sparc: Allow handling signals when stack is corrupted.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / irq / pm.c
blobf76fc00c98776746a12fb5dce9111cb4033b1553
1 /*
2 * linux/kernel/irq/pm.c
4 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
6 * This file contains power management functions related to interrupts.
7 */
9 #include <linux/irq.h>
10 #include <linux/module.h>
11 #include <linux/interrupt.h>
13 #include "internals.h"
15 /**
16 * suspend_device_irqs - disable all currently enabled interrupt lines
18 * During system-wide suspend or hibernation device drivers need to be prevented
19 * from receiving interrupts and this function is provided for this purpose.
20 * It marks all interrupt lines in use, except for the timer ones, as disabled
21 * and sets the IRQS_SUSPENDED flag for each of them.
23 void suspend_device_irqs(void)
25 struct irq_desc *desc;
26 int irq;
28 for_each_irq_desc(irq, desc) {
29 unsigned long flags;
31 raw_spin_lock_irqsave(&desc->lock, flags);
32 __disable_irq(desc, irq, true);
33 raw_spin_unlock_irqrestore(&desc->lock, flags);
36 for_each_irq_desc(irq, desc)
37 if (desc->istate & IRQS_SUSPENDED)
38 synchronize_irq(irq);
40 EXPORT_SYMBOL_GPL(suspend_device_irqs);
42 /**
43 * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
45 * Enable all interrupt lines previously disabled by suspend_device_irqs() that
46 * have the IRQS_SUSPENDED flag set.
48 void resume_device_irqs(void)
50 struct irq_desc *desc;
51 int irq;
53 for_each_irq_desc(irq, desc) {
54 unsigned long flags;
56 raw_spin_lock_irqsave(&desc->lock, flags);
57 __enable_irq(desc, irq, true);
58 raw_spin_unlock_irqrestore(&desc->lock, flags);
61 EXPORT_SYMBOL_GPL(resume_device_irqs);
63 /**
64 * check_wakeup_irqs - check if any wake-up interrupts are pending
66 int check_wakeup_irqs(void)
68 struct irq_desc *desc;
69 int irq;
71 for_each_irq_desc(irq, desc) {
72 if (irqd_is_wakeup_set(&desc->irq_data)) {
73 if (desc->istate & IRQS_PENDING)
74 return -EBUSY;
75 continue;
78 * Check the non wakeup interrupts whether they need
79 * to be masked before finally going into suspend
80 * state. That's for hardware which has no wakeup
81 * source configuration facility. The chip
82 * implementation indicates that with
83 * IRQCHIP_MASK_ON_SUSPEND.
85 if (desc->istate & IRQS_SUSPENDED &&
86 irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND)
87 mask_irq(desc);
90 return 0;