linux/drivers/base/power/shutdown.c
David Brownell 0b405a0f7e [PATCH] Driver Core: remove driver model detach_state
The driver model has a "detach_state" mechanism that:

 - Has never been used by any in-kernel drive;
 - Is superfluous, since driver remove() methods can do the same thing;
 - Became buggy when the suspend() parameter changed semantics and type;
 - Could self-deadlock when called from certain suspend contexts;
 - Is effectively wasted documentation, object code, and headspace.

This removes that "detach_state" mechanism; net code shrink, as well
as a per-device saving in the driver model and sysfs.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-17 14:54:55 -07:00

53 lines
1.2 KiB
C

/*
* 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();
}