if(controller->ops->set_power) {
if (controller->ops->set_power)
enable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = hotplug_slot->private;	int retval = 0;	dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);	if(controller->ops->set_power) {		retval = controller->ops->set_power(slot, 1);	}	return retval;}