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dma-mapping: remove bogus test for pfn_valid from dma_map_resource
commita9c38c5d26
upstream. dma_map_resource() uses pfn_valid() to ensure the range is not RAM. However, pfn_valid() only checks for availability of the memory map for a PFN but it does not ensure that the PFN is actually backed by RAM. As dma_map_resource() is the only method in DMA mapping APIs that has this check, simply drop the pfn_valid() test from dma_map_resource(). Link: https://lore.kernel.org/all/20210824173741.GC623@arm.com/ Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: David Hildenbrand <david@redhat.com> Link: https://lore.kernel.org/r/20210930013039.11260-2-rppt@kernel.org Signed-off-by: Will Deacon <will@kernel.org> Fixes:859a85ddf9
("mm: remove pfn_valid_within() and CONFIG_HOLES_IN_ZONE") Link: https://lore.kernel.org/r/Yl0IZWT2nsiYtqBT@linux.ibm.com Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -296,10 +296,6 @@ dma_addr_t dma_map_resource(struct device *dev, phys_addr_t phys_addr,
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if (WARN_ON_ONCE(!dev->dma_mask))
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return DMA_MAPPING_ERROR;
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/* Don't allow RAM to be mapped */
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if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
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return DMA_MAPPING_ERROR;
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if (dma_map_direct(dev, ops))
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addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs);
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else if (ops->map_resource)
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