That busn_res is from resources list.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
                list_move_tail(&window->list, &bridge->windows);
                res = window->res;
                offset = window->offset;
-               pci_bus_add_resource(b, res, 0);
+               if (res->flags & IORESOURCE_BUS)
+                       pci_bus_insert_busn_res(b, bus, res->end);
+               else
+                       pci_bus_add_resource(b, res, 0);
                if (offset) {
                        if (resource_type(res) == IORESOURCE_IO)
                                fmt = " (bus address [%#06llx-%#06llx])";