drm: Wake up all lock waiters when the master disappears.

Currently only one waiter is woken up, leaving other waiters
hanging waiting for the DRM lock.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/gpu/drm/drm_bufs.c

@@ -420,7 +420,7 @@ int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
 				dev->sigdata.lock = NULL;
 			master->lock.hw_lock = NULL;   /* SHM removed */
 			master->lock.file_priv = NULL;
-			wake_up_interruptible(&master->lock.lock_queue);
+			wake_up_interruptible_all(&master->lock.lock_queue);
 		}
 		break;
 	case _DRM_AGP:

drivers/gpu/drm/drm_stub.c

@@ -151,7 +151,7 @@ static void drm_master_destroy(struct kref *kref)
 			dev->sigdata.lock = NULL;
 		master->lock.hw_lock = NULL;
 		master->lock.file_priv = NULL;
-		wake_up_interruptible(&master->lock.lock_queue);
+		wake_up_interruptible_all(&master->lock.lock_queue);
 	}
 
 	drm_free(master, sizeof(*master), DRM_MEM_DRIVER);