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dma-direct: remove the mapping_error dma_map_ops method

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The dma-direct code already returns (~(dma_addr_t)0x0) on mapping
failures, so we can switch over to returning DMA_MAPPING_ERROR and let
the core dma-mapping code handle the rest.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig
2018-11-21 18:52:35 +01:00
parent 42ee3cae0e
commit b0cbeae494
4 changed files with 6 additions and 17 deletions
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11
kernel/dma/swiotlb.c
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@@ -631,21 +631,21 @@ static dma_addr_t swiotlb_bounce_page(struct device *dev, phys_addr_t *phys,
if (unlikely(swiotlb_force == SWIOTLB_NO_FORCE)) {
dev_warn_ratelimited(dev,
"Cannot do DMA to address %pa\n", phys);
return DIRECT_MAPPING_ERROR;
return DMA_MAPPING_ERROR;
}
/* Oh well, have to allocate and map a bounce buffer. */
*phys = swiotlb_tbl_map_single(dev, __phys_to_dma(dev, io_tlb_start),
*phys, size, dir, attrs);
if (*phys == SWIOTLB_MAP_ERROR)
return DIRECT_MAPPING_ERROR;
return DMA_MAPPING_ERROR;
/* Ensure that the address returned is DMA'ble */
dma_addr = __phys_to_dma(dev, *phys);
if (unlikely(!dma_capable(dev, dma_addr, size))) {
swiotlb_tbl_unmap_single(dev, *phys, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
return DIRECT_MAPPING_ERROR;
return DMA_MAPPING_ERROR;
}
return dma_addr;
@@ -680,7 +680,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
if (!dev_is_dma_coherent(dev) &&
(attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0 &&
dev_addr != DIRECT_MAPPING_ERROR)
dev_addr != DMA_MAPPING_ERROR)
arch_sync_dma_for_device(dev, phys, size, dir);
return dev_addr;
@@ -789,7 +789,7 @@ swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nelems,
for_each_sg(sgl, sg, nelems, i) {
sg->dma_address = swiotlb_map_page(dev, sg_page(sg), sg->offset,
sg->length, dir, attrs);
if (sg->dma_address == DIRECT_MAPPING_ERROR)
if (sg->dma_address == DMA_MAPPING_ERROR)
goto out_error;
sg_dma_len(sg) = sg->length;
}
@@ -869,7 +869,6 @@ swiotlb_dma_supported(struct device *hwdev, u64 mask)
}
const struct dma_map_ops swiotlb_dma_ops = {
.mapping_error = dma_direct_mapping_error,
.alloc = dma_direct_alloc,
.free = dma_direct_free,
.sync_single_for_cpu = swiotlb_sync_single_for_cpu,