iommu/arm-smmu-v3: Rework enabling/disabling of ATS for PCI masters
To prevent any potential issues arising from speculative Address Translation Requests from an ATS-enabled PCIe endpoint, rework our ATS enabling/disabling logic so that we enable ATS at the SMMU before we enable it at the endpoint, and disable things in the opposite order. Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
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