This is a note to let you know that I've just added the patch titled
blkcg: Unlock blkcg_pol_mutex only once when cpd == NULL
to the 4.8-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:
blkcg-unlock-blkcg_pol_mutex-only-once-when-cpd-null.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bbb427e342495df1cda10051d0566388697499c0 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Date: Thu, 29 Sep 2016 08:33:30 -0700
Subject: blkcg: Unlock blkcg_pol_mutex only once when cpd == NULL
From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
commit bbb427e342495df1cda10051d0566388697499c0 upstream.
Unlocking a mutex twice is wrong. Hence modify blkcg_policy_register()
such that blkcg_pol_mutex is unlocked once if cpd == NULL. This patch
avoids that smatch reports the following error:
block/blk-cgroup.c:1378: blkcg_policy_register() error: double unlock 'mutex:&blkcg_pol_mutex'
Fixes: 06b285bd1125 ("blkcg: fix blkcg_policy_data allocation bug")
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/blk-cgroup.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1340,10 +1340,8 @@ int blkcg_policy_register(struct blkcg_p
struct blkcg_policy_data *cpd;
cpd = pol->cpd_alloc_fn(GFP_KERNEL);
- if (!cpd) {
- mutex_unlock(&blkcg_pol_mutex);
+ if (!cpd)
goto err_free_cpds;
- }
blkcg->cpd[pol->plid] = cpd;
cpd->blkcg = blkcg;
Patches currently in stable-queue which might be from bart.vanassche@xxxxxxxxxxx are
queue-4.8/ib-srp-fix-infinite-loop-when-fmr-sg.offset-0.patch
queue-4.8/dm-rq-take-request_queue-lock-while-clearing-queue_flag_stopped.patch
queue-4.8/ib-core-correctly-handle-rdma_rw_init_mrs-failure.patch
queue-4.8/dm-mark-request_queue-dead-before-destroying-the-dm-device.patch
queue-4.8/dm-mpath-check-if-path-s-request_queue-is-dying-in-activate_path.patch
queue-4.8/blkcg-unlock-blkcg_pol_mutex-only-once-when-cpd-null.patch
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