netdev - Re: [net] ixgbe: fix possible null buffer error

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Message-Id: <20110921.021609.1547370353809586562.davem@davemloft.net>
Date:	Wed, 21 Sep 2011 02:16:09 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	jesse.brandeburg@...el.com, netdev@...r.kernel.org,
	gospo@...hat.com, alexander.h.duyck@...el.com, stable@...nel.org
Subject: Re: [net] ixgbe: fix possible null buffer error

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Tue, 20 Sep 2011 18:13:03 -0700

> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
> 
> It seems that at least one PPC machine would occasionally give a (valid) 0 as
> the return value from dma_map, this caused the ixgbe code to not work
> correctly.  A fix is pending in the PPC tree to not return 0 from dma map, but
> we can also fix the driver to make sure we don't mess up in other arches as
> well.
> 
> This patch is applicable to all current stable kernels.
> 
> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=683611
> 
> Reported-by: Neil Horman <nhorman@...hat.com>
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> CC: Alexander Duyck <alexander.h.duyck@...el.com>
> CC: stable@...nel.org
> Tested-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
> Tested-by: Phil Schmitt <phillip.j.schmitt@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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