intel-iommu: Warn about unmatched unmap requests
This would have found the bug in i386 pci_unmap_addr() a long time ago. We shouldn't just silently return without doing anything. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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@ -2640,7 +2640,8 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
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iommu = domain_get_iommu(domain);
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iova = find_iova(&domain->iovad, IOVA_PFN(dev_addr));
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if (!iova)
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if (WARN_ONCE(!iova, "Driver unmaps unmatched page at PFN %llx\n",
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(unsigned long long)dev_addr))
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return;
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start_pfn = mm_to_dma_pfn(iova->pfn_lo);
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@ -2730,7 +2731,8 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
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iommu = domain_get_iommu(domain);
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iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address));
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if (!iova)
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if (WARN_ONCE(!iova, "Driver unmaps unmatched sglist at PFN %llx\n",
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(unsigned long long)sglist[0].dma_address))
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return;
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start_pfn = mm_to_dma_pfn(iova->pfn_lo);
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