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intel-iommu: Warn about unmatched unmap requests

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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>
This commit is contained in:
David Woodhouse 2009-07-01 19:27:53 +01:00
parent 206a73c102
commit 85b98276f2
1 changed files with 4 additions and 2 deletions
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6
drivers/pci/intel-iommu.c
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@ -2640,7 +2640,8 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
iommu = domain_get_iommu(domain);
iova = find_iova(&domain->iovad, IOVA_PFN(dev_addr));
if (!iova)
if (WARN_ONCE(!iova, "Driver unmaps unmatched page at PFN %llx\n",
(unsigned long long)dev_addr))
return;
start_pfn = mm_to_dma_pfn(iova->pfn_lo);
@ -2730,7 +2731,8 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
iommu = domain_get_iommu(domain);
iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address));
if (!iova)
if (WARN_ONCE(!iova, "Driver unmaps unmatched sglist at PFN %llx\n",
(unsigned long long)sglist[0].dma_address))
return;
start_pfn = mm_to_dma_pfn(iova->pfn_lo);