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: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -178,22 +178,24 @@ dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nelems,
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enum dma_data_direction dir)
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{
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int i;
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struct scatterlist *sg;
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for (i = 0; i < nelems; i++, sg++)
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for_each_sg(sglist, sg, nelems, i)
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_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
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}
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static inline void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction dir)
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
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int nelems, enum dma_data_direction dir)
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{
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int i;
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struct scatterlist *sg;
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for (i = 0; i < nelems; i++, sg++)
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for_each_sg(sglist, sg, nelems, i)
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_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
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}
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