[PATCH cgroup/for-3.12 2/2] cgroup: fix cgroup_write_event_control()

[Tejun Heo]

On Mon, Aug 19, 2013 at 10:41:55AM +0800, Li Zefan wrote:
> On 2013/8/15 23:43, Tejun Heo wrote:
> >>From ced043264c9c3f03ab3c992af17461db50421dd8 Mon Sep 17 00:00:00 2001
> > From: Tejun Heo <tj at kernel.org>
> > Date: Thu, 15 Aug 2013 11:37:54 -0400
> > 
> > 81eeaf0411 ("cgroup: make cftype->[un]register_event() deal with
> > cgroup_subsys_state inst ead of cgroup") updated the cftype event
> > methods to take @css (cgroup_subsys_state) instead of @cgroup;
> > however, it incorrectly used @css passed to
> > cgroup_write_event_control(), which the dummy_css for the cgroup as
> > the file is a cgroup core file.  This leads to oops on event
> > registration.
> > 
> > Fix it by using the css matching the event target file.  Note that
> > cgroup_write_event_control() now disallows cgroup core files from
> > being event sources.  This is for simplicity and doesn't matter as
> > cgroup_event will be moved and made specific to memcg.
> > 
> > Signed-off-by: Tejun Heo <tj at kernel.org>
> 
> Acked-by: Li Zefan <lizefan at huawei.com>

Applied to cgroup/for-3.12.  Thanks.

-- 
tejun