From: Li Zefan <lizefan@huawei.com>
Date: Fri, 26 Apr 2013 18:58:03 +0000 (-0700)
Subject: cgroup: restore the call to eventfd->poll()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7ef70e48735e17d2be5c8e8f85052842b16b923a;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

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>
---

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index bd4de465d5a9..3f14a1310d23 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