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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-07-27 15:29:21 +0300
committerThierry Reding <treding@nvidia.com>2015-08-13 17:06:39 +0300
commit0b42c7c1132f331fba263f0d2ca23544770584b7 (patch)
tree70277b41ac6145870f6e4f3640bb36151eba9da7 /sound/oss/Kconfig
parent34d35f8cbe51bf93faf3214ee5b5d6f8ae7df4c1 (diff)
downloadlinux-0b42c7c1132f331fba263f0d2ca23544770584b7.tar.xz
iommu/tegra-smmu: Fix page table lookup in unmap/iova_to_phys methods
Fix the page table lookup in the unmap and iova_to_phys methods. Neither of these methods should allocate a page table; a missing page table should be treated the same as no mapping present. More importantly, using as_get_pte() for an IOVA corresponding with a non-present page table entry increments the use-count for the page table, on the assumption that the caller of as_get_pte() is going to setup a mapping. This is an incorrect assumption. Fix both of these bugs by providing a separate helper which only looks up the page table, but never allocates it. This is akin to pte_offset() for CPU page tables. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'sound/oss/Kconfig')
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