {
 393         struct async *as = urb->context;
 394         struct dev_state *ps = as->ps;
 395         struct siginfo sinfo;
 396         struct pid *pid = NULL;
 397         uid_t uid = 0;
 398         uid_t euid = 0;
 399         u32 secid = 0;
 400         int signr;
 401
 402         spin_lock(&ps->lock);
 403         list_move_tail(&as->asynclist, &ps->async_completed);
 404         as->status = urb->status;
 405         signr = as->signr;
 406         if (signr) {
 407                 sinfo.si_signo = as->signr;
 408                 sinfo.si_errno = as->status;
 409                 sinfo.si_code = SI_ASYNCIO;
 410                 sinfo.si_addr = as->userurb;
 411                 pid = get_pid(as->pid);
 412                 uid = as->uid;
 413                 euid = as->euid;
 414                 secid = as->secid;
 415         }
 416         snoop(&urb->dev->dev, "urb complete\n");
 417         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 418                         as->status, COMPLETE,
 419                         ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
 420                                 NULL : urb->transfer_buffer, urb->actual_length);
 421         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 422                         as->status != -ENOENT)
 423                 cancel_bulk_urbs(ps, as->bulk_addr);
 424         spin_unlock(&ps->lock);
 425
 426         if (signr) {
 427                 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
 428                                       euid, secid);
 429                 put_pid(pid);
 430         }
 431
 432         wake_up(&ps->wait);
 433 }
 434
 435 static void destroy_async(struct dev_state *ps, struct list_head *list)
 436 {
 437         struct urb *urb;
 438         struct async *as;
 439         unsigned long flags;
 440
 441         spin_lock_irqsave(&ps->lock, flags);
 442         while (!list_empty(list)) {
 443                 as = list_entry(list->next, struct async, asynclist);
 444                 list_del_init(&as->asynclist);
 445                 urb = as->urb;
 446                 usb_get_urb(urb);
 447
 448                 /* drop the spinlock so the completion handler can run */
 449                 spin_unlock_irqrestore(&ps->lock, flags);
 450                 usb_kill_urb(urb);
 451                 usb_put_urb(urb);
 452                 spin_lock_irqsave(&ps->lock, flags);
 453         }
 454         spin_unlock_irqrestore(&ps->lock, flags);
 455 }
 456
 457 static void destroy_async_on_interface(struct dev_state *ps,
 458                                        unsigned int ifnum)
 459 {
 460         struct list_head *p, *q, hitlist;
 461         unsigned long flags;
 462
 463         INIT_LIST_HEAD(&hitlist);
 464         spin_lock_irqsave(&ps->lock, flags);
 465         list_for_each_safe(p, q, &ps->async_pending)
 466                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 467                         list_move_tail(p, &hitlist);
 468         spin_unlock_irqrestore(&ps->lock, flags);
 469         destroy_async(ps, &hitlist);
 470 }
 471
 472 static void destroy_all_async(struct dev_state *ps)
 473 {
 474         destroy_async(ps, &ps->async_pending);
 475 }
 476
 477 /*
 478  * interface claims are made only at the request of user level code,
 479  * which can also release them (explicitly or by closing files).
 480  * they're also undone when devices disconnect.
 481  */
 482
 483 static int driver_probe(struct usb_interface *intf,
 484                         const struct usb_device_id *id)
 485 {
 486         return -ENODEV;
 487 }
 488
 489 static void driver_disconnect(struct usb_interface *intf)
 490 {
 491         struct dev_state *ps = usb_get_intfdata(intf);
 492         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 493
 494         if (!ps)
 495                 return;
 496
 497         /* NOTE:  this relies on usbcore having canceled and completed
 498          * all pending I/O requests; 2.6 does that.
 499          */
 500
 501         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 502                 clear_bit(ifnum, &ps->ifclaimed);
 503         else
 504                 dev_warn(&intf->dev, "interface number %u out of range\n",
 505                          ifnum);
 506
 507         usb_set_intfdata(intf, NULL);
 508
 509         /* force async requests to complete */
 510         destroy_async_on_interface(ps, ifnum);
 511 }
 512
 513 /* The following routines are merely placeholders.  There is no way
 514  * to inform a user task about suspend or resumes.
 515  */
 516 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 517 {
 518         return 0;
 519 }
 520
 521 static int driver_resume(struct usb_interface *intf)
 522 {
 523         return 0;
 524 }
 525
 526 struct usb_driver usbfs_driver = {
 527         .name =         "usbfs",
 528         .probe =        driver_probe,
 529         .disconnect =   driver_disconnect,
 530         .suspend =      driver_suspend,
 531         .resume =       driver_resume,
 532 };
 533
 534 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 535 {
 536         struct usb_device *dev = ps->dev;
 537         struct usb_interface *intf;
 538         int err;
 539
 540         if (ifnum >= 8*sizeof(ps->ifclaimed))
 541                 return -EINVAL;
 542         /* already claimed */
 543         if (test_bit(ifnum, &ps->ifclaimed))
 544                 return 0;
 545
 546         intf = usb_ifnum_to_if(dev, ifnum);
 547         if (!intf)
 548                 err = -ENOENT;
 549         else
 550                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 551         if (err == 0)
 552                 set_bit(ifnum, &ps->ifclaimed);
 553         return err;
 554 }
 555
 556 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 557 {
 558         struct usb_device *dev;
 559         struct usb_interface *intf;
 560         int err;
 561
 562         err = -EINVAL;
 563         if (ifnum >= 8*sizeof(ps->ifclaimed))
 564                 return err;
 565         dev = ps->dev;
 566         intf = usb_ifnum_to_if(dev, ifnum);
 567         if (!intf)
 568                 err = -ENOENT;
 569         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 570                 usb_driver_release_interface(&usbfs_driver, intf);
 571                 err = 0;
 572         }
 573         return err;
 574 }
 575
 576 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 577 {
 578         if (ps->dev->state != USB_STATE_CONFIGURED)
 579                 return -EHOSTUNREACH;
 580         if (ifnum >= 8*sizeof(ps->ifclaimed))
 581                 return -EINVAL;
 582         if (test_bit(ifnum, &ps->ifclaimed))
 583                 return 0;
 584         /* if not yet claimed, claim it for the driver */
 585         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 586                  "interface %u before use\n", task_pid_nr(current),
 587                  current->comm, ifnum);
 588         return claimintf(ps, ifnum);
 589 }
 590
 591 static int findintfep(struct usb_device *dev, unsigned int ep)
 592 {
 593         unsigned int i, j, e;
 594         struct usb_interface *intf;
 595         struct usb_host_interface *alts;
 596         struct usb_endpoint_descriptor *endpt;
 597
 598         if (ep & ~(USB_DIR_IN|0xf))
 599                 return -EINVAL;
 600         if (!dev->actconfig)
 601                 return -ESRCH;
 602         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 603                 intf = dev->actconfig->interface[i];
 604                 for (j = 0; j < intf->num_altsetting; j++) {
 605                         alts = &intf->altsetting[j];
 606                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 607                                 endpt = &alts->endpoint[e].desc;
