From 3e2cd91ab92665148616a80dc0745c499d2746a7 Mon Sep 17 00:00:00 2001
From: Zefan Li <lizefan@huawei.com>
Date: Sat, 20 Sep 2014 14:35:43 +0800
Subject: [PATCH] cgroup: fix missing unlock in cgroup_release_agent()

The patch 971ff4935538: "cgroup: use a per-cgroup work for release
agent" from Sep 18, 2014, leads to the following static checker
warning:

	kernel/cgroup.c:5310 cgroup_release_agent()
	warn: 'mutex:&cgroup_mutex' is sometimes locked here and sometimes unlocked.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---
 kernel/cgroup.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 16e3a4f5c9dc..f873c4681316 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5291,7 +5291,10 @@ static void cgroup_release_agent(struct work_struct *work)
 
 	mutex_unlock(&cgroup_mutex);
 	call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
+	goto out_free;
 out:
+	mutex_unlock(&cgroup_mutex);
+out_free:
 	kfree(agentbuf);
 	kfree(pathbuf);
 }