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iommu/vt-d: remove the mapping_error dma_map_ops method 

Return DMA_MAPPING_ERROR instead of 0 on a dma mapping failure 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 19:34:10 +01:00
parent 964f2311a6
commit 524a669bdd
1 changed files with 3 additions and 9 deletions
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12
drivers/iommu/intel-iommu.c
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@ -3617,7 +3617,7 @@ static dma_addr_t __intel_map_page(struct device *dev, struct page *page,
domain = get_valid_domain_for_dev(dev);
if (!domain)
return 0;
return DMA_MAPPING_ERROR;
iommu = domain_get_iommu(domain);
size = aligned_nrpages(paddr, size);
@ -3655,7 +3655,7 @@ error:
free_iova_fast(&domain->iovad, iova_pfn, dma_to_mm_pfn(size));
pr_err("Device %s request: %zx@%llx dir %d --- failed\n",
dev_name(dev), size, (unsigned long long)paddr, dir);
return 0;
return DMA_MAPPING_ERROR;
}
static dma_addr_t intel_map_page(struct device *dev, struct page *page,
@ -3756,7 +3756,7 @@ static void *intel_alloc_coherent(struct device *dev, size_t size,
*dma_handle = __intel_map_page(dev, page, 0, size, DMA_BIDIRECTIONAL,
dev->coherent_dma_mask);
if (*dma_handle)
if (*dma_handle != DMA_MAPPING_ERROR)
return page_address(page);
if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
__free_pages(page, order);
@ -3865,11 +3865,6 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
return nelems;
}
static int intel_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return !dma_addr;
}
static const struct dma_map_ops intel_dma_ops = {
.alloc = intel_alloc_coherent,
.free = intel_free_coherent,
@ -3877,7 +3872,6 @@ static const struct dma_map_ops intel_dma_ops = {
.unmap_sg = intel_unmap_sg,
.map_page = intel_map_page,
.unmap_page = intel_unmap_page,
.mapping_error = intel_mapping_error,
.dma_supported = dma_direct_supported,
};