From 0dfc1f4ceae86a0d09d880ab87625c86c61ed33c Mon Sep 17 00:00:00 2001
From: Zhihao Cheng <chengzhihao1@huawei.com>
Date: Fri, 11 Nov 2022 20:10:27 +0800
Subject: [PATCH] dm bufio: Fix missing decrement of no_sleep_enabled if
 dm_bufio_client_create failed
Git-commit: 0dfc1f4ceae86a0d09d880ab87625c86c61ed33c
Patch-mainline: v6.1-rc6
References: jsc#PED-2765

The 'no_sleep_enabled' should be decreased in error handling path
in dm_bufio_client_create() when the DM_BUFIO_CLIENT_NO_SLEEP flag
is set, otherwise static_branch_unlikely() will always return true
even if no dm_bufio_client instances have DM_BUFIO_CLIENT_NO_SLEEP
flag set.

Cc: stable@vger.kernel.org
Fixes: 3c1c875d0586 ("dm bufio: conditionally enable branching for DM_BUFIO_CLIENT_NO_SLEEP")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Coly Li <colyli@suse.de>

---
 drivers/md/dm-bufio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 9c5ef818ca36..bb786c39545e 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1858,6 +1858,8 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
 	dm_io_client_destroy(c->dm_io);
 bad_dm_io:
 	mutex_destroy(&c->lock);
+	if (c->no_sleep)
+		static_branch_dec(&no_sleep_enabled);
 	kfree(c);
 bad_client:
 	return ERR_PTR(r);
-- 
2.35.3