Index: head/sys/dev/ofw/ofwbus.c
===================================================================
--- head/sys/dev/ofw/ofwbus.c
+++ head/sys/dev/ofw/ofwbus.c
@@ -271,12 +271,17 @@
     int rid, struct resource *r)
 {
 	struct resource_list_entry *rle;
+	int passthrough;
 	int error;
 
-	/* Clean resource list entry */
-	rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), type, rid);
-	if (rle != NULL)
-		rle->res = NULL;
+	passthrough = (device_get_parent(child) != bus);
+	if (!passthrough) {
+		/* Clean resource list entry */
+		rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
+		    type, rid);
+		if (rle != NULL)
+			rle->res = NULL;
+	}
 
 	if ((rman_get_flags(r) & RF_ACTIVE) != 0) {
 		error = bus_deactivate_resource(child, type, rid, r);