[PATCH RESEND]: error path in hiddev_read when interrupted

[Peter Waechtler <pwaechtler@xxxxxxx>]

hiddev_read: in case mutex_lock_interruptible will be interrupted 
remove the task from the wait queue 

Signed-off-by: Peter Waechtler <pwaechtler@xxxxxxx>

--- drivers/hid/usbhid/hiddev.c.orig    2011-04-19 21:29:52.000000000 +0200
+++ drivers/hid/usbhid/hiddev.c 2011-04-19 21:35:30.000000000 +0200
@@ -367,8 +367,10 @@
                                /* let O_NONBLOCK tasks run */
                                mutex_unlock(&list->thread_lock);
                                schedule();
-                               if (mutex_lock_interruptible(&list->thread_lock))
+                               if (mutex_lock_interruptible(&list->thread_lock)) {
+                                       finish_wait(&list->hiddev->wait, &wait);
                                        return -EINTR;
+                               }
                                set_current_state(TASK_INTERRUPTIBLE);
                        }
                        finish_wait(&list->hiddev->wait, &wait);

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