 608                                 if (endpt->bEndpointAddress == ep)
 609                                         return alts->desc.bInterfaceNumber;
 610                         }
 611                 }
 612         }
 613         return -ENOENT;
 614 }
 615
 616 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 617                            unsigned int request, unsigned int index)
 618 {
 619         int ret = 0;
 620         struct usb_host_interface *alt_setting;
 621
 622         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 623          && ps->dev->state != USB_STATE_ADDRESS
 624          && ps->dev->state != USB_STATE_CONFIGURED)
 625                 return -EHOSTUNREACH;
 626         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 627                 return 0;
 628
 629         /*
 630          * check for the special corner case 'get_device_id' in the printer
 631          * class specification, where wIndex is (interface << 8 | altsetting)
 632          * instead of just interface
 633          */
 634         if (requesttype == 0xa1 && request == 0) {
 635                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 636                                                    index >> 8, index & 0xff);
 637                 if (alt_setting
 638                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 639                         index >>= 8;
 640         }
 641
 642         index &= 0xff;
 643         switch (requesttype & USB_RECIP_MASK) {
 644         case USB_RECIP_ENDPOINT:
 645                 ret = findintfep(ps->dev, index);
 646                 if (ret >= 0)
 647                         ret = checkintf(ps, ret);
 648                 break;
 649
 650         case USB_RECIP_INTERFACE:
 651                 ret = checkintf(ps, index);
 652                 break;
 653         }
 654         return ret;
 655 }
 656
 657 static int match_devt(struct device *dev, void *data)
 658 {
 659         return dev->devt == (dev_t) (unsigned long) data;
 660 }
 661
 662 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 663 {
 664         struct device *dev;
 665
 666         dev = bus_find_device(&usb_bus_type, NULL,
 667                               (void *) (unsigned long) devt, match_devt);
 668         if (!dev)
 669                 return NULL;
 670         return container_of(dev, struct usb_device, dev);
 671 }
 672
 673 /*
 674  * file operations
 675  */
 676 static int usbdev_open(struct inode *inode, struct file *file)
 677 {
 678         struct usb_device *dev = NULL;
 679         struct dev_state *ps;
 680         const struct cred *cred = current_cred();
 681         int ret;
 682
 683         ret = -ENOMEM;
 684         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 685         if (!ps)
 686                 goto out_free_ps;
 687
 688         ret = -ENODEV;
 689
 690         /* Protect against simultaneous removal or release */
 691         mutex_lock(&usbfs_mutex);
 692
 693         /* usbdev device-node */
 694         if (imajor(inode) == USB_DEVICE_MAJOR)
 695                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 696
 697 #ifdef CONFIG_USB_DEVICEFS
 698         /* procfs file */
 699         if (!dev) {
 700                 dev = inode->i_private;
 701                 if (dev && dev->usbfs_dentry &&
 702                                         dev->usbfs_dentry->d_inode == inode)
 703                         usb_get_dev(dev);
 704                 else
 705                         dev = NULL;
 706         }
 707 #endif
 708         mutex_unlock(&usbfs_mutex);
 709
 710         if (!dev)
 711                 goto out_free_ps;
 712
 713         usb_lock_device(dev);
 714         if (dev->state == USB_STATE_NOTATTACHED)
 715                 goto out_unlock_device;
 716
 717         ret = usb_autoresume_device(dev);
 718         if (ret)
 719                 goto out_unlock_device;
 720
 721         ps->dev = dev;
 722         ps->file = file;
 723         spin_lock_init(&ps->lock);
 724         INIT_LIST_HEAD(&ps->list);
 725         INIT_LIST_HEAD(&ps->async_pending);
 726         INIT_LIST_HEAD(&ps->async_completed);
 727         init_waitqueue_head(&ps->wait);
 728         ps->discsignr = 0;
 729         ps->disc_pid = get_pid(task_pid(current));
 730         ps->disc_uid = cred->uid;
 731         ps->disc_euid = cred->euid;
 732         ps->disccontext = NULL;
 733         ps->ifclaimed = 0;
 734         security_task_getsecid(current, &ps->secid);
 735         smp_wmb();
 736         list_add_tail(&ps->list, &dev->filelist);
 737         file->private_data = ps;
 738         usb_unlock_device(dev);
 739         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 740                         current->comm);
 741         return ret;
 742
 743  out_unlock_device:
 744         usb_unlock_device(dev);
 745         usb_put_dev(dev);
 746  out_free_ps:
 747         kfree(ps);
 748         return ret;
 749 }
 750
 751 static int usbdev_release(struct inode *inode, struct file *file)
 752 {
 753         struct dev_state *ps = file->private_data;
 754         struct usb_device *dev = ps->dev;
 755         unsigned int ifnum;
 756         struct async *as;
 757
 758         usb_lock_device(dev);
 759         usb_hub_release_all_ports(dev, ps);
 760
 761         list_del_init(&ps->list);
 762
 763         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 764                         ifnum++) {
 765                 if (test_bit(ifnum, &ps->ifclaimed))
 766                         releaseintf(ps, ifnum);
 767         }
 768         destroy_all_async(ps);
 769         usb_autosuspend_device(dev);
 770         usb_unlock_device(dev);
 771         usb_put_dev(dev);
 772         put_pid(ps->disc_pid);
 773
 774         as = async_getcompleted(ps);
 775         while (as) {
 776                 free_async(as);
 777                 as = async_getcompleted(ps);
 778         }
 779         kfree(ps);
 780         return 0;
 781 }
 782
 783 static int proc_control(struct dev_state *ps, void __user *arg)
 784 {
 785         struct usb_device *dev = ps->dev;
 786         struct usbdevfs_ctrltransfer ctrl;
 787         unsigned int tmo;
 788         unsigned char *tbuf;
 789         unsigned wLength;
 790         int i, pipe, ret;
 791
 792         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 793                 return -EFAULT;
 794         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 795                               ctrl.wIndex);
 796         if (ret)
 797                 return ret;
 798         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 799         if (wLength > PAGE_SIZE)
 800                 return -EINVAL;
 801         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 802         if (!tbuf)
 803                 return -ENOMEM;
 804         tmo = ctrl.timeout;
 805         snoop(&dev->dev, "control urb: bRequestType=%02x "
 806                 "bRequest=%02x wValue=%04x "
 807                 "wIndex=%04x wLength=%04x\n",
 808                 ctrl.bRequestType, ctrl.bRequest,
 809                 __le16_to_cpup(&ctrl.wValue),
 810                 __le16_to_cpup(&ctrl.wIndex),
 811                 __le16_to_cpup(&ctrl.wLength));
 812         if (ctrl.bRequestType & 0x80) {
 813                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 814                                                ctrl.wLength)) {
 815                         free_page((unsigned long)tbuf);
 816                         return -EINVAL;
 817                 }
 818                 pipe = usb_rcvctrlpipe(dev, 0);
 819                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 820
 821                 usb_unlock_device(dev);
 822                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 823                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 824                                     tbuf, ctrl.wLength, tmo);
