netdev - [PATCH] cls_cgroup: remove unneeded cgroup

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Message-ID: <49B869B2.1020303@cn.fujitsu.com>
Date:	Thu, 12 Mar 2009 09:47:30 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	Paul Menage <menage@...gle.com>, Thomas Graf <tgraf@...g.ch>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] cls_cgroup: remove unneeded cgroup_lock

We can remove this lock here, since we are in cgroup write handler
and thus the cgrp is guaranteed to be valid, and no lock is needed
when writing a u32 variable.

Signed-off-by: Li Zefan <lizf@...fujitsuc.com>
---
 net/sched/cls_cgroup.c |    6 ------
 1 files changed, 0 insertions(+), 6 deletions(-)

diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 91a3db4..1ab4542 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -62,13 +62,7 @@ static u64 read_classid(struct cgroup *cgrp, struct cftype *cft)
 
 static int write_classid(struct cgroup *cgrp, struct cftype *cft, u64 value)
 {
-	if (!cgroup_lock_live_group(cgrp))
-		return -ENODEV;
-
 	cgrp_cls_state(cgrp)->classid = (u32) value;
-
-	cgroup_unlock();
-
 	return 0;
 }
 
-- 
1.5.4.rc3

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