diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 81f1cc5b34999578b06020875cb2cca30f12e3fb..b7d9d1b79ac2f72be465d30277191d6224a0cec6 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1151,9 +1151,6 @@ static void cancel_writeback_rate_update_dwork(struct cached_dev *dc)
 static void cached_dev_detach_finish(struct work_struct *w)
 {
 	struct cached_dev *dc = container_of(w, struct cached_dev, detach);
-	struct closure cl;
-
-	closure_init_stack(&cl);
 
 	BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags));
 	BUG_ON(refcount_read(&dc->count));
@@ -1167,12 +1164,6 @@ static void cached_dev_detach_finish(struct work_struct *w)
 		dc->writeback_thread = NULL;
 	}
 
-	memset(&dc->sb.set_uuid, 0, 16);
-	SET_BDEV_STATE(&dc->sb, BDEV_STATE_NONE);
-
-	bch_write_bdev_super(dc, &cl);
-	closure_sync(&cl);
-
 	mutex_lock(&bch_register_lock);
 
 	calc_cached_dev_sectors(dc->disk.c);
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 3c74996978dadef2642c3ac716abb4c46abda3c9..a129e4d2707c9c5bf3ee65caf89eb397f781996c 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -705,6 +705,15 @@ static int bch_writeback_thread(void *arg)
 			 * bch_cached_dev_detach().
 			 */
 			if (test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)) {
+				struct closure cl;
+
+				closure_init_stack(&cl);
+				memset(&dc->sb.set_uuid, 0, 16);
+				SET_BDEV_STATE(&dc->sb, BDEV_STATE_NONE);
+
+				bch_write_bdev_super(dc, &cl);
+				closure_sync(&cl);
+
 				up_write(&dc->writeback_lock);
 				break;
 			}