Hi Anton,

On 04.10.2012, at 06:57, Anton Blanchard wrote:

Hi Alex,

Looks to be a preempt issue with the iommu pools code. I did find a
couple more bugs along the way too.

Anton
--

There are a number of issues in the recent IOMMU pools code:

- On a preempt kernel we might switch CPUs in the middle of building
 a scatter gather list. When this happens the handle hint passed in
 no longer falls within the local CPU's pool. Check for this and
 fall back to the pool hint.

- We were missing a spin_unlock/spin_lock in one spot where we
 switch pools.

- We need to provide locking around dart_tlb_invalidate_all and
 dart_tlb_invalidate_one now that the global lock is gone.

Reported-by: Alexander Graf <redacted>
Signed-off-by: Anton Blanchard <redacted>
---

There is still an issue with the lazy u3 flushing, but I wanted
to get this out for testing.

Yup. It fixes the nfs problem on my U4 based machine.

Tested-by: Alexander Graf <redacted>

Alex