linux-kernel - [PATCH] use hierarchy mutex in creation failure path

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Message-Id: <20090116121725.fff7dad9.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 16 Jan 2009 12:17:25 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	"menage@...gle.com" <menage@...gle.com>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: [PATCH] use hierarchy mutex in creation failure path

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Now, cgrp->sibling is handled under hierarchy mutex.
error route should do so, too.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

---
 kernel/cgroup.c |    2 ++
 1 file changed, 2 insertions(+)

Index: mmotm-2.6.29-Jan14/kernel/cgroup.c
===================================================================
--- mmotm-2.6.29-Jan14.orig/kernel/cgroup.c
+++ mmotm-2.6.29-Jan14/kernel/cgroup.c
@@ -2434,7 +2434,9 @@ static long cgroup_create(struct cgroup 
 
  err_remove:
 
+	cgroup_lock_hierarchy(root);
 	list_del(&cgrp->sibling);
+	cgroup_unlock_hierarchy(root);
 	root->number_of_cgroups--;
 
  err_destroy:

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