linux-kernel - Re: linux-next 20141208 - net/sched/sch_fq

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Message-ID: <CANn89i+fLqXT2J-98UhC8x9sZCF1kh-twvZ2FXEAgOgKS5-oYg@mail.gmail.com>
Date:	Tue, 9 Dec 2014 11:00:29 -0800
From:	Eric Dumazet <edumazet@...gle.com>
To:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Cc:	John Fastabend <john.r.fastabend@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: linux-next 20141208 - net/sched/sch_fq_codel.c:97 suspicious RCU

On Tue, Dec 9, 2014 at 10:54 AM,  <Valdis.Kletnieks@...edu> wrote:

> You want a patch, or you got it already?
>

If you could submit it formally, this would be great , thanks !

diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index b9ca32ebc1de..1e52decb7b59 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -94,7 +94,7 @@ static unsigned int fq_codel_classify(struct sk_buff
*skb, struct Qdisc *sch,
            TC_H_MIN(skb->priority) <= q->flows_cnt)
                return TC_H_MIN(skb->priority);

-       filter = rcu_dereference(q->filter_list);
+filter = rcu_dereference_bh(q->filter_list);
        if (!filter)
                return fq_codel_hash(q, skb) + 1;
--
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