0b405a0f7e
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>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/*
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* shutdown.c - power management functions for the device tree.
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*
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* Copyright (c) 2002-3 Patrick Mochel
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* 2002-3 Open Source Development Lab
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/config.h>
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#include <linux/device.h>
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#include <asm/semaphore.h>
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#include "power.h"
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#define to_dev(node) container_of(node, struct device, kobj.entry)
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extern struct subsystem devices_subsys;
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/**
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* We handle system devices differently - we suspend and shut them
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* down last and resume them first. That way, we don't do anything stupid like
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* shutting down the interrupt controller before any devices..
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*
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* Note that there are not different stages for power management calls -
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* they only get one called once when interrupts are disabled.
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*/
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extern int sysdev_shutdown(void);
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/**
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* device_shutdown - call ->shutdown() on each device to shutdown.
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*/
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void device_shutdown(void)
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{
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struct device * dev;
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down_write(&devices_subsys.rwsem);
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list_for_each_entry_reverse(dev, &devices_subsys.kset.list,
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kobj.entry) {
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if (dev->driver && dev->driver->shutdown) {
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dev_dbg(dev, "shutdown\n");
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dev->driver->shutdown(dev);
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}
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}
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up_write(&devices_subsys.rwsem);
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sysdev_shutdown();
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}
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