Kefeng Wang 5cd4c42f32 asm-generic: Add memory barrier dma_mb() ... [ Upstream commit 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 <arnd@arndb.de> # for asm-generic Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: Marco Elver <elver@google.com> Link: https://lore.kernel.org/r/20220523113126.171714-2-wangkefeng.wang@huawei.com Signed-off-by: Will Deacon <will@kernel.org> Stable-dep-of: aa6956150f ("wifi: ath11k: fix dest ring-buffer corruption when ring is full") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-08-28 16:22:57 +02:00
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memory-barriers.txt	asm-generic: Add memory barrier dma_mb()	2025-08-28 16:22:57 +02:00
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