diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 102d79575895..9dcf8bb60c4e 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -952,6 +952,9 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
 	error = -EBUSY;
 	if (lo->lo_state != Lo_unbound)
 		goto out_unlock;
+	/* Avoid changing loop device under an exclusive opener... */
+	if (!(mode & FMODE_EXCL) && bdev->bd_holders > 0)
+		goto out_unlock;
 
 	error = loop_validate_file(file, bdev);
 	if (error)