iommu/arm-smmu-v3: Use WRITE_ONCE() when changing validity of an STE

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[ Upstream commit d71e01716b ]

If, for some bizarre reason, the compiler decided to split up the write
of STE DWORD 0, we could end up making a partial structure valid.

Although this probably won't happen, follow the example of the
context-descriptor code and use WRITE_ONCE() to ensure atomicity of the
write.

Reported-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Will Deacon 2020-01-15 15:21:47 +00:00 • committed by Greg Kroah-Hartman

parent e48b3b04d5

commit 67571f43da

1 changed files with 2 additions and 1 deletions

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drivers/iommu/arm-smmu-v3.c

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