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cgroup: restore the call to eventfd->poll() 

I mistakenly removed the call to eventfd->poll() while I was actually
intending to remove the return value...

Calling evenfd->poll() will hook cgroup_event_wake() to the poll
waitqueue, which will be called to unregister eventfd when rmdir a
cgroup or close eventfd.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Li Zefan 2013-04-26 11:58:03 -07:00 committed by Tejun Heo
parent cc20e01cd6
commit 7ef70e4873
1 changed files with 2 additions and 0 deletions
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2
kernel/cgroup.c
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@ -3882,6 +3882,8 @@ static int cgroup_write_event_control(struct cgroup *cgrp, struct cftype *cft,
if (ret)
goto fail;
efile->f_op->poll(efile, &event->pt);
/*
* Events should be removed after rmdir of cgroup directory, but before
* destroying subsystem state objects. Let's take reference to cgroup