 825                 usb_lock_device(dev);
 826                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 827                           tbuf, max(i, 0));
 828                 if ((i > 0) && ctrl.wLength) {
 829                         if (copy_to_user(ctrl.data, tbuf, i)) {
 830                                 free_page((unsigned long)tbuf);
 831                                 return -EFAULT;
 832                         }
 833                 }
 834         } else {
 835                 if (ctrl.wLength) {
 836                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 837                                 free_page((unsigned long)tbuf);
 838                                 return -EFAULT;
 839                         }
 840                 }
 841                 pipe = usb_sndctrlpipe(dev, 0);
 842                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 843                         tbuf, ctrl.wLength);
 844
 845                 usb_unlock_device(dev);
 846                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 847                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 848                                     tbuf, ctrl.wLength, tmo);
 849                 usb_lock_device(dev);
 850                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 851         }
 852         free_page((unsigned long)tbuf);
 853         if (i < 0 && i != -EPIPE) {
 854                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 855                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 856                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 857                            ctrl.wLength, i);
 858         }
 859         return i;
 860 }
 861
 862 static int proc_bulk(struct dev_state *ps, void __user *arg)
 863 {
 864         struct usb_device *dev = ps->dev;
 865         struct usbdevfs_bulktransfer bulk;
 866         unsigned int tmo, len1, pipe;
 867         int len2;
 868         unsigned char *tbuf;
 869         int i, ret;
 870
 871         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 872                 return -EFAULT;
 873         ret = findintfep(ps->dev, bulk.ep);
 874         if (ret < 0)
 875                 return ret;
 876         ret = checkintf(ps, ret);
 877         if (ret)
 878                 return ret;
 879         if (bulk.ep & USB_DIR_IN)
 880                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 881         else
 882                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 883         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 884                 return -EINVAL;
 885         len1 = bulk.len;
 886         if (len1 > MAX_USBFS_BUFFER_SIZE)
 887                 return -EINVAL;
 888         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 889                 return -ENOMEM;
 890         tmo = bulk.timeout;
 891         if (bulk.ep & 0x80) {
 892                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 893                         kfree(tbuf);
 894                         return -EINVAL;
 895                 }
 896                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 897
 898                 usb_unlock_device(dev);
 899                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 900                 usb_lock_device(dev);
 901                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
 902
 903                 if (!i && len2) {
 904                         if (copy_to_user(bulk.data, tbuf, len2)) {
 905                                 kfree(tbuf);
 906                                 return -EFAULT;
 907                         }
 908                 }
 909         } else {
 910                 if (len1) {
 911                         if (copy_from_user(tbuf, bulk.data, len1)) {
 912                                 kfree(tbuf);
 913                                 return -EFAULT;
 914                         }
 915                 }
 916                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
 917
 918                 usb_unlock_device(dev);
 919                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 920                 usb_lock_device(dev);
 921                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
 922         }
 923         kfree(tbuf);
 924         if (i < 0)
 925                 return i;
 926         return len2;
 927 }
 928
 929 static int proc_resetep(struct dev_state *ps, void __user *arg)
 930 {
 931         unsigned int ep;
 932         int ret;
 933
 934         if (get_user(ep, (unsigned int __user *)arg))
 935                 return -EFAULT;
 936         ret = findintfep(ps->dev, ep);
 937         if (ret < 0)
 938                 return ret;
 939         ret = checkintf(ps, ret);
 940         if (ret)
 941                 return ret;
 942         usb_reset_endpoint(ps->dev, ep);
 943         return 0;
 944 }
 945
 946 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 947 {
 948         unsigned int ep;
 949         int pipe;
 950         int ret;
 951
 952         if (get_user(ep, (unsigned int __user *)arg))
 953                 return -EFAULT;
 954         ret = findintfep(ps->dev, ep);
 955         if (ret < 0)
 956                 return ret;
 957         ret = checkintf(ps, ret);
 958         if (ret)
 959                 return ret;
 960         if (ep & USB_DIR_IN)
 961                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 962         else
 963                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 964
 965         return usb_clear_halt(ps->dev, pipe);
 966 }
 967
 968 static int proc_getdriver(struct dev_state *ps, void __user *arg)
 969 {
 970         struct usbdevfs_getdriver gd;
 971         struct usb_interface *intf;
 972         int ret;
 973
 974         if (copy_from_user(&gd, arg, sizeof(gd)))
 975                 return -EFAULT;
 976         intf = usb_ifnum_to_if(ps->dev, gd.interface);
 977         if (!intf || !intf->dev.driver)
 978                 ret = -ENODATA;
 979         else {
 980                 strncpy(gd.driver, intf->dev.driver->name,
 981                                 sizeof(gd.driver));
 982                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 983         }
 984         return ret;
 985 }
 986
 987 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 988 {
 989         struct usbdevfs_connectinfo ci = {
 990                 .devnum = ps->dev->devnum,
 991                 .slow = ps->dev->speed == USB_SPEED_LOW
 992         };
 993
 994         if (copy_to_user(arg, &ci, sizeof(ci)))
 995                 return -EFAULT;
 996         return 0;
 997 }
 998
 999 static int proc_resetdevice(struct dev_state *ps)
1000 {
1001         return usb_reset_device(ps->dev);
1002 }
1003
1004 static int proc_setintf(struct dev_state *ps, void __user *arg)
1005 {
1006         struct usbdevfs_setinterface setintf;
1007         int ret;
1008
1009         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1010                 return -EFAULT;
1011         if ((ret = checkintf(ps, setintf.interface)))
1012                 return ret;
1013         return usb_set_interface(ps->dev, setintf.interface,
1014                         setintf.altsetting);
1015 }
1016
1017 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1018 {
1019         int u;
1020         int status = 0;
1021         struct usb_host_config *actconfig;
1022
1023         if (get_user(u, (int __user *)arg))
1024                 return -EFAULT;
1025
1026         actconfig = ps->dev->actconfig;
1027
1028         /* Don't touch the device if any interfaces are claimed.
1029          * It could interfere with other drivers' operations, and if
1030          * an interface is claimed by usbfs it could easily deadlock.
