diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 2798804..fa99b94 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2258,8 +2258,8 @@
 	int ret = 0;
 
 	dout("%s called\n", __func__);
-	if (!device_is_registered(&rbd_dev->dev))
-		return 0;
+	if (WARN_ON(!device_is_registered(&rbd_dev->dev)))
+		return -EIO;
 
 	list_for_each_entry(snap, &rbd_dev->snaps, node) {
 		if (!rbd_snap_registered(snap)) {