Re: BUG: SCSI aic7xxx driver and AMD IOMMU

From: Joerg Roedel
Date: Mon Mar 23 2015 - 11:03:11 EST

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.


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