netdev - [patch 1/2] cls_cgroup: remove unneeded cgroup

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Message-Id: <200905122106.n4CL6ndX009858@imap1.linux-foundation.org>
Date:	Tue, 12 May 2009 13:47:33 -0700
From:	akpm@...ux-foundation.org
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org,
	lizf@...fujitsu.com, lizf@...fujitsuc.com, menage@...gle.com
Subject: [patch 1/2] cls_cgroup: remove unneeded cgroup_lock

From: Li Zefan <lizf@...fujitsu.com>

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>
Acked-by: Paul Menage <menage@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 net/sched/cls_cgroup.c |    6 ------
 1 file changed, 6 deletions(-)

diff -puN net/sched/cls_cgroup.c~cls_cgroup-remove-unneeded-cgroup_lock net/sched/cls_cgroup.c
--- a/net/sched/cls_cgroup.c~cls_cgroup-remove-unneeded-cgroup_lock
+++ a/net/sched/cls_cgroup.c
@@ -62,13 +62,7 @@ static u64 read_classid(struct cgroup *c
 
 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;
 }
 
_
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