Index: head/sys/dev/ofw/ofw_bus_subr.c
===================================================================
--- head/sys/dev/ofw/ofw_bus_subr.c
+++ head/sys/dev/ofw/ofw_bus_subr.c
@@ -445,7 +445,7 @@
 		if (OF_searchencprop(node, "interrupt-parent", &iparent,
 		    sizeof(iparent)) == -1) {
 			for (iparent = node; iparent != 0;
-			    iparent = OF_parent(node)) {
+			    iparent = OF_parent(iparent)) {
 				if (OF_hasprop(iparent, "interrupt-controller"))
 					break;
 			}