pci_enable_device(dev);
retval = pci_enable_device(dev);
void pci_enable_bridges(struct pci_bus *bus){	struct pci_dev *dev;	list_for_each_entry(dev, &bus->devices, bus_list) {		if (dev->subordinate) {			pci_enable_device(dev);			pci_set_master(dev);			pci_enable_bridges(dev->subordinate);		}	}}