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x86/amd_gart: fix unmapping of non-GART mappings 

In many cases we don't have to create a GART mapping at all, which
also means there is nothing to unmap.  Fix the range check that was
incorrectly modified when removing the mapping_error method.

Fixes: 9e8aa6b546 ("x86/amd_gart: remove the mapping_error dma_map_ops method")
Reported-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Michal Kubecek <mkubecek@suse.cz>
This commit is contained in:
Christoph Hellwig 2019-01-04 09:50:33 +01:00
parent 48e638fb68
commit 06f55fd2d2
1 changed files with 9 additions and 1 deletions
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10
arch/x86/kernel/amd_gart_64.c
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@ -256,7 +256,15 @@ static void gart_unmap_page(struct device *dev, dma_addr_t dma_addr,
int npages;
int i;
if (dma_addr == DMA_MAPPING_ERROR ||
if (WARN_ON_ONCE(dma_addr == DMA_MAPPING_ERROR))
return;
/*
* This driver will not always use a GART mapping, but might have
* created a direct mapping instead. If that is the case there is
* nothing to unmap here.
*/
if (dma_addr < iommu_bus_base ||
dma_addr >= iommu_bus_base + iommu_size)
return;