1031          */
1032         if (actconfig) {
1033                 int i;
1034
1035                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1036                         if (usb_interface_claimed(actconfig->interface[i])) {
1037                                 dev_warn(&ps->dev->dev,
1038                                         "usbfs: interface %d claimed by %s "
1039                                         "while '%s' sets config #%d\n",
1040                                         actconfig->interface[i]
1041                                                 ->cur_altsetting
1042                                                 ->desc.bInterfaceNumber,
1043                                         actconfig->interface[i]
1044                                                 ->dev.driver->name,
1045                                         current->comm, u);
1046                                 status = -EBUSY;
1047                                 break;
1048                         }
1049                 }
1050         }
1051
1052         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1053          * so avoid usb_set_configuration()'s kick to sysfs
1054          */
1055         if (status == 0) {
1056                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1057                         status = usb_reset_configuration(ps->dev);
1058                 else
1059                         status = usb_set_configuration(ps->dev, u);
1060         }
1061
1062         return status;
1063 }
1064
1065 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1066                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1067                         void __user *arg)
1068 {
1069         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1070         struct usb_host_endpoint *ep;
1071         struct async *as;
1072         struct usb_ctrlrequest *dr = NULL;
1073         const struct cred *cred = current_cred();
1074         unsigned int u, totlen, isofrmlen;
1075         int ret, ifnum = -1;
1076         int is_in;
1077
1078         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1079                                 USBDEVFS_URB_SHORT_NOT_OK |
1080                                 USBDEVFS_URB_BULK_CONTINUATION |
1081                                 USBDEVFS_URB_NO_FSBR |
1082                                 USBDEVFS_URB_ZERO_PACKET |
1083                                 USBDEVFS_URB_NO_INTERRUPT))
1084                 return -EINVAL;
1085         if (uurb->buffer_length > 0 && !uurb->buffer)
1086                 return -EINVAL;
1087         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1088             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1089                 ifnum = findintfep(ps->dev, uurb->endpoint);
1090                 if (ifnum < 0)
1091                         return ifnum;
1092                 ret = checkintf(ps, ifnum);
1093                 if (ret)
1094                         return ret;
1095         }
1096         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1097                 is_in = 1;
1098                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1099         } else {
1100                 is_in = 0;
1101                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1102         }
1103         if (!ep)
1104                 return -ENOENT;
1105         switch(uurb->type) {
1106         case USBDEVFS_URB_TYPE_CONTROL:
1107                 if (!usb_endpoint_xfer_control(&ep->desc))
1108                         return -EINVAL;
1109                 /* min 8 byte setup packet,
1110                  * max 8 byte setup plus an arbitrary data stage */
1111                 if (uurb->buffer_length < 8 ||
1112                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1113                         return -EINVAL;
1114                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1115                 if (!dr)
1116                         return -ENOMEM;
1117                 if (copy_from_user(dr, uurb->buffer, 8)) {
1118                         kfree(dr);
1119                         return -EFAULT;
1120                 }
1121                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1122                         kfree(dr);
1123                         return -EINVAL;
1124                 }
1125                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1126                                       le16_to_cpup(&dr->wIndex));
1127                 if (ret) {
1128                         kfree(dr);
1129                         return ret;
1130                 }
1131                 uurb->number_of_packets = 0;
1132                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1133                 uurb->buffer += 8;
1134                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1135                         is_in = 1;
1136                         uurb->endpoint |= USB_DIR_IN;
1137                 } else {
1138                         is_in = 0;
1139                         uurb->endpoint &= ~USB_DIR_IN;
1140                 }
1141                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1142                         "bRequest=%02x wValue=%04x "
1143                         "wIndex=%04x wLength=%04x\n",
1144                         dr->bRequestType, dr->bRequest,
1145                         __le16_to_cpup(&dr->wValue),
1146                         __le16_to_cpup(&dr->wIndex),
1147                         __le16_to_cpup(&dr->wLength));
1148                 break;
1149
1150         case USBDEVFS_URB_TYPE_BULK:
1151                 switch (usb_endpoint_type(&ep->desc)) {
1152                 case USB_ENDPOINT_XFER_CONTROL:
1153                 case USB_ENDPOINT_XFER_ISOC:
1154                         return -EINVAL;
1155                 case USB_ENDPOINT_XFER_INT:
1156                         /* allow single-shot interrupt transfers */
1157                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1158                         goto interrupt_urb;
1159                 }
1160                 uurb->number_of_packets = 0;
1161                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1162                         return -EINVAL;
1163                 break;
1164
1165         case USBDEVFS_URB_TYPE_INTERRUPT:
1166                 if (!usb_endpoint_xfer_int(&ep->desc))
1167                         return -EINVAL;
1168  interrupt_urb:
1169                 uurb->number_of_packets = 0;
1170                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1171                         return -EINVAL;
1172                 break;
1173
1174         case USBDEVFS_URB_TYPE_ISO:
1175                 /* arbitrary limit */
1176                 if (uurb->number_of_packets < 1 ||
1177                     uurb->number_of_packets > 128)
1178                         return -EINVAL;
1179                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1180                         return -EINVAL;
1181                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1182                                    uurb->number_of_packets;
1183                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1184                         return -ENOMEM;
1185                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1186                         kfree(isopkt);
1187                         return -EFAULT;
1188                 }
1189                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1190                         /* arbitrary limit,
1191                          * sufficient for USB 2.0 high-bandwidth iso */
1192                         if (isopkt[u].length > 8192) {
1193                                 kfree(isopkt);
1194                                 return -EINVAL;
1195                         }
1196                         totlen += isopkt[u].length;
1197                 }
1198                 /* 3072 * 64 microframes */
1199                 if (totlen > 196608) {
1200                         kfree(isopkt);
1201                         return -EINVAL;
1202                 }
1203                 uurb->buffer_length = totlen;
1204                 break;
1205
1206         default:
1207                 return -EINVAL;
1208         }
1209         if (uurb->buffer_length > 0 &&
1210                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1211                                 uurb->buffer, uurb->buffer_length)) {
1212                 kfree(isopkt);
1213                 kfree(dr);
1214                 return -EFAULT;
1215         }
1216         as = alloc_async(uurb->number_of_packets);
1217         if (!as) {
1218                 kfree(isopkt);
1219                 kfree(dr);
1220                 return -ENOMEM;
1221         }
1222         if (uurb->buffer_length > 0) {
1223                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1224                                 GFP_KERNEL);
1225                 if (!as->urb->transfer_buffer) {
1226                         kfree(isopkt);
1227                         kfree(dr);
1228                         free_async(as);
1229                         return -ENOMEM;
1230                 }
1231                 /* Isochronous input data may end up being discontiguous
1232                  * if some of the packets are short.  Clear the buffer so
1233                  * that the gaps don't leak kernel data to userspace.
