linux-kernel - Re: BUG: SCSI aic7xxx driver and AMD IOMMU

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Message-ID: <5511513D.6090106@compro.net>
Date:	Tue, 24 Mar 2015 07:57:49 -0400
From:	Mark Hounschell <markh@...pro.net>
To:	Joerg Roedel <joro@...tes.org>
CC:	"linux-scsi@...r.kernel.org >> SCSI development list" 
	<linux-scsi@...r.kernel.org>, Hannes Reinecke <hare@...e.de>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: BUG: SCSI aic7xxx driver and AMD IOMMU

On 03/23/2015 11:03 AM, Joerg Roedel wrote:
> Hi Mark,
>
> On Tue, Mar 03, 2015 at 02:36:19PM -0500, Mark Hounschell wrote:
>> It looks like this problem is NOT a bug with the SCSI aic7xxx driver
>> after all. I can duplicate this BUG very easily with other hardware.
>> Simply removing a driver module  (whether it its self, has actually
>> used any of the DMA API or not) that is sitting on the same pci bus
>> as a card that is actually using DMA will cause this. And that card
>> that is in use and using DMA will no longer function. It "looks and
>> feels" like unloading a module causes the IOMMU to improperly unmap
>> valid mappings.
>
> You are right, I looked into the code and found the problem. I'll post a
> fix for testing this week.
>

I'll be happy to test it.

Regards
Mark

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