From: Akinobu Mita Date: Fri, 1 May 2015 06:47:22 +0000 (+0900) Subject: m68k: Use for_each_sg() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1214c525484cabb27ed37df936c3451682757263;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git m68k: Use for_each_sg() This replaces the plain loop over the sglist array with for_each_sg() macro which consists of sg_next() function calls. Since m68k doesn't select ARCH_HAS_SG_CHAIN, it is not necessary to use for_each_sg() in order to loop over each sg element. But this can help find problems with drivers that do not properly initialize their sg tables when CONFIG_DEBUG_SG is enabled. Signed-off-by: Akinobu Mita Cc: Geert Uytterhoeven Cc: linux-m68k@lists.linux-m68k.org Cc: linux-arch@vger.kernel.org Signed-off-by: Geert Uytterhoeven --- diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c index e546a5534dd4..564665f9af30 100644 --- a/arch/m68k/kernel/dma.c +++ b/arch/m68k/kernel/dma.c @@ -120,13 +120,16 @@ void dma_sync_single_for_device(struct device *dev, dma_addr_t handle, } EXPORT_SYMBOL(dma_sync_single_for_device); -void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents, - enum dma_data_direction dir) +void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, + int nents, enum dma_data_direction dir) { int i; + struct scatterlist *sg; - for (i = 0; i < nents; sg++, i++) - dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir); + for_each_sg(sglist, sg, nents, i) { + dma_sync_single_for_device(dev, sg->dma_address, sg->length, + dir); + } } EXPORT_SYMBOL(dma_sync_sg_for_device); @@ -151,14 +154,16 @@ dma_addr_t dma_map_page(struct device *dev, struct page *page, } EXPORT_SYMBOL(dma_map_page); -int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, +int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction dir) { int i; + struct scatterlist *sg; - for (i = 0; i < nents; sg++, i++) { + for_each_sg(sglist, sg, nents, i) { sg->dma_address = sg_phys(sg); - dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir); + dma_sync_single_for_device(dev, sg->dma_address, sg->length, + dir); } return nents; }