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

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Date:	Mon, 23 Mar 2015 16:03:04 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Mark Hounschell <markh@...pro.net>
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

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.


	Joerg

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