From: Chris Snook <csnook@redhat.com>
To: Jay Cliburn <jacliburn@bellsouth.net>
Cc: greg@kroah.com, chrisw@sous-sol.org, kronos.it@gmail.com,
linux-kernel@vger.kernel.org, stable@kernel.org
Subject: Re: [2.6.22.y][PATCH] atl1: disable broken 64-bit DMA
Date: Mon, 26 Nov 2007 11:52:41 -0500 [thread overview]
Message-ID: <474AF9D9.8070209@redhat.com> (raw)
In-Reply-To: <20071124191518.GA3672@osprey.hogchain.net>
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@bellsouth.net>
> Cc: Luca Tettamanti <kronos.it@gmail.com>
> Cc: Chris Snook <csnook@redhat.com>
Acked-By: Chris Snook <csnook@redhat.com>
prev parent reply other threads:[~2007-11-26 16:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-24 19:15 [2.6.22.y][PATCH] atl1: disable broken 64-bit DMA Jay Cliburn
2007-11-26 16:52 ` Chris Snook [this message]
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