linux-kernel - Re: [PATCH v2] x86: Reenable the AMD IOMMU if it's mysteriously vanished over suspend

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Message-ID: <20101006100734.GX9817@amd.com>
Date:	Wed, 6 Oct 2010 12:07:35 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Matthew Garrett <mjg@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"stable@...nel.org" <stable@...nel.org>
Subject: Re: [PATCH v2] x86: Reenable the AMD IOMMU if it's mysteriously
 vanished over suspend

On Mon, Oct 04, 2010 at 02:59:31PM -0400, Matthew Garrett wrote:
> AMD's reference BIOS code had a bug that could result in the firmware
> failing to reenable the iommu on resume. It transpires that this causes
> certain less than desirable behaviour when it comes to PCI accesses, to
> whit them ending up somewhere near Bristol when the more desirable outcome
> was Edinburgh. Sadness ensues, perhaps along with filesystem corruption.
> Let's make sure that it gets turned back on, and that we restore its
> configuration so decisions it makes bear some resemblance to those made by
> reasonable people rather than crack-addled lemurs who spent all your DMA
> on Thunderbird.
> 
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
> Cc: stable@...nel.org

Applied, thanks a lot.

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