netdev - Re: bisected regression: 3c59x corrupts packets in 3.17-rc5

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Message-Id: <20140916.162923.605101746131407931.davem@davemloft.net>
Date:	Tue, 16 Sep 2014 16:29:23 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	nhorman@...driver.com
Cc:	mroos@...ux.ee, klassert@...hematik.tu-chemnitz.de,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: bisected regression: 3c59x corrupts packets in 3.17-rc5

From: Neil Horman <nhorman@...driver.com>
Date: Tue, 16 Sep 2014 06:17:04 -0400

> I'm guessing the above change has uncovered another bug,

Neil, read your patch carefully, I think it added the bug.

The ->page_offset of the frag gets applied two times.

skb_dma_map_frag() already takes frag->page_offset into consideration,
you then pass it in as the 'offset' argument and it then gets added to
itself to compute th final offset.
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