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Date:	Wed, 4 Nov 2009 09:40:40 +0800
From:	Liu Aleaxander <>
To:	Paul Menage <>, Li Zefan <>,,
Subject: [PATCH] cgroup: Fixes the un-paired cgroup lock problem

From: Liu Aleaxander <>
Date: Wed, 4 Nov 2009 09:27:06 +0800
Subject: [PATCH] Fixes the un-paired cgroup lock problem

In cgroup_lock_live_group, it locks the cgroup by mutex_lock, while in the
cgroup_tasks_write, it unlock it by cgroup_unlock. Even though they are
equal, but I do think we should make it pair.

BTW, should we replace others with cgroup_lock and cgroup_unlock?
Since we already have a wrapper one and it's meaningful.

Signed-off-by: Liu Aleaxander <>
 kernel/cgroup.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 0249f4b..ee2274e 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1660,9 +1660,9 @@ static int cgroup_tasks_write(struct cgroup
*cgrp, struct cftype *cft, u64 pid)
 bool cgroup_lock_live_group(struct cgroup *cgrp)
-	mutex_lock(&cgroup_mutex);
+	cgroup_lock();
 	if (cgroup_is_removed(cgrp)) {
-		mutex_unlock(&cgroup_mutex);
+		cgroup_unlock();
 		return false;
 	return true;

Liu Aleaxander
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