netdev - Re: [PATCH,RFC] gianfar: fix BUG under load after introduction of skb recycling

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Message-Id: <20090525.004258.82412594.davem@davemloft.net>
Date:	Mon, 25 May 2009 00:42:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mike@...loops.com
Cc:	buytenh@...tstofly.org, afleming@...escale.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, rjw@...k.pl
Subject: Re: [PATCH,RFC] gianfar: fix BUG under load after introduction of
 skb recycling

From: Michael Guntsche <mike@...loops.com>
Date: Sun, 24 May 2009 17:32:05 +0200

> 
> On May 23, 2009, at 13:51, Lennert Buytenhek wrote:
> 
>> Since commit 0fd56bb5be6455d0d42241e65aed057244665e5e ("gianfar:
>> Add support for skb recycling"), gianfar puts skbuffs that are in
>> the rx ring back onto the recycle list as-is in case there was a
>> receive error, but this breaks the following invariant: that all
>> skbuffs on the recycle list have skb->data = skb->head + NET_SKB_PAD.
>>
>>
>> Michael, can you re-test with this version of the patch?
>> Andy, can you see if this is OK with you?
> 
> Hi, I have been running tests with this patch for the last 6 hours and
> had no panics so far.
> So it fixes the issues I am seeing as well.

Since it's now tested, I am applying this to net-2.6 to expedite it's
inclusion into 2.6.30

Thanks.
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