--- x/sound/usb/midi.c
+++ y/sound/usb/midi.c
@@ -1530,6 +1530,7 @@ static void snd_usbmidi_free(struct snd_
 			snd_usbmidi_in_endpoint_delete(ep->in);
 	}
 	mutex_destroy(&umidi->mutex);
+	timer_delete_sync(&umidi->error_timer);
 	kfree(umidi);
 }