[WATCHDOG 37/57] sbc60xxwdt: clean up and switch to unlocked_ioctl
authorAlan Cox <alan@redhat.com>
Mon, 19 May 2008 13:08:11 +0000 (14:08 +0100)
committerWim Van Sebroeck <wim@iguana.be>
Sat, 21 Jun 2008 14:24:34 +0000 (14:24 +0000)
Review and switch to unlocked_ioctl

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
drivers/watchdog/sbc60xxwdt.c

index ef76f01625e7352634ad5f2b76a3d5665fe5f73a..e284a5d4fb1b116c295482a5269d58c952afa47f 100644 (file)
  *
  *           12/4 - 2000      [Initial revision]
  *           25/4 - 2000      Added /dev/watchdog support
- *           09/5 - 2001      [smj@oro.net] fixed fop_write to "return 1" on success
+ *           09/5 - 2001      [smj@oro.net] fixed fop_write to "return 1"
+ *                                     on success
  *           12/4 - 2002      [rob@osinvestor.com] eliminate fop_read
  *                            fix possible wdt_is_open race
  *                            add CONFIG_WATCHDOG_NOWAYOUT support
  *                            remove lock_kernel/unlock_kernel pairs
  *                            added KERN_* to printk's
  *                            got rid of extraneous comments
- *                            changed watchdog_info to correctly reflect what the driver offers
- *                            added WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS, WDIOC_SETTIMEOUT,
- *                            WDIOC_GETTIMEOUT, and WDIOC_SETOPTIONS ioctls
+ *                            changed watchdog_info to correctly reflect what
+ *                           the driver offers
+ *                           added WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS,
+ *                           WDIOC_SETTIMEOUT, WDIOC_GETTIMEOUT, and
+ *                           WDIOC_SETOPTIONS ioctls
  *           09/8 - 2003      [wim@iguana.be] cleanup of trailing spaces
  *                            use module_param
- *                            made timeout (the emulated heartbeat) a module_param
+ *                            made timeout (the emulated heartbeat) a
+ *                           module_param
  *                            made the keepalive ping an internal subroutine
  *                            made wdt_stop and wdt_start module params
  *                            added extra printk's for startup problems
@@ -56,9 +60,9 @@
 #include <linux/notifier.h>
 #include <linux/reboot.h>
 #include <linux/init.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
 
-#include <asm/io.h>
-#include <asm/uaccess.h>
 #include <asm/system.h>
 
 #define OUR_NAME "sbc60xxwdt"
@@ -94,13 +98,18 @@ MODULE_PARM_DESC(wdt_start, "SBC60xx WDT 'start' io port (default 0x443)");
  */
 
 #define WATCHDOG_TIMEOUT 30            /* 30 sec default timeout */
-static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds, multiplied by HZ to
+                                          get seconds to wait for a ping */
 module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+MODULE_PARM_DESC(timeout,
+       "Watchdog timeout in seconds. (1<=timeout<=3600, default="
+                               __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
 
 static int nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+MODULE_PARM_DESC(nowayout,
+       "Watchdog cannot be stopped once started (default="
+                               __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
 static void wdt_timer_ping(unsigned long);
 static DEFINE_TIMER(timer, wdt_timer_ping, 0, 0);
@@ -117,15 +126,14 @@ static void wdt_timer_ping(unsigned long data)
        /* If we got a heartbeat pulse within the WDT_US_INTERVAL
         * we agree to ping the WDT
         */
-       if(time_before(jiffies, next_heartbeat))
-       {
+       if (time_before(jiffies, next_heartbeat)) {
                /* Ping the WDT by reading from wdt_start */
                inb_p(wdt_start);
                /* Re-set the timer interval */
                mod_timer(&timer, jiffies + WDT_INTERVAL);
-       } else {
-               printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
-       }
+       } else
+               printk(KERN_WARNING PFX
+                       "Heartbeat lost! Will not ping the watchdog\n");
 }
 
 /*
@@ -159,40 +167,40 @@ static void wdt_keepalive(void)
  * /dev/watchdog handling
  */
 
-static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos)
+static ssize_t fop_write(struct file *file, const char __user *buf,
+                                               size_t count, loff_t *ppos)
 {
        /* See if we got the magic character 'V' and reload the timer */
-       if(count)
-       {
-               if (!nowayout)
-               {
+       if (count) {
+               if (!nowayout) {
                        size_t ofs;
 