1234                  */
1235                 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1236                         memset(as->urb->transfer_buffer, 0,
1237                                         uurb->buffer_length);
1238         }
1239         as->urb->dev = ps->dev;
1240         as->urb->pipe = (uurb->type << 30) |
1241                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1242                         (uurb->endpoint & USB_DIR_IN);
1243
1244         /* This tedious sequence is necessary because the URB_* flags
1245          * are internal to the kernel and subject to change, whereas
1246          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1247          */
1248         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1249         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1250                 u |= URB_ISO_ASAP;
1251         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1252                 u |= URB_SHORT_NOT_OK;
1253         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1254                 u |= URB_NO_FSBR;
1255         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1256                 u |= URB_ZERO_PACKET;
1257         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1258                 u |= URB_NO_INTERRUPT;
1259         as->urb->transfer_flags = u;
1260
1261         as->urb->transfer_buffer_length = uurb->buffer_length;
1262         as->urb->setup_packet = (unsigned char *)dr;
1263         as->urb->start_frame = uurb->start_frame;
1264         as->urb->number_of_packets = uurb->number_of_packets;
1265         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1266                         ps->dev->speed == USB_SPEED_HIGH)
1267                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1268         else
1269                 as->urb->interval = ep->desc.bInterval;
1270         as->urb->context = as;
1271         as->urb->complete = async_completed;
1272         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1273                 as->urb->iso_frame_desc[u].offset = totlen;
1274                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1275                 totlen += isopkt[u].length;
1276         }
1277         kfree(isopkt);
1278         as->ps = ps;
1279         as->userurb = arg;
1280         if (is_in && uurb->buffer_length > 0)
1281                 as->userbuffer = uurb->buffer;
1282         else
1283                 as->userbuffer = NULL;
1284         as->signr = uurb->signr;
1285         as->ifnum = ifnum;
1286         as->pid = get_pid(task_pid(current));
1287         as->uid = cred->uid;
1288         as->euid = cred->euid;
1289         security_task_getsecid(current, &as->secid);
1290         if (!is_in && uurb->buffer_length > 0) {
1291                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1292                                 uurb->buffer_length)) {
1293                         free_async(as);
1294                         return -EFAULT;
1295                 }
1296         }
1297         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1298                         as->urb->transfer_buffer_length, 0, SUBMIT,
1299                         is_in ? NULL : as->urb->transfer_buffer,
1300                                 uurb->buffer_length);
1301         async_newpending(as);
1302
1303         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1304                 spin_lock_irq(&ps->lock);
1305
1306                 /* Not exactly the endpoint address; the direction bit is
1307                  * shifted to the 0x10 position so that the value will be
1308                  * between 0 and 31.
1309                  */
1310                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1311                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1312                                 >> 3);
1313
1314                 /* If this bulk URB is the start of a new transfer, re-enable
1315                  * the endpoint.  Otherwise mark it as a continuation URB.
1316                  */
1317                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1318                         as->bulk_status = AS_CONTINUATION;
1319                 else
1320                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1321
1322                 /* Don't accept continuation URBs if the endpoint is
1323                  * disabled because of an earlier error.
1324                  */
1325                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1326                         ret = -EREMOTEIO;
1327                 else
1328                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1329                 spin_unlock_irq(&ps->lock);
1330         } else {
1331                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1332         }
1333
1334         if (ret) {
1335                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1336                            "usbfs: usb_submit_urb returned %d\n", ret);
1337                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1338                                 0, ret, COMPLETE, NULL, 0);
1339                 async_removepending(as);
1340                 free_async(as);
1341                 return ret;
1342         }
1343         return 0;
1344 }
1345
1346 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1347 {
1348         struct usbdevfs_urb uurb;
1349
1350         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1351                 return -EFAULT;
1352
1353         return proc_do_submiturb(ps, &uurb,
1354                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1355                         arg);
1356 }
1357
1358 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1359 {
1360         struct urb *urb;
1361         struct async *as;
1362         unsigned long flags;
1363
1364         spin_lock_irqsave(&ps->lock, flags);
1365         as = async_getpending(ps, arg);
1366         if (!as) {
1367                 spin_unlock_irqrestore(&ps->lock, flags);
1368                 return -EINVAL;
1369         }
1370
1371         urb = as->urb;
1372         usb_get_urb(urb);
1373         spin_unlock_irqrestore(&ps->lock, flags);
1374
1375         usb_kill_urb(urb);
1376         usb_put_urb(urb);
1377
1378         return 0;
1379 }
1380
1381 static int processcompl(struct async *as, void __user * __user *arg)
1382 {
1383         struct urb *urb = as->urb;
1384         struct usbdevfs_urb __user *userurb = as->userurb;
1385         void __user *addr = as->userurb;
1386         unsigned int i;
1387
1388         if (as->userbuffer && urb->actual_length) {
1389                 if (urb->number_of_packets > 0)         /* Isochronous */
1390                         i = urb->transfer_buffer_length;
1391                 else                                    /* Non-Isoc */
1392                         i = urb->actual_length;
1393                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1394                         goto err_out;
1395         }
1396         if (put_user(as->status, &userurb->status))
1397                 goto err_out;
1398         if (put_user(urb->actual_length, &userurb->actual_length))
1399                 goto err_out;
1400         if (put_user(urb->error_count, &userurb->error_count))
1401                 goto err_out;
1402
1403         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1404                 for (i = 0; i < urb->number_of_packets; i++) {
1405                         if (put_user(urb->iso_frame_desc[i].actual_length,
1406                                      &userurb->iso_frame_desc[i].actual_length))
1407                                 goto err_out;
1408                         if (put_user(urb->iso_frame_desc[i].status,
1409                                      &userurb->iso_frame_desc[i].status))
1410                                 goto err_out;
1411                 }
1412         }
1413
1414         if (put_user(addr, (void __user * __user *)arg))
1415                 return -EFAULT;
1416         return 0;
1417
1418 err_out:
1419         return -EFAULT;
1420 }
1421
1422 static struct async *reap_as(struct dev_state *ps)
1423 {
1424         DECLARE_WAITQUEUE(wait, current);
1425         struct async *as = NULL;
1426         struct usb_device *dev = ps->dev;
1427
1428         add_wait_queue(&ps->wait, &wait);
1429         for (;;) {
1430                 __set_current_state(TASK_INTERRUPTIBLE);
