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-rw-r--r--drivers/pci/intel-iommu.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 14308533b1cb..40ce5a03f18f 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1673,7 +1673,16 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
/* We don't need lock here, nobody else
* touches the iova range
*/
- BUG_ON(dma_pte_addr(pte));
+ if (unlikely(dma_pte_addr(pte))) {
+ static int dumps = 5;
+ printk(KERN_CRIT "ERROR: DMA PTE for vPFN 0x%lx already set (to %llx)\n",
+ iov_pfn, pte->val);
+ if (dumps) {
+ dumps--;
+ debug_dma_dump_mappings(NULL);
+ }
+ WARN_ON(1);
+ }
pte->val = pteval;
pte++;
if (!nr_pages ||