diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8a2656cf7127d56bb166dfbc64b02d3be92e910a..409ec5ffd28d32fb84c81c736d3b87b611189e6b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7306,8 +7306,11 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
 			err = -EBUSY;
 			goto out;
 		}
-		WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags));
-		set_bit(MD_CLOSING, &mddev->flags);
+		if (test_and_set_bit(MD_CLOSING, &mddev->flags)) {
+			mutex_unlock(&mddev->open_mutex);
+			err = -EBUSY;
+			goto out;
+		}
 		did_set_md_closing = true;
 		mutex_unlock(&mddev->open_mutex);
 		sync_blockdev(bdev);