@@ -574,6 +574,8 @@ EXPORT_SYMBOL_GPL(__media_device_register);
* media_device_unregister - unregister a media device
* @mdev: The media device
*
+ * It is safe to call this function on an unregistered
+ * (but initialised) media device.
*/
void media_device_unregister(struct media_device *mdev)
{
@@ -582,6 +584,10 @@ void media_device_unregister(struct media_device *mdev)
struct media_link *link, *tmp_link;
struct media_interface *intf, *tmp_intf;
+ /* Check if mdev was ever registered at all */
+ if (!media_devnode_is_registered(&mdev->devnode))
+ return;
+
/* Remove interface links from the media device */
list_for_each_entry_safe(link, tmp_link, &mdev->links,
graph_obj.list) {