linux-kernel - Re: [PATCH v5] Report interrupt(s) that caused system wakeup

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Date:	Tue, 18 Aug 2015 17:53:54 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alexandra Yates <alexandra.yates@...ux.intel.com>,
	Kristen C Accardi <kristen.c.accardi@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] Report interrupt(s) that caused system wakeup

On Tue, Aug 18, 2015 at 2:56 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Tue, 18 Aug 2015, Rafael J. Wysocki wrote:
>> The original point was that if two wakeup interrupts happened at the same time,
>> it would be kind of moot which one was the "real" wakeup, but now that I think
>> about it, reporting the first one should be enough to catch suprious wakeups
>> anyway.
>
> So we can simply do the following:
>
> diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
> index d22786a6dbde..46068a1e0e07 100644
> --- a/kernel/irq/pm.c
> +++ b/kernel/irq/pm.c
> @@ -21,7 +21,7 @@ bool irq_pm_check_wakeup(struct irq_desc *desc)
>                 desc->istate |= IRQS_SUSPENDED | IRQS_PENDING;
>                 desc->depth++;
>                 irq_disable(desc);
> -               pm_system_wakeup();
> +               pm_system_irq_wakeup(irq_desc_get_irq(desc));
>                 return true;
>         }
>         return false;
>
> and manage the storage in the PM code.

Right.

That's exactly the approach we're going to follow. :-)

Thanks,
Rafael
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