diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index b7268a14184f..f6533e0198f6 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -138,7 +138,7 @@ static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
 				break;	/* found a free slot */
 		}
 adjust_limit_pfn:
-		limit_pfn = curr_iova->pfn_lo - 1;
+		limit_pfn = curr_iova->pfn_lo ? (curr_iova->pfn_lo - 1) : 0;
 move_left:
 		prev = curr;
 		curr = rb_prev(curr);