linux-kernel - Re: [PATCH] cls_cgroup: read classid atomically in classifier

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Date:	Thu, 21 May 2009 15:22:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jpirko@...hat.com
Cc:	menage@...gle.com, lizf@...fujitsu.com, akpm@...ux-foundation.org,
	tgraf@...g.ch, linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] cls_cgroup: read classid atomically in classifier

From: Jiri Pirko <jpirko@...hat.com>
Date: Thu, 21 May 2009 21:44:48 +0200

> Thu, May 21, 2009 at 08:31:26PM CEST, menage@...gle.com wrote:
>>cls_cgroup: read classid atomically in classifier
>>
>>Avoid reading the unsynchronized value cs->classid multiple times,
>>since it could change concurrently from non-zero to zero; this would
>>result in the classifier returning a positive result with a bogus
>>(zero) classid.
>>
>>Signed-off-by: Paul Menage <menage@...gle.com>
>>Reviewed-by: Li Zefan <lizf@...fujitsu.com>
>>
>>---
>>
>>Resending to cc netdev@...r.kernel.org as requested by DaveM
>>
>> net/sched/cls_cgroup.c |   22 +++++++++++-----------
>> 1 files changed, 11 insertions(+), 11 deletions(-)
>>
>>diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
>>index 1ab4542..4ece6e0 100644
>>--- a/net/sched/cls_cgroup.c
>>+++ b/net/sched/cls_cgroup.c
>>@@ -98,8 +98,7 @@ static int cls_cgroup_classify(struct sk_buff *skb, struct tcf_proto *tp,
>> 			       struct tcf_result *res)
>> {
>> 	struct cls_cgroup_head *head = tp->root;
>>-	struct cgroup_cls_state *cs;
>>-	int ret = 0;
>>+        u32 classid;
>   ^^^^^^^^ How about using TAB instead?

Agreed, please use proper formatting.
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