pci_scan_bridge_extend
return pci_scan_bridge_extend(bus, dev, max, 0, pass);
max = pci_scan_bridge_extend(bus, dev, max, 0, 0);
max = pci_scan_bridge_extend(bus, dev, cmax, buses, 1);
pci_scan_bridge_extend(parent, dev, busnr, available_buses, 1);