linux-kernel - [PATCH RESEND] cgroups: fix incorrect using rcu_dereference() in cgroup_subsys

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Message-ID: <4D22D7BE.4070702@cn.fujitsu.com>
Date:	Tue, 04 Jan 2011 16:18:06 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH RESEND] cgroups: fix incorrect using rcu_dereference() in
 cgroup_subsys_state()

From: Li Zefan <lizf@...fujitsu.com>
Date: Mon, 25 Aug 2008 11:05:28 +0800
(Original) Subject: [PATCH] cgroup: fix wrong rcu_dereference()

It is tsk->cgroups which is protected by RCU, not ->subsys[subsys_id].

laijs: updated it(the surrounding code have been changed since these two years).

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index ed4ba11..a798814 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -535,10 +535,11 @@ static inline struct cgroup_subsys_state *cgroup_subsys_state(
  * cgroup_subsys::attach() methods.
  */
 #define task_subsys_state_check(task, subsys_id, __c)			\
-	rcu_dereference_check(task->cgroups->subsys[subsys_id],		\
+	rcu_dereference_check(task->cgroups,				\
 			      rcu_read_lock_held() ||			\
 			      lockdep_is_held(&task->alloc_lock) ||	\
-			      cgroup_lock_is_held() || (__c))
+			      cgroup_lock_is_held() ||			\
+			      (__c))->subsys[subsys_id]
 
 static inline struct cgroup_subsys_state *
 task_subsys_state(struct task_struct *task, int subsys_id)
--
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