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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>
hifive-unleashed-5.1
Akinobu Mita 2015-06-30 14:58:30 -07:00 committed by Linus Torvalds
parent 9ce71148b0
commit 92ed932d30
1 changed files with 7 additions and 5 deletions
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12
arch/arc/include/asm/dma-mapping.h
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@ -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);
}