1431                 as = async_getcompleted(ps);
1432                 if (as)
1433                         break;
1434                 if (signal_pending(current))
1435                         break;
1436                 usb_unlock_device(dev);
1437                 schedule();
1438                 usb_lock_device(dev);
1439         }
1440         remove_wait_queue(&ps->wait, &wait);
1441         set_current_state(TASK_RUNNING);
1442         return as;
1443 }
1444
1445 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1446 {
1447         struct async *as = reap_as(ps);
1448         if (as) {
1449                 int retval = processcompl(as, (void __user * __user *)arg);
1450                 free_async(as);
1451                 return retval;
1452         }
1453         if (signal_pending(current))
1454                 return -EINTR;
1455         return -EIO;
1456 }
1457
1458 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1459 {
1460         int retval;
1461         struct async *as;
1462
1463         as = async_getcompleted(ps);
1464         retval = -EAGAIN;
1465         if (as) {
1466                 retval = processcompl(as, (void __user * __user *)arg);
1467                 free_async(as);
1468         }
1469         return retval;
1470 }
1471
1472 #ifdef CONFIG_COMPAT
1473 static int proc_control_compat(struct dev_state *ps,
1474                                 struct usbdevfs_ctrltransfer32 __user *p32)
1475 {
1476         struct usbdevfs_ctrltransfer __user *p;
1477         __u32 udata;
1478         p = compat_alloc_user_space(sizeof(*p));
1479         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1480             get_user(udata, &p32->data) ||
1481             put_user(compat_ptr(udata), &p->data))
1482                 return -EFAULT;
1483         return proc_control(ps, p);
1484 }
1485
1486 static int proc_bulk_compat(struct dev_state *ps,
1487                         struct usbdevfs_bulktransfer32 __user *p32)
1488 {
1489         struct usbdevfs_bulktransfer __user *p;
1490         compat_uint_t n;
1491         compat_caddr_t addr;
1492
1493         p = compat_alloc_user_space(sizeof(*p));
1494
1495         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1496             get_user(n, &p32->len) || put_user(n, &p->len) ||
1497             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1498             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1499                 return -EFAULT;
1500
1501         return proc_bulk(ps, p);
1502 }
1503 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1504 {
1505         struct usbdevfs_disconnectsignal32 ds;
1506
1507         if (copy_from_user(&ds, arg, sizeof(ds)))
1508                 return -EFAULT;
1509         ps->discsignr = ds.signr;
1510         ps->disccontext = compat_ptr(ds.context);
1511         return 0;
1512 }
1513
1514 static int get_urb32(struct usbdevfs_urb *kurb,
1515                      struct usbdevfs_urb32 __user *uurb)
1516 {
1517         __u32  uptr;
1518         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1519             __get_user(kurb->type, &uurb->type) ||
1520             __get_user(kurb->endpoint, &uurb->endpoint) ||
1521             __get_user(kurb->status, &uurb->status) ||
1522             __get_user(kurb->flags, &uurb->flags) ||
1523             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1524             __get_user(kurb->actual_length, &uurb->actual_length) ||
1525             __get_user(kurb->start_frame, &uurb->start_frame) ||
1526             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1527             __get_user(kurb->error_count, &uurb->error_count) ||
1528             __get_user(kurb->signr, &uurb->signr))
1529                 return -EFAULT;
1530
1531         if (__get_user(uptr, &uurb->buffer))
1532                 return -EFAULT;
1533         kurb->buffer = compat_ptr(uptr);
1534         if (__get_user(uptr, &uurb->usercontext))
1535                 return -EFAULT;
1536         kurb->usercontext = compat_ptr(uptr);
1537
1538         return 0;
1539 }
1540
1541 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1542 {
1543         struct usbdevfs_urb uurb;
1544
1545         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1546                 return -EFAULT;
1547
1548         return proc_do_submiturb(ps, &uurb,
1549                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1550                         arg);
1551 }
1552
1553 static int processcompl_compat(struct async *as, void __user * __user *arg)
1554 {
1555         struct urb *urb = as->urb;
1556         struct usbdevfs_urb32 __user *userurb = as->userurb;
1557         void __user *addr = as->userurb;
1558         unsigned int i;
1559
1560         if (as->userbuffer && urb->actual_length)
1561                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1562                                  urb->actual_length))
1563                         return -EFAULT;
1564         if (put_user(as->status, &userurb->status))
1565                 return -EFAULT;
1566         if (put_user(urb->actual_length, &userurb->actual_length))
1567                 return -EFAULT;
1568         if (put_user(urb->error_count, &userurb->error_count))
1569                 return -EFAULT;
1570
1571         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1572                 for (i = 0; i < urb->number_of_packets; i++) {
1573                         if (put_user(urb->iso_frame_desc[i].actual_length,
1574                                      &userurb->iso_frame_desc[i].actual_length))
1575                                 return -EFAULT;
1576                         if (put_user(urb->iso_frame_desc[i].status,
1577                                      &userurb->iso_frame_desc[i].status))
1578                                 return -EFAULT;
1579                 }
1580         }
1581
1582         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1583                 return -EFAULT;
1584         return 0;
1585 }
1586
1587 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1588 {
1589         struct async *as = reap_as(ps);
1590         if (as) {
1591                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1592                 free_async(as);
1593                 return retval;
1594         }
1595         if (signal_pending(current))
1596                 return -EINTR;
1597         return -EIO;
1598 }
1599
1600 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1601 {
1602         int retval;
1603         struct async *as;
1604
1605         retval = -EAGAIN;
1606         as = async_getcompleted(ps);
1607         if (as) {
1608                 retval = processcompl_compat(as, (void __user * __user *)arg);
1609                 free_async(as);
1610         }
1611         return retval;
1612 }
1613
1614
1615 #endif
1616
1617 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1618 {
1619         struct usbdevfs_disconnectsignal ds;
1620
1621         if (copy_from_user(&ds, arg, sizeof(ds)))
1622                 return -EFAULT;
1623         ps->discsignr = ds.signr;
1624         ps->disccontext = ds.context;
1625         return 0;
1626 }
1627
1628 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1629 {
1630         unsigned int ifnum;
1631
1632         if (get_user(ifnum, (unsigned int __user *)arg))
1633                 return -EFAULT;
1634         return claimintf(ps, ifnum);
1635 }
1636
1637 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1638 {
1639         unsigned int ifnum;
1640         int ret;
1641
1642         if (get_user(ifnum, (unsigned int __user *)arg))
1643                 return -EFAULT;
1644         if ((ret = releaseintf(ps, ifnum)) < 0)
1645                 return ret;
1646         destroy_async_on_interface (ps, ifnum);
1647         return 0;
1648 }
1649
1650 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1651 {
1652         int                     size;
1653         void                    *buf = NULL;
1654         int                     retval = 0;
1655         struct usb_interface    *intf = NULL;
1656         struct usb_driver       *driver = NULL;
1657
1658         /* alloc buffer */
1659         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1660                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1661                         return -ENOMEM;
1662                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1663                         if (copy_from_user(buf, ctl->data, size)) {
