From: Salman Qazi <sqazi@google.com>
Date: Thu, 14 Jun 2012 21:55:30 +0000 (-0700)
Subject: cgroups: Account for CSS_DEACT_BIAS in __css_put
X-Git-Tag: v3.5-rc4~13^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8e3bbf42c6d73881956863cc3305456afe2bc4ea;p=pandora-kernel.git

cgroups: Account for CSS_DEACT_BIAS in __css_put

When we fixed the race between atomic_dec and css_refcnt, we missed
the fact that css_refcnt internally subtracts CSS_DEACT_BIAS to get
the actual reference count.  This can potentially cause a refcount leak
if __css_put races with cgroup_clear_css_refs.

Signed-off-by: Salman Qazi <sqazi@google.com>
Acked-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

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