netdev - Re: [PATCH] net_sched: prio: use qdisc_dequeue

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Date:	Tue, 09 Aug 2011 21:52:38 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fw@...len.de
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH] net_sched: prio: use qdisc_dequeue_peeked

From: Florian Westphal <fw@...len.de>
Date: Tue,  9 Aug 2011 14:04:43 +0200

> commit 07bd8df5df4369487812bf85a237322ff3569b77
> (sch_sfq: fix peek() implementation) changed sfq to use generic
> peek helper.
> 
> This makes HFSC complain about a non-work-conserving child qdisc, if
> prio with sfq child is used within hfsc:
> 
> hfsc peeks into prio qdisc, which will then peek into sfq.
> returned skb is stashed in sch->gso_skb.
> 
> Next, hfsc tries to dequeue from prio, but prio will call sfq dequeue
> directly, which may return NULL instead of previously peeked-at skb.
> 
> Have prio call qdisc_dequeue_peeked, so sfq->dequeue() is
> not called in this case.
> 
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Florian Westphal <fw@...len.de>

Applied and queued up for -stable, thanks!
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