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metag: use for_each_sg()

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This replaces the plain loop over the sglist array with for_each_sg()
macro which consists of sg_next() function calls.  Since metag 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>
Cc: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2015-06-24 16:54:40 -07:00 committed by Linus Torvalds
parent e3d8238d7f
commit ae70a7bbc5
1 changed files with 9 additions and 5 deletions
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14
arch/metag/include/asm/dma-mapping.h
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@ -134,20 +134,24 @@ 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 direction)
{
int i;
for (i = 0; i < nelems; i++, sg++)
struct scatterlist *sg;
for_each_sg(sglist, sg, nelems, i)
dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
}
static inline void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction direction)
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
int i;
for (i = 0; i < nelems; i++, sg++)
struct scatterlist *sg;
for_each_sg(sglist, sg, nelems, i)
dma_sync_for_device(sg_virt(sg), sg->length, direction);
}