-                       /* note: just in case someone wrote the magic character
-                        * five months ago... */
+                       /* note: just in case someone wrote the
+                          magic character five months ago... */
                        wdt_expect_close = 0;
 
-                       /* scan to see whether or not we got the magic character */
-                       for(ofs = 0; ofs != count; ofs++)
-                       {
+                       /* scan to see whether or not we got the
+                          magic character */
+                       for (ofs = 0; ofs != count; ofs++) {
                                char c;
-                               if(get_user(c, buf+ofs))
+                               if (get_user(c, buf+ofs))
                                        return -EFAULT;
-                               if(c == 'V')
+                               if (c == 'V')
                                        wdt_expect_close = 42;
                        }
                }
 
-               /* Well, anyhow someone wrote to us, we should return that favour */
+               /* Well, anyhow someone wrote to us, we should
+                  return that favour */
                wdt_keepalive();
        }
        return count;
 }
 
-static int fop_open(struct inode * inode, struct file * file)
+static int fop_open(struct inode *inode, struct file *file)
 {
        /* Just in case we're already talking to someone... */
-       if(test_and_set_bit(0, &wdt_is_open))
+       if (test_and_set_bit(0, &wdt_is_open))
                return -EBUSY;
 
        if (nowayout)
@@ -203,78 +211,72 @@ static int fop_open(struct inode * inode, struct file * file)
        return nonseekable_open(inode, file);
 }
 
-static int fop_close(struct inode * inode, struct file * file)
+static int fop_close(struct inode *inode, struct file *file)
 {
-       if(wdt_expect_close == 42)
+       if (wdt_expect_close == 42)
                wdt_turnoff();
        else {
                del_timer(&timer);
-               printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n");
+               printk(KERN_CRIT PFX
+                 "device file closed unexpectedly. Will not stop the WDT!\n");
        }
        clear_bit(0, &wdt_is_open);
        wdt_expect_close = 0;
        return 0;
 }
 
-static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-       unsigned long arg)
+static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
        void __user *argp = (void __user *)arg;
        int __user *p = argp;
-       static struct watchdog_info ident=
-       {
-               .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+       static const struct watchdog_info ident = {
+               .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
+                                                       WDIOF_MAGICCLOSE,
                .firmware_version = 1,
                .identity = "SBC60xx",
        };
 
-       switch(cmd)
+       switch (cmd) {
+       default:
+               return -ENOTTY;
+       case WDIOC_GETSUPPORT:
+               return copy_to_user(argp, &ident, sizeof(ident))? -EFAULT : 0;
+       case WDIOC_GETSTATUS:
+       case WDIOC_GETBOOTSTATUS:
+               return put_user(0, p);
+       case WDIOC_KEEPALIVE:
+               wdt_keepalive();
+               return 0;
+       case WDIOC_SETOPTIONS:
        {
-               default:
-                       return -ENOTTY;
-               case WDIOC_GETSUPPORT:
-                       return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
-               case WDIOC_GETSTATUS:
-               case WDIOC_GETBOOTSTATUS:
-                       return put_user(0, p);
-               case WDIOC_KEEPALIVE:
-                       wdt_keepalive();
-                       return 0;
-               case WDIOC_SETOPTIONS:
-               {
-                       int new_options, retval = -EINVAL;
-
-                       if(get_user(new_options, p))
-                               return -EFAULT;
-
-                       if(new_options & WDIOS_DISABLECARD) {
-                               wdt_turnoff();
-                               retval = 0;
-                       }
-
-                       if(new_options & WDIOS_ENABLECARD) {
-                               wdt_startup();
-                               retval = 0;
-                       }
-
-                       return retval;
+               int new_options, retval = -EINVAL;
+               if (get_user(new_options, p))
+                       return -EFAULT;
+               if (new_options & WDIOS_DISABLECARD) {
+                       wdt_turnoff();
+                       retval = 0;
                }
-               case WDIOC_SETTIMEOUT:
-               {
-                       int new_timeout;
-
-                       if(get_user(new_timeout, p))
-                               return -EFAULT;
-
-                       if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
-                               return -EINVAL;
-
-                       timeout = new_timeout;
-                       wdt_keepalive();
-                       /* Fall through */
+               if (new_options & WDIOS_ENABLECARD) {
+                       wdt_startup();
+                       retval = 0;
                }
-               case WDIOC_GETTIMEOUT:
-                       return put_user(timeout, p);
+               return retval;
+       }
+       case WDIOC_SETTIMEOUT:
+       {
+               int new_timeout;
+               if (get_user(new_timeout, p))
+                       return -EFAULT;
+               /* arbitrary upper limit */
+               if (new_timeout < 1 || new_timeout > 3600)
+                       return -EINVAL;
+
+               timeout = new_timeout;
+               wdt_keepalive();
+               /* Fall through */
+       }
+       case WDIOC_GETTIMEOUT:
+               return put_user(timeout, p);
        }
 }
 
