Re: BUG: SCSI aic7xxx driver and AMD IOMMU

[Mark Hounschell]

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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