linux-kernel - Re: deadlocks if use htb

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Message-ID: <20090115090650.GF4190@ff.dom.local>
Date:	Thu, 15 Jan 2009 09:06:50 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Denys Fedoryschenko <denys@...p.net.lb>
Cc:	Badalian Vyacheslav <slavon@...telecom.ru>,
	Chris Caputo <ccaputo@....net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: deadlocks if use htb

On Thu, Jan 15, 2009 at 11:01:14AM +0200, Denys Fedoryschenko wrote:
...
> Jarek, can you give me exact name of patch or link to it?
> I will test it on production.
> And i am interested in searching, what is a problem.

If there is nothing better I could recommend the patch below for
-stable (2.6.28), when it's tested.

Thanks,
Jarek P.
---

diff -Nurp a2.6.27.7/net/sched/sch_htb.c b2.6.27.7/net/sched/sch_htb.c
--- a2.6.27.7/net/sched/sch_htb.c	2008-12-11 08:16:16.000000000 +0000
+++ b2.6.27.7/net/sched/sch_htb.c	2008-12-15 10:44:32.000000000 +0000
@@ -924,6 +924,7 @@ static struct sk_buff *htb_dequeue(struc
 		}
 	}
 	sch->qstats.overlimits++;
+	qdisc_watchdog_cancel(&q->watchdog);
 	qdisc_watchdog_schedule(&q->watchdog, next_event);
 fin:
 	return skb;
--
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