@@ -284,7 +286,7 @@ static const struct file_operations wdt_fops = {
        .write          = fop_write,
        .open           = fop_open,
        .release        = fop_close,
-       .ioctl          = fop_ioctl,
+       .unlocked_ioctl = fop_ioctl,
 };
 
 static struct miscdevice wdt_miscdev = {
@@ -300,7 +302,7 @@ static struct miscdevice wdt_miscdev = {
 static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
        void *unused)
 {
-       if(code==SYS_DOWN || code==SYS_HALT)
+       if (code == SYS_DOWN || code == SYS_HALT)
                wdt_turnoff();
        return NOTIFY_DONE;
 }
@@ -310,8 +312,7 @@ static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
  *     turn the timebomb registers off.
  */
 
-static struct notifier_block wdt_notifier=
-{
+static struct notifier_block wdt_notifier = {
        .notifier_call = wdt_notify_sys,
 };
 
@@ -324,23 +325,22 @@ static void __exit sbc60xxwdt_unload(void)
 
        unregister_reboot_notifier(&wdt_notifier);
        if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))
-               release_region(wdt_stop,1);
-       release_region(wdt_start,1);
+               release_region(wdt_stop, 1);
+       release_region(wdt_start, 1);
 }
 
 static int __init sbc60xxwdt_init(void)
 {
        int rc = -EBUSY;
 
-       if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
-       {
+       if (timeout < 1 || timeout > 3600) { /* arbitrary upper limit */
                timeout = WATCHDOG_TIMEOUT;
-               printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
-                       timeout);
-       }
+               printk(KERN_INFO PFX
+                       "timeout value must be 1 <= x <= 3600, using %d\n",
+                                                               timeout);
+       }
 
-       if (!request_region(wdt_start, 1, "SBC 60XX WDT"))
-       {
+       if (!request_region(wdt_start, 1, "SBC 60XX WDT")) {
                printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
                        wdt_start);
                rc = -EIO;
@@ -348,33 +348,30 @@ static int __init sbc60xxwdt_init(void)
        }
 
        /* We cannot reserve 0x45 - the kernel already has! */
-       if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))
-       {
-               if (!request_region(wdt_stop, 1, "SBC 60XX WDT"))
-               {
-                       printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
-                               wdt_stop);
+       if (wdt_stop != 0x45 && wdt_stop != wdt_start) {
+               if (!request_region(wdt_stop, 1, "SBC 60XX WDT")) {
+                       printk(KERN_ERR PFX
+                               "I/O address 0x%04x already in use\n",
+                                                       wdt_stop);
                        rc = -EIO;
                        goto err_out_region1;
                }
        }
 
        rc = register_reboot_notifier(&wdt_notifier);
-       if (rc)
-       {
-               printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
-                       rc);
+       if (rc) {
+               printk(KERN_ERR PFX
+                       "cannot register reboot notifier (err=%d)\n", rc);
                goto err_out_region2;
        }
 
        rc = misc_register(&wdt_miscdev);
-       if (rc)
-       {
-               printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
-                       wdt_miscdev.minor, rc);
+       if (rc) {
+               printk(KERN_ERR PFX
+                       "cannot register miscdev on minor=%d (err=%d)\n",
+                                               wdt_miscdev.minor, rc);
                goto err_out_reboot;
        }
-
        printk(KERN_INFO PFX "WDT driver for 60XX single board computer initialised. timeout=%d sec (nowayout=%d)\n",
                timeout, nowayout);
 
@@ -383,10 +380,10 @@ static int __init sbc60xxwdt_init(void)
 err_out_reboot:
        unregister_reboot_notifier(&wdt_notifier);
 err_out_region2:
-       if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))
-               release_region(wdt_stop,1);
+       if (wdt_stop != 0x45 && wdt_stop != wdt_start)
+               release_region(wdt_stop, 1);
 err_out_region1:
-       release_region(wdt_start,1);
+       release_region(wdt_start, 1);
 err_out:
        return rc;
 }