[PATCH] bcache: fix uninitialized closure object

[mingzhe.zou@easystack.cn]

From: Mingzhe Zou <zoumingzhe@qq.com>

In the previous patch(bcache: fix cached_dev.sb_bio use-after-free and crash),
we adopted a simple modification suggestion from AI to fix the use-after-free.

But in actual testing, we found an extreme case where the device is stopped
before calling bch_write_bdev_super().

At this point, struct closure sb_write has not been initialized yet.

For this patch, we ensure that sb_bio has been completed via sb_write_mutex.

Signed-off-by: Mingzhe Zou <mingzhe.zou@easystack.cn>
---
 drivers/md/bcache/super.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 6627a381f65a..97d9adb0bf96 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1378,7 +1378,8 @@ static CLOSURE_CALLBACK(cached_dev_free)
 	 * 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)
 		folio_put(virt_to_folio(dc->sb_disk));
-- 
2.34.1