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

From: Li Zefan
Date: Thu Apr 25 2013 - 22:55:08 EST

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@xxxxxxxxxx>
kernel/cgroup.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a45aa12..4b0f2ef 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -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

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