From 85b98276f2ffa66b25ae6328b00bfadfd74b74e7 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Wed, 1 Jul 2009 19:27:53 +0100 Subject: [PATCH] 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 --- drivers/pci/intel-iommu.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 02223e2e27d4..2bbc3fc88dc9 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -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); -- 2.20.1