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authorLu Baolu2020-11-24 16:20:54 +0800
committerWill Deacon2020-11-25 12:03:48 +0000
commit65f746e8285f0a67d43517d86fedb9e29ead49f2 (patch)
tree5dee8b1806d5932e56912dcce9fea9a4335a7746 /block/blk-throttle.c
parent82612d66d51d3bacdd789e31d2e875d2494b7514 (diff)
iommu: Add quirk for Intel graphic devices in map_sg
Combining the sg segments exposes a bug in the Intel i915 driver which causes visual artifacts and the screen to freeze. This is most likely because of how the i915 handles the returned list. It probably doesn't respect the returned value specifying the number of elements in the list and instead depends on the previous behaviour of the Intel iommu driver which would return the same number of elements in the output list as in the input list. [ This has been fixed in the i915 tree, but we agreed to carry this fix temporarily in the iommu tree and revert it before 5.11 is released: https://lore.kernel.org/linux-iommu/20201103105442.GD22888@8bytes.org/ -- Will ] Signed-off-by: Tom Murphy <murphyt7@tcd.ie> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Tested-by: Logan Gunthorpe <logang@deltatee.com> Link: https://lore.kernel.org/r/20201124082057.2614359-5-baolu.lu@linux.intel.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'block/blk-throttle.c')
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