From: Anton Blanchard <anton@samba.org>
Date: Wed, 3 Oct 2012 18:57:10 +0000 (+0000)
Subject: powerpc/iommu: Fix multiple issues with IOMMU pools code
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~10^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d900bd7366463fd96a907b2c212242e2b68b27d8;p=pandora-kernel.git

powerpc/iommu: Fix multiple issues with IOMMU pools code

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 <agraf@suse.de>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@kernel.org> [v3.6]
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