1664                                 kfree(buf);
1665                                 return -EFAULT;
1666                         }
1667                 } else {
1668                         memset(buf, 0, size);
1669                 }
1670         }
1671
1672         if (!connected(ps)) {
1673                 kfree(buf);
1674                 return -ENODEV;
1675         }
1676
1677         if (ps->dev->state != USB_STATE_CONFIGURED)
1678                 retval = -EHOSTUNREACH;
1679         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1680                 retval = -EINVAL;
1681         else switch (ctl->ioctl_code) {
1682
1683         /* disconnect kernel driver from interface */
1684         case USBDEVFS_DISCONNECT:
1685                 if (intf->dev.driver) {
1686                         driver = to_usb_driver(intf->dev.driver);
1687                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1688                         usb_driver_release_interface(driver, intf);
1689                 } else
1690                         retval = -ENODATA;
1691                 break;
1692
1693         /* let kernel drivers try to (re)bind to the interface */
1694         case USBDEVFS_CONNECT:
1695                 if (!intf->dev.driver)
1696                         retval = device_attach(&intf->dev);
1697                 else
1698                         retval = -EBUSY;
1699                 break;
1700
1701         /* talk directly to the interface's driver */
1702         default:
1703                 if (intf->dev.driver)
1704                         driver = to_usb_driver(intf->dev.driver);
1705                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1706                         retval = -ENOTTY;
1707                 } else {
1708                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1709                         if (retval == -ENOIOCTLCMD)
1710                                 retval = -ENOTTY;
1711                 }
1712         }
1713
1714         /* cleanup and return */
1715         if (retval >= 0
1716                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1717                         && size > 0
1718                         && copy_to_user(ctl->data, buf, size) != 0)
1719                 retval = -EFAULT;
1720
1721         kfree(buf);
1722         return retval;
1723 }
1724
1725 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1726 {
1727         struct usbdevfs_ioctl   ctrl;
1728
1729         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1730                 return -EFAULT;
1731         return proc_ioctl(ps, &ctrl);
1732 }
1733
1734 #ifdef CONFIG_COMPAT
1735 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1736 {
1737         struct usbdevfs_ioctl32 __user *uioc;
1738         struct usbdevfs_ioctl ctrl;
1739         u32 udata;
1740
1741         uioc = compat_ptr((long)arg);
1742         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1743             __get_user(ctrl.ifno, &uioc->ifno) ||
1744             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1745             __get_user(udata, &uioc->data))
1746                 return -EFAULT;
1747         ctrl.data = compat_ptr(udata);
1748
1749         return proc_ioctl(ps, &ctrl);
1750 }
1751 #endif
1752
1753 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1754 {
1755         unsigned portnum;
1756         int rc;
1757
1758         if (get_user(portnum, (unsigned __user *) arg))
1759                 return -EFAULT;
1760         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1761         if (rc == 0)
1762                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1763                         portnum, task_pid_nr(current), current->comm);
1764         return rc;
1765 }
1766
1767 static int proc_release_port(struct dev_state *ps, void __user *arg)
1768 {
1769         unsigned portnum;
1770
1771         if (get_user(portnum, (unsigned __user *) arg))
1772                 return -EFAULT;
1773         return usb_hub_release_port(ps->dev, portnum, ps);
1774 }
1775
1776 /*
1777  * NOTE:  All requests here that have interface numbers as parameters
1778  * are assuming that somehow the configuration has been prevented from
1779  * changing.  But there's no mechanism to ensure that...
1780  */
1781 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1782                                 void __user *p)
1783 {
1784         struct dev_state *ps = file->private_data;
1785         struct inode *inode = file->f_path.dentry->d_inode;
1786         struct usb_device *dev = ps->dev;
1787         int ret = -ENOTTY;
1788
1789         if (!(file->f_mode & FMODE_WRITE))
1790                 return -EPERM;
1791
1792         usb_lock_device(dev);
1793         if (!connected(ps)) {
1794                 usb_unlock_device(dev);
1795                 return -ENODEV;
1796         }
1797
1798         switch (cmd) {
1799         case USBDEVFS_CONTROL:
1800                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1801                 ret = proc_control(ps, p);
1802                 if (ret >= 0)
1803                         inode->i_mtime = CURRENT_TIME;
1804                 break;
1805
1806         case USBDEVFS_BULK:
1807                 snoop(&dev->dev, "%s: BULK\n", __func__);
1808                 ret = proc_bulk(ps, p);
1809                 if (ret >= 0)
1810                         inode->i_mtime = CURRENT_TIME;
1811                 break;
1812
1813         case USBDEVFS_RESETEP:
1814                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1815                 ret = proc_resetep(ps, p);
1816                 if (ret >= 0)
1817                         inode->i_mtime = CURRENT_TIME;
1818                 break;
1819
1820         case USBDEVFS_RESET:
1821                 snoop(&dev->dev, "%s: RESET\n", __func__);
1822                 ret = proc_resetdevice(ps);
1823                 break;
1824
1825         case USBDEVFS_CLEAR_HALT:
1826                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1827                 ret = proc_clearhalt(ps, p);
1828                 if (ret >= 0)
1829                         inode->i_mtime = CURRENT_TIME;
1830                 break;
1831
1832         case USBDEVFS_GETDRIVER:
1833                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1834                 ret = proc_getdriver(ps, p);
1835                 break;
1836
1837         case USBDEVFS_CONNECTINFO:
1838                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1839                 ret = proc_connectinfo(ps, p);
1840                 break;
1841
1842         case USBDEVFS_SETINTERFACE:
1843                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1844                 ret = proc_setintf(ps, p);
1845                 break;
1846
1847         case USBDEVFS_SETCONFIGURATION:
1848                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1849                 ret = proc_setconfig(ps, p);
1850                 break;
1851
1852         case USBDEVFS_SUBMITURB:
1853                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1854                 ret = proc_submiturb(ps, p);
1855                 if (ret >= 0)
1856                         inode->i_mtime = CURRENT_TIME;
1857                 break;
1858
1859 #ifdef CONFIG_COMPAT
1860         case USBDEVFS_CONTROL32:
1861                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1862                 ret = proc_control_compat(ps, p);
1863                 if (ret >= 0)
1864                         inode->i_mtime = CURRENT_TIME;
1865                 break;
1866
1867         case USBDEVFS_BULK32:
1868                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1869                 ret = proc_bulk_compat(ps, p);
1870                 if (ret >= 0)
1871                         inode->i_mtime = CURRENT_TIME;
1872                 break;
1873
1874         case USBDEVFS_DISCSIGNAL32:
1875                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1876                 ret = proc_disconnectsignal_compat(ps, p);
1877                 break;
1878
1879         case USBDEVFS_SUBMITURB32:
1880                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1881                 ret = proc_submiturb_compat(ps, p);
1882                 if (ret >= 0)
1883                         inode->i_mtime = CURRENT_TIME;
1884                 break;
1885
1886         case USBDEVFS_REAPURB32:
