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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