diff --git a/sys/dev/iommu/iommu_gas.c b/sys/dev/iommu/iommu_gas.c
--- a/sys/dev/iommu/iommu_gas.c
+++ b/sys/dev/iommu/iommu_gas.c
@@ -398,16 +398,11 @@
 	 */
 	entry = first;
 	while (entry != NULL) {
-		if ((first = RB_LEFT(entry, rb_entry)) != NULL) {
-			if (first->last >= a->common->lowaddr) {
-				/* All remaining ranges >= lowaddr */
-				break;
-			}
-			if (iommu_gas_match_one(a, first->last, entry->start,
-			    a->common->lowaddr)) {
-				iommu_gas_match_insert(a);
-				return (0);
-			}
+		if ((first = RB_LEFT(entry, rb_entry)) != NULL &&
+		    iommu_gas_match_one(a, first->last, entry->start,
+		    a->common->lowaddr)) {
+			iommu_gas_match_insert(a);
+			return (0);
 		}
 		if (entry->end >= a->common->lowaddr) {
 			/* All remaining ranges >= lowaddr */