From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Date: Thu, 29 Jan 2009 22:25:10 +0000 (-0800)
Subject: cgroups: use hierarchy mutex in creation failure path
X-Git-Tag: firefly_0821_release~15729
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=baef99a08a2e23d9386b47e53fa5f0d44fc98f66;p=firefly-linux-kernel-4.4.55.git

cgroups: use hierarchy mutex in creation failure path

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

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Acked-by Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c29831076e7a..2ae7cb47dbfa 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2434,7 +2434,9 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 
  err_remove:
 
+	cgroup_lock_hierarchy(root);
 	list_del(&cgrp->sibling);
+	cgroup_unlock_hierarchy(root);
 	root->number_of_cgroups--;
 
  err_destroy: