/* * shutdown.c - power management functions for the device tree. * * Copyright (c) 2002-3 Patrick Mochel *		 2002-3 Open Source Development Lab * * This file is released under the GPLv2 * */#include <linux/config.h>#include <linux/device.h>#include <asm/semaphore.h>#include "power.h"#define to_dev(node) container_of(node, struct device, kobj.entry)extern struct subsystem devices_subsys;/** * We handle system devices differently - we suspend and shut them * down last and resume them first. That way, we don't do anything stupid like * shutting down the interrupt controller before any devices.. * * Note that there are not different stages for power management calls - * they only get one called once when interrupts are disabled. */extern int sysdev_shutdown(void);/** * device_shutdown - call ->shutdown() on each device to shutdown. */void device_shutdown(void){	struct device * dev;	down_write(&devices_subsys.rwsem);	list_for_each_entry_reverse(dev, &devices_subsys.kset.list,				kobj.entry) {		if (dev->driver && dev->driver->shutdown) {			dev_dbg(dev, "shutdown\n");			dev->driver->shutdown(dev);		}	}	up_write(&devices_subsys.rwsem);	sysdev_shutdown();}