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Kefeng Wang
ed59dfd950
The memory barrier dma_mb() is introduced by commit a76a37777f
("iommu/arm-smmu-v3: Ensure queue is read after updating prod pointer"),
which is used to ensure that prior (both reads and writes) accesses
to memory by a CPU are ordered w.r.t. a subsequent MMIO write.
Reviewed-by: Arnd Bergmann <[email protected]> # for asm-generic
Signed-off-by: Kefeng Wang <[email protected]>
Reviewed-by: Marco Elver <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>