From: David Stevens <[email protected]> If SKIP_CPU_SYNC isn't already set, then iommu_dma_unmap_(page|sg) has already called iommu_dma_sync_(single|sg)_for_cpu, so there is no need to copy from the bounce buffer again.
Signed-off-by: David Stevens <[email protected]> --- drivers/iommu/dma-iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index e79e274d2dc5..0a9a9a343e64 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -505,7 +505,8 @@ static void __iommu_dma_unmap_swiotlb(struct device *dev, dma_addr_t dma_addr, __iommu_dma_unmap(dev, dma_addr, size); if (unlikely(is_swiotlb_buffer(phys))) - swiotlb_tbl_unmap_single(dev, phys, size, dir, attrs); + swiotlb_tbl_unmap_single(dev, phys, size, dir, + attrs | DMA_ATTR_SKIP_CPU_SYNC); } static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, -- 2.32.0.93.g670b81a890-goog _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
