netdev - Re: [PATCH] ibmveth: Fix alignment of rx queue bug

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Message-Id: <20120905.174543.111505618029273524.davem@davemloft.net>
Date:	Wed, 05 Sep 2012 17:45:43 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	santil@...ux.vnet.ibm.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ibmveth: Fix alignment of rx queue bug

From: Santiago Leon <santil@...ux.vnet.ibm.com>
Date: Tue, 04 Sep 2012 19:41:37 -0500

> This patch fixes a bug found by Nish Aravamudan 
> (https://lkml.org/lkml/2012/5/15/220) where the driver is not following
> the spec (it is not aligning the rx buffer on a 16-byte boundary) and the
> hypervisor aborts the registration, making the device unusable. 
> 
> The fix follows BenH's recommendation (https://lkml.org/lkml/2012/7/20/461)
> to replace the kmalloc+map for a single call to dma_alloc_coherent()
> because that function always aligns to a 16-byte boundary.
> 
> The stable trees will run into this bug whenever the rx buffer kmalloc call
> returns something not aligned on a 16-byte boundary.
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Santiago Leon <santil@...ux.vnet.ibm.com>

Applied, thanks.
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