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genirq: Move suspend/resume logic into irq/pm code

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No functional change. Preparatory patch for cleaning up the suspend
abort functionality. Update the comments while at it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Thomas Gleixner 2014-08-28 11:49:28 +02:00 • committed by Rafael J. Wysocki
parent 068765ba79
commit 8df2e02c5c
3 changed files with 45 additions and 31 deletions
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44
kernel/irq/pm.c
View file

@ -13,13 +13,26 @@
#include "internals.h"
static void suspend_device_irq(struct irq_desc *desc, int irq)
{
if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND))
return;
desc->istate |= IRQS_SUSPENDED;
__disable_irq(desc, irq);
}
/**
* 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 IRQS_SUSPENDED flag for each of them.
* During system-wide suspend or hibernation device drivers need to be
* prevented from receiving interrupts and this function is provided
* for this purpose.
*
* So we disable all interrupts and mark them IRQS_SUSPENDED except
* for those which are unused and those which are marked as not
* suspendable via an interrupt request with the flag IRQF_NO_SUSPEND
* set.
*/
void suspend_device_irqs(void)
{
@ -30,7 +43,7 @@ void suspend_device_irqs(void)
unsigned long flags;
raw_spin_lock_irqsave(&desc->lock, flags);
__disable_irq(desc, irq, true);
suspend_device_irq(desc, irq);
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
@ -40,6 +53,25 @@ void suspend_device_irqs(void)
}
EXPORT_SYMBOL_GPL(suspend_device_irqs);
static void resume_irq(struct irq_desc *desc, int irq)
{
if (desc->istate & IRQS_SUSPENDED)
goto resume;
if (!desc->action)
return;
/* Interrupts marked with that flag are force reenabled */
if (!(desc->action->flags & IRQF_FORCE_RESUME))
return;
/* Pretend that it got disabled ! */
desc->depth++;
resume:
desc->istate &= ~IRQS_SUSPENDED;
__enable_irq(desc, irq);
}
static void resume_irqs(bool want_early)
{
struct irq_desc *desc;
@ -54,7 +86,7 @@ static void resume_irqs(bool want_early)
continue;
raw_spin_lock_irqsave(&desc->lock, flags);
__enable_irq(desc, irq, true);
resume_irq(desc, irq);
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
}