diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 4c01a7969981..4c5639e06d6b 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1382,7 +1382,8 @@ static void cached_dev_free(struct closure *cl)
 	 * The sb_bio is embedded in struct cached_dev, so we must
 	 * ensure no I/O is in progress.
 	 */
-	closure_sync(&dc->sb_write);
+	down(&dc->sb_write_mutex);
+	up(&dc->sb_write_mutex);
 
 	if (dc->sb_disk)
 		put_page(virt_to_page(dc->sb_disk));