usb: gadget: clean the ep in autoconf before returning it.

Since commit 72c973dd aka ("usb: gadget: add usb_endpoint_descriptor to
struct usb_ep) the descriptor is part of the ep. Most gadgets like
g_zero or masstorage call config_ep_by_speed() to grab an available
endpoint which may be used for FS/HS/SS bulk/iso/intr and in a second
they assign the proper descriptor by calling config_ep_by_speed(). This
is good so far. A few of them like ncm call config_ep_by_speed() only if
ep->desc not assigned earlier. That means ep->desc is never assigned if
the endpoint was used by another gadget before it was removed.

Some of those gadgets also assign ep->driver_data to NULL on reset or
ep_disable part _but_ keep a reference to this endpoint. At ep_enable
time they assign driver_data to their private data. This probably needs
a clean up of its own.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
index 753aa0683ac12c483ed34e23543063182bc15536..f59f7e367b5ae0e6082404facc164b4c6c315521 100644 (file)
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c
@@ -275,24 +275,24 @@ struct usb_ep *usb_ep_autoconfig_ss(
                /* ep-e, ep-f are PIO with only 64 byte fifos */
                ep = find_ep (gadget, "ep-e");
                if (ep && ep_matches(gadget, ep, desc, ep_comp))
-                       return ep;
+                       goto found_ep;
                ep = find_ep (gadget, "ep-f");
                if (ep && ep_matches(gadget, ep, desc, ep_comp))
-                       return ep;
+                       goto found_ep;
 
        } else if (gadget_is_goku (gadget)) {
                if (USB_ENDPOINT_XFER_INT == type) {
                        /* single buffering is enough */
                        ep = find_ep(gadget, "ep3-bulk");
                        if (ep && ep_matches(gadget, ep, desc, ep_comp))
-                               return ep;
+                               goto found_ep;
                } else if (USB_ENDPOINT_XFER_BULK == type
                                && (USB_DIR_IN & desc->bEndpointAddress)) {
                        /* DMA may be available */
                        ep = find_ep(gadget, "ep2-bulk");
                        if (ep && ep_matches(gadget, ep, desc,
                                              ep_comp))
-                               return ep;
+                               goto found_ep;
                }
 
 #ifdef CONFIG_BLACKFIN
@@ -311,18 +311,22 @@ struct usb_ep *usb_ep_autoconfig_ss(
                } else
                        ep = NULL;
                if (ep && ep_matches(gadget, ep, desc, ep_comp))
-                       return ep;
+                       goto found_ep;
 #endif
        }
 
        /* Second, look at endpoints until an unclaimed one looks usable */
        list_for_each_entry (ep, &gadget->ep_list, ep_list) {
                if (ep_matches(gadget, ep, desc, ep_comp))
-                       return ep;
+                       goto found_ep;
        }
 
        /* Fail */
        return NULL;
+found_ep:
+       ep->desc = NULL;
+       ep->comp_desc = NULL;
+       return ep;
 }
 
 /**