From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 1/10] PM: Rework handling of interrupts during suspend-resume (rev. 5)
Date: Wed, 11 Mar 2009 22:15:00 +0100
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Cc: pm list <linux-pm@lists.linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
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       "Eric W. Biederman" <ebiederm@xmission.com>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Jeremy Fitzhardinge <jeremy@goop.org>, Len Brown <lenb@kernel.org>,
       Jesse Barnes <jbarnes@virtuousgeek.org>, Frans Pop <elendil@planet.nl>,
       Arve =?iso-8859-1?q?Hj=F8nnev=E5g?= <arve@android.com>
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On Wednesday 11 March 2009, Thomas Gleixner wrote:
> Rafael,
> 
> On Wed, 11 Mar 2009, Rafael J. Wysocki wrote:
> 
> > Index: linux-2.6/kernel/irq/pm.c
> > ===================================================================
> > --- /dev/null
> > +++ linux-2.6/kernel/irq/pm.c
> > @@ -0,0 +1,89 @@
> > +/*
> > + * 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 interrupts need to be
> > + * disabled at the chip level and this function is provided for this purpose.
> > + * It disables all interrupt lines that are enabled at the moment and sets the
> > + * IRQ_SUSPENDED flag for them.
> > + */
> > +void suspend_device_irqs(void)
> > +{
> > +	struct irq_desc *desc;
> > +	int irq;
> > +
> > +	for_each_irq_desc(irq, desc) {
> > +		unsigned long flags;
> > +		bool sync = false;
> > +
> > +		spin_lock_irqsave(&desc->lock, flags);
> > +
> > +		if (desc->action && !(desc->action->flags & IRQF_TIMER)) {
> > +			if (!desc->depth++) {
> > +				desc->status |= IRQ_DISABLED;
> > +				desc->chip->disable(irq);
> > +				sync = true;
> > +			}
> > +			desc->status |= IRQ_SUSPENDED;
> 
>   This flag needs to be checked in __enable_irq().

[I overlooked this comment, sorry.]

Why does it?

Rafael
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