tree 32b6d394c47bd61e530fd322d473dd79c9b70db9
parent 17b6097753e926ca546189463070a7e94e7ea9fa
author David Woodhouse <David.Woodhouse@intel.com> 1254327137 -0700
committer David Woodhouse <David.Woodhouse@intel.com> 1254327137 -0700

intel-iommu: Yet another BIOS workaround: Isoch DMAR unit with no TLB space

Asus decided to ship a BIOS which configures sound DMA to go via the
dedicated IOMMU unit, but assigns precisely zero TLB entries to that
unit. Which causes the whole thing to deadlock, including the DMA
traffic on the _other_ IOMMU units. Nice one.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>