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authorDavid Woodhouse <David.Woodhouse@intel.com>2009-07-01 19:27:53 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-07-01 19:54:37 +0100
commit85b98276f2ffa66b25ae6328b00bfadfd74b74e7 (patch)
tree17ae570435b8d46e217803b2c536a41f6e8a0c18 /drivers
parent206a73c102fc480ba072a9388bc2142c303113aa (diff)
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/intel-iommu.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 02223e2e27d..2bbc3fc88dc 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);