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dma-direct: use dma_direct_map_page to implement dma_direct_map_sg 

No need to duplicate the mapping logic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Christoph Hellwig 2018-12-03 11:14:09 +01:00
parent 58dfd4ac02
commit 17ac524719
1 changed files with 5 additions and 9 deletions
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14
kernel/dma/direct.c
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@ -217,6 +217,7 @@ static void dma_direct_sync_single_for_device(struct device *dev,
arch_sync_dma_for_device(dev, dma_to_phys(dev, addr), size, dir);
}
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE)
static void dma_direct_sync_sg_for_device(struct device *dev,
struct scatterlist *sgl, int nents, enum dma_data_direction dir)
{
@ -229,6 +230,7 @@ static void dma_direct_sync_sg_for_device(struct device *dev,
for_each_sg(sgl, sg, nents, i)
arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir);
}
#endif
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
@ -294,19 +296,13 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
struct scatterlist *sg;
for_each_sg(sgl, sg, nents, i) {
BUG_ON(!sg_page(sg));
sg_dma_address(sg) = phys_to_dma(dev, sg_phys(sg));
if (unlikely(dev && !dma_capable(dev, sg_dma_address(sg),
sg->length))) {
report_addr(dev, sg_dma_address(sg), sg->length);
sg->dma_address = dma_direct_map_page(dev, sg_page(sg),
sg->offset, sg->length, dir, attrs);
if (sg->dma_address == DMA_MAPPING_ERROR)
return 0;
}
sg_dma_len(sg) = sg->length;
}
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
dma_direct_sync_sg_for_device(dev, sgl, nents, dir);
return nents;
}