netdev - [PATCH v1 3/5] cgroup: net_cls: Remove rcu_read

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Date:	Thu, 25 Oct 2012 16:16:57 +0200
From:	Daniel Wagner <wagi@...om.org>
To:	netdev@...r.kernel.org, cgroups@...r.kernel.org
Cc:	Daniel Wagner <daniel.wagner@...-carit.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Glauber Costa <glommer@...allels.com>,
	Li Zefan <lizefan@...wei.com>,
	Neil Horman <nhorman@...driver.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH v1 3/5] cgroup: net_cls: Remove rcu_read_lock/unlock

From: Daniel Wagner <daniel.wagner@...-carit.de>

As Eric pointed out:
"Hey task_cls_classid() has its own rcu protection since commit
3fb5a991916091a908d (cls_cgroup: Fix rcu lockdep warning)

So we can safely revert Paul commit (1144182a8757f2a1)
(We no longer need rcu_read_lock/unlock here)"

Signed-off-by: Daniel Wagner <daniel.wagner@...-carit.de>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Glauber Costa <glommer@...allels.com>
Cc: Li Zefan <lizefan@...wei.com>
Cc: Neil Horman <nhorman@...driver.com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: netdev@...r.kernel.org
Cc: cgroups@...r.kernel.org
---
 net/core/sock.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index c49412c..9fedbbf 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1221,9 +1221,7 @@ void sock_update_classid(struct sock *sk)
 {
 	u32 classid;
 
-	rcu_read_lock();  /* doing current task, which cannot vanish. */
 	classid = task_cls_classid(current);
-	rcu_read_unlock();
 	if (classid != sk->sk_classid)
 		sk->sk_classid = classid;
 }
-- 
1.8.0.rc0

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