On Thu, Sep 29, 2016 at 08:33:30AM -0700, Bart Van Assche wrote:
> 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>
> Cc: <stable@xxxxxxxxxxxxxxx>
Applied to cgroup/for-4.9. We're right before v4.8 release and it's
extremely unlikely to trigger (it has never been actually reported).
Thanks.
--
tejun
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