From 72fd97bf4e75e37552640614a0ea98897fc1dd77 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 21 Nov 2018 18:57:36 +0100 Subject: arm: remove the mapping_error dma_map_ops method Arm already returns (~(dma_addr_t)0x0) on mapping failures, so we can switch over to returning DMA_MAPPING_ERROR and let the core dma-mapping code handle the rest. Signed-off-by: Christoph Hellwig Acked-by: Russell King Acked-by: Linus Torvalds --- arch/arm/include/asm/dma-iommu.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h index 6821f1249300..772f48ef84b7 100644 --- a/arch/arm/include/asm/dma-iommu.h +++ b/arch/arm/include/asm/dma-iommu.h @@ -9,8 +9,6 @@ #include #include -#define ARM_MAPPING_ERROR (~(dma_addr_t)0x0) - struct dma_iommu_mapping { /* iommu specific data */ struct iommu_domain *domain; -- cgit v1.2.3 From 356da6d0cde3323236977fce54c1f9612a742036 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 6 Dec 2018 13:39:32 -0800 Subject: dma-mapping: bypass indirect calls for dma-direct Avoid expensive indirect calls in the fast path DMA mapping operations by directly calling the dma_direct_* ops if we are using the directly mapped DMA operations. Signed-off-by: Christoph Hellwig Acked-by: Jesper Dangaard Brouer Tested-by: Jesper Dangaard Brouer Tested-by: Tony Luck --- arch/arm/include/asm/dma-mapping.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 965b7c846ecb..31d3b96f0f4b 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -18,7 +18,7 @@ extern const struct dma_map_ops arm_coherent_dma_ops; static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) { - return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_direct_ops; + return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : NULL; } #ifdef __arch_page_to_dma -- cgit v1.2.3