linux-kernel - Re: [update, rev. 6] Re: [PATCH 1/10] PM: Rework handling of interrupts during suspend-resume (rev. 5)

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Date:	Fri, 13 Mar 2009 20:55:13 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Ingo Molnar <mingo@...e.hu>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Len Brown <lenb@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Frans Pop <elendil@...net.nl>,
	Arve Hjønnevåg <arve@...roid.com>
Subject: Re: [update, rev. 6] Re: [PATCH 1/10] PM: Rework handling of interrupts
 during suspend-resume (rev. 5)

On Thu, 12 Mar 2009, Rafael J. Wysocki wrote:
> +/**
> + * 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;
> +
> +		spin_lock_irqsave(&desc->lock, flags);
> +		__disable_irq(desc, irq, true);
> +		spin_unlock_irqrestore(&desc->lock, flags);

Can we move the locking into __disable_irq ?

> +	}
> +
> +	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);

Ditto

Thanks,

	tglx
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