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Commit 92ed932d authored by Akinobu Mita's avatar Akinobu Mita Committed by Linus Torvalds
Browse files

arc: 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 arc 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: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Acked-by: default avatarVineet Gupta <vgupta@synopsys.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9ce71148

arch/arc/include/asm/dma-mapping.h

+7 −5
Original line number Diff line number Diff line
@@ -178,22 +178,24 @@ dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, 
}



static inline void

dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,

dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nelems,

		    enum dma_data_direction dir)

{

	int i;

	struct scatterlist *sg;



	for (i = 0; i < nelems; i++, sg++)

	for_each_sg(sglist, sg, nelems, i)

		_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);

}



static inline void

dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,

		       enum dma_data_direction dir)

dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,

		       int nelems, enum dma_data_direction dir)

{

	int i;

	struct scatterlist *sg;



	for (i = 0; i < nelems; i++, sg++)

	for_each_sg(sglist, sg, nelems, i)

		_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);

}