mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 18:53:24 +00:00
c71320d0c4
The kerneldoc comment describing suspend_device_irqs() is currently misleading, because generally the function doesn't really disable interrupt lines at the chip level. Replace it with a more accurate one. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> LKML-Reference: <200907050022.35117.rjw@sisk.pl> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/*
|
|
* linux/kernel/irq/pm.c
|
|
*
|
|
* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
|
|
*
|
|
* This file contains power management functions related to interrupts.
|
|
*/
|
|
|
|
#include <linux/irq.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include "internals.h"
|
|
|
|
/**
|
|
* suspend_device_irqs - disable all currently enabled interrupt lines
|
|
*
|
|
* During system-wide suspend or hibernation device drivers need to be prevented
|
|
* from receiving interrupts and this function is provided for this purpose.
|
|
* It marks all interrupt lines in use, except for the timer ones, as disabled
|
|
* and sets the IRQ_SUSPENDED flag for each of them.
|
|
*/
|
|
void suspend_device_irqs(void)
|
|
{
|
|
struct irq_desc *desc;
|
|
int irq;
|
|
|
|
for_each_irq_desc(irq, desc) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&desc->lock, flags);
|
|
__disable_irq(desc, irq, true);
|
|
spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
|
|
for_each_irq_desc(irq, desc)
|
|
if (desc->status & IRQ_SUSPENDED)
|
|
synchronize_irq(irq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(suspend_device_irqs);
|
|
|
|
/**
|
|
* resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
|
|
*
|
|
* Enable all interrupt lines previously disabled by suspend_device_irqs() that
|
|
* have the IRQ_SUSPENDED flag set.
|
|
*/
|
|
void resume_device_irqs(void)
|
|
{
|
|
struct irq_desc *desc;
|
|
int irq;
|
|
|
|
for_each_irq_desc(irq, desc) {
|
|
unsigned long flags;
|
|
|
|
if (!(desc->status & IRQ_SUSPENDED))
|
|
continue;
|
|
|
|
spin_lock_irqsave(&desc->lock, flags);
|
|
__enable_irq(desc, irq, true);
|
|
spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(resume_device_irqs);
|
|
|
|
/**
|
|
* check_wakeup_irqs - check if any wake-up interrupts are pending
|
|
*/
|
|
int check_wakeup_irqs(void)
|
|
{
|
|
struct irq_desc *desc;
|
|
int irq;
|
|
|
|
for_each_irq_desc(irq, desc)
|
|
if ((desc->status & IRQ_WAKEUP) && (desc->status & IRQ_PENDING))
|
|
return -EBUSY;
|
|
|
|
return 0;
|
|
}
|