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swiotlb: use swiotlb_map_page in swiotlb_map_sg_attrs 

No need to duplicate the code - map_sg is equivalent to map_page
for each page in the scatterlist.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
hifive-unleashed-5.1
Christoph Hellwig 2018-08-20 15:56:05 +02:00
parent 27744e0077
commit 4803b44e68
1 changed files with 12 additions and 22 deletions
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34
kernel/dma/swiotlb.c
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@ -845,37 +845,27 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
* same here.
*/
int
swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nelems,
enum dma_data_direction dir, unsigned long attrs)
{
struct scatterlist *sg;
int i;
BUG_ON(dir == DMA_NONE);
for_each_sg(sgl, sg, nelems, i) {
phys_addr_t paddr = sg_phys(sg);
dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
if (swiotlb_force == SWIOTLB_FORCE ||
!dma_capable(hwdev, dev_addr, sg->length)) {
phys_addr_t map = map_single(hwdev, sg_phys(sg),
sg->length, dir, attrs);
if (map == SWIOTLB_MAP_ERROR) {
/* Don't panic here, we expect map_sg users
to do proper error handling. */
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
attrs);
sg_dma_len(sgl) = 0;
return 0;
}
sg->dma_address = __phys_to_dma(hwdev, map);
} else
sg->dma_address = dev_addr;
sg->dma_address = swiotlb_map_page(dev, sg_page(sg), sg->offset,
sg->length, dir, attrs);
if (sg->dma_address == DIRECT_MAPPING_ERROR)
goto out_error;
sg_dma_len(sg) = sg->length;
}
return nelems;
out_error:
swiotlb_unmap_sg_attrs(dev, sgl, i, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
sg_dma_len(sgl) = 0;
return 0;
}
/*