1887                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1888                 ret = proc_reapurb_compat(ps, p);
1889                 break;
1890
1891         case USBDEVFS_REAPURBNDELAY32:
1892                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1893                 ret = proc_reapurbnonblock_compat(ps, p);
1894                 break;
1895
1896         case USBDEVFS_IOCTL32:
1897                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1898                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1899                 break;
1900 #endif
1901
1902         case USBDEVFS_DISCARDURB:
1903                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1904                 ret = proc_unlinkurb(ps, p);
1905                 break;
1906
1907         case USBDEVFS_REAPURB:
1908                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1909                 ret = proc_reapurb(ps, p);
1910                 break;
1911
1912         case USBDEVFS_REAPURBNDELAY:
1913                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1914                 ret = proc_reapurbnonblock(ps, p);
1915                 break;
1916
1917         case USBDEVFS_DISCSIGNAL:
1918                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1919                 ret = proc_disconnectsignal(ps, p);
1920                 break;
1921
1922         case USBDEVFS_CLAIMINTERFACE:
1923                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1924                 ret = proc_claiminterface(ps, p);
1925                 break;
1926
1927         case USBDEVFS_RELEASEINTERFACE:
1928                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1929                 ret = proc_releaseinterface(ps, p);
1930                 break;
1931
1932         case USBDEVFS_IOCTL:
1933                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1934                 ret = proc_ioctl_default(ps, p);
1935                 break;
1936
1937         case USBDEVFS_CLAIM_PORT:
1938                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1939                 ret = proc_claim_port(ps, p);
1940                 break;
1941
1942         case USBDEVFS_RELEASE_PORT:
1943                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1944                 ret = proc_release_port(ps, p);
1945                 break;
1946         }
1947         usb_unlock_device(dev);
1948         if (ret >= 0)
1949                 inode->i_atime = CURRENT_TIME;
1950         return ret;
1951 }
1952
1953 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1954                         unsigned long arg)
1955 {
1956         int ret;
1957
1958         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1959
1960         return ret;
1961 }
1962
1963 #ifdef CONFIG_COMPAT
1964 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1965                         unsigned long arg)
1966 {
1967         int ret;
1968
1969         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1970
1971         return ret;
1972 }
1973 #endif
1974
1975 /* No kernel lock - fine */
1976 static unsigned int usbdev_poll(struct file *file,
1977                                 struct poll_table_struct *wait)
1978 {
1979         struct dev_state *ps = file->private_data;
1980         unsigned int mask = 0;
1981
1982         poll_wait(file, &ps->wait, wait);
1983         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1984                 mask |= POLLOUT | POLLWRNORM;
1985         if (!connected(ps))
1986                 mask |= POLLERR | POLLHUP;
1987         return mask;
1988 }
1989
1990 const struct file_operations usbdev_file_operations = {
1991         .owner =          THIS_MODULE,
1992         .llseek =         usbdev_lseek,
1993         .read =           usbdev_read,
1994         .poll =           usbdev_poll,
1995         .unlocked_ioctl = usbdev_ioctl,
1996 #ifdef CONFIG_COMPAT
1997         .compat_ioctl =   usbdev_compat_ioctl,
1998 #endif
1999         .open =           usbdev_open,
2000         .release =        usbdev_release,
2001 };
2002
2003 static void usbdev_remove(struct usb_device *udev)
2004 {
2005         struct dev_state *ps;
2006         struct siginfo sinfo;
2007
2008         while (!list_empty(&udev->filelist)) {
2009                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2010                 destroy_all_async(ps);
2011                 wake_up_all(&ps->wait);
2012                 list_del_init(&ps->list);
2013                 if (ps->discsignr) {
2014                         sinfo.si_signo = ps->discsignr;
2015                         sinfo.si_errno = EPIPE;
2016                         sinfo.si_code = SI_ASYNCIO;
2017                         sinfo.si_addr = ps->disccontext;
2018                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
2019                                         ps->disc_pid, ps->disc_uid,
2020                                         ps->disc_euid, ps->secid);
2021                 }
2022         }
2023 }
2024
2025 #ifdef CONFIG_USB_DEVICE_CLASS
2026 static struct class *usb_classdev_class;
2027
2028 static int usb_classdev_add(struct usb_device *dev)
2029 {
2030         struct device *cldev;
2031
2032         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
2033                               NULL, "usbdev%d.%d", dev->bus->busnum,
2034                               dev->devnum);
2035         if (IS_ERR(cldev))
2036                 return PTR_ERR(cldev);
2037         dev->usb_classdev = cldev;
2038         return 0;
2039 }
2040
2041 static void usb_classdev_remove(struct usb_device *dev)
2042 {
2043         if (dev->usb_classdev)
2044                 device_unregister(dev->usb_classdev);
2045 }
2046
2047 #else
2048 #define usb_classdev_add(dev)           0
2049 #define usb_classdev_remove(dev)        do {} while (0)
2050
2051 #endif
2052
2053 static int usbdev_notify(struct notifier_block *self,
2054                                unsigned long action, void *dev)
2055 {
2056         switch (action) {
2057         case USB_DEVICE_ADD:
2058                 if (usb_classdev_add(dev))
2059                         return NOTIFY_BAD;
2060                 break;
2061         case USB_DEVICE_REMOVE:
2062                 usb_classdev_remove(dev);
2063                 usbdev_remove(dev);
2064                 break;
2065         }
2066         return NOTIFY_OK;
2067 }
2068
2069 static struct notifier_block usbdev_nb = {
2070         .notifier_call =        usbdev_notify,
2071 };
2072
2073 static struct cdev usb_device_cdev;
2074
2075 int __init usb_devio_init(void)
2076 {
2077         int retval;
2078
2079         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2080                                         "usb_device");
2081         if (retval) {
2082                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2083                 goto out;
2084         }
2085         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2086         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2087         if (retval) {
2088                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2089                        USB_DEVICE_MAJOR);
2090                 goto error_cdev;
2091         }
2092 #ifdef CONFIG_USB_DEVICE_CLASS
2093         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2094         if (IS_ERR(usb_classdev_class)) {
2095                 printk(KERN_ERR "Unable to register usb_device class\n");
2096                 retval = PTR_ERR(usb_classdev_class);
2097                 cdev_del(&usb_device_cdev);
2098                 usb_classdev_class = NULL;
2099                 goto out;
2100         }
2101         /* devices of this class shadow the major:minor of their parent
2102          * device, so clear ->dev_kobj to prevent adding duplicate entries
2103          * to /sys/dev
2104          */
2105         usb_classdev_class->dev_kobj = NULL;
2106 #endif
2107         usb_register_notify(&usbdev_nb);
2108 out:
2109         return retval;
2110
2111 error_cdev:
2112         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2113         goto out;
2114 }
2115
2116 void usb_devio_cleanup(void)
2117 {
2118         usb_unregister_notify(&usbdev_nb);
2119 #ifdef CONFIG_USB_DEVICE_CLASS
2120         class_destroy(usb_classdev_class);
2121 #endif
2122         cdev_del(&usb_device_cdev);
2123         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2124 }