netdev - Re: [PATCH net-2.6] net_sched: always clone skbs

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Message-ID: <20101220232020.GB2052@del.dom.local>
Date:	Tue, 21 Dec 2010 00:20:20 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	Jamal Hadi Salim <hadi@...erus.ca>,
	Pawel Staszewski <pstaszewski@...are.pl>
Subject: Re: [PATCH net-2.6] net_sched: always clone skbs

On Mon, Dec 20, 2010 at 10:35:30PM +0800, Changli Gao wrote:
> Pawel reported a panic related to handling shared skbs in ixgbe
> incorrectly. So we need to revert my previous patch to work around
> this bug. Instead of reverting the patch completely, I just revert
> the essential lines, so we can add the previous optimization
> back more easily in future.
> 
>     commit 3511c9132f8b1e1b5634e41a3331c44b0c13be70
>     Author: Changli Gao <xiaosuo@...il.com>
>     Date:   Sat Oct 16 13:04:08 2010 +0000
>     
>         net_sched: remove the unused parameter of qdisc_create_dflt()
> 

Isn't there some mistake in the commit number? IMHO this changelog is
mostly wrong. The bug happens outside of ixgbe, probably in
dev_hard_start_xmit() ->  __skb_linearize(), and even if not, it can,
without any driver's fault. The only question is why it didn't triger
with 2.6.36.

Jarek P.
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