linux-kernel - Re: [2.6.22.y][PATCH] atl1: disable broken 64-bit DMA

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Message-ID: <474AF9D9.8070209@redhat.com>
Date:	Mon, 26 Nov 2007 11:52:41 -0500
From:	Chris Snook <csnook@...hat.com>
To:	Jay Cliburn <jacliburn@...lsouth.net>
CC:	greg@...ah.com, chrisw@...s-sol.org, kronos.it@...il.com,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [2.6.22.y][PATCH] atl1: disable broken 64-bit DMA

Jay Cliburn wrote:
> atl1: disable broken 64-bit DMA
> 
> [ Upstream commit: 5f08e46b621a769e52a9545a23ab1d5fb2aec1d4 ]
> 
> The L1 network chip can DMA to 64-bit addresses, but multiple descriptor
> rings share a single register for the high 32 bits of their address, so
> only a single, aligned, 4 GB physical address range can be used at a time.
> As a result, we need to confine the driver to a 32-bit DMA mask, otherwise
> we see occasional data corruption errors in systems containing 4 or more
> gigabytes of RAM.
> 
> Signed-off-by: Jay Cliburn <jacliburn@...lsouth.net>
> Cc: Luca Tettamanti <kronos.it@...il.com>
> Cc: Chris Snook <csnook@...hat.com>

Acked-By: Chris Snook <csnook@...hat.com>
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