netdev - Re: [PATCH v2 2/3] net_sched: Add accessor function for packet length for qdiscs

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Date:	Fri, 25 Jul 2008 10:57:48 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Jussi Kivilinna <jussi.kivilinna@...et.fi>
Cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v2 2/3] net_sched: Add accessor function for packet
	length for   qdiscs

On 20-07-2008 01:35, Jussi Kivilinna wrote:
> Signed-off-by: Jussi Kivilinna <jussi.kivilinna@...et.fi>
...
> diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
> index 1afe3ee..f1d2f8e 100644
> --- a/net/sched/sch_cbq.c
> +++ b/net/sched/sch_cbq.c
> @@ -370,7 +370,6 @@ static int
>  cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
>  {
>  	struct cbq_sched_data *q = qdisc_priv(sch);
> -	int len = skb->len;
>  	int uninitialized_var(ret);
>  	struct cbq_class *cl = cbq_classify(skb, sch, &ret);
>  
> @@ -391,7 +390,7 @@ cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch)
>  	if (ret == NET_XMIT_SUCCESS) {
>  		sch->q.qlen++;
>  		sch->bstats.packets++;
> -		sch->bstats.bytes+=len;
> +		sch->bstats.bytes += qdisc_pkt_len(skb);

Alas I didn't manage to read this earlier, but this type of changes
here and elsewhere in this patch looks wrong to me: we shouldn't
use skb pointer after ->enqueue().

Jarek P.
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