This is a note to let you know that I've just added the patch titled
dm bufio: Fix missing decrement of no_sleep_enabled if dm_bufio_client_create failed
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-bufio-fix-missing-decrement-of-no_sleep_enabled-if-dm_bufio_client_create-failed.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0dfc1f4ceae86a0d09d880ab87625c86c61ed33c Mon Sep 17 00:00:00 2001
From: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Date: Fri, 11 Nov 2022 20:10:27 +0800
Subject: dm bufio: Fix missing decrement of no_sleep_enabled if dm_bufio_client_create failed
From: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
commit 0dfc1f4ceae86a0d09d880ab87625c86c61ed33c upstream.
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@xxxxxxxxxxxxxxx
Fixes: 3c1c875d0586 ("dm bufio: conditionally enable branching for DM_BUFIO_CLIENT_NO_SLEEP")
Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
--
2.38.1
Patches currently in stable-queue which might be from chengzhihao1@xxxxxxxxxx are
queue-6.0/dm-bufio-fix-missing-decrement-of-no_sleep_enabled-if-dm_bufio_client_create-failed.patch
