linux-kernel - Re: [PATCH] PM / wakeirq: report a wakeup

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Date:   Thu, 16 Feb 2017 00:45:56 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Tony Lindgren <tony@...mide.com>
Cc:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Brian Norris <briannorris@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Len Brown <len.brown@...el.com>, Nishanth Menon <nm@...com>,
        Pavel Machek <pavel@....cz>,
        Ulf Hansson <ulf.hansson@...aro.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH] PM / wakeirq: report a wakeup_event on dedicated wekup irq

On Monday, February 13, 2017 12:43:22 PM Tony Lindgren wrote:
> From: Grygorii Strashko <grygorii.strashko@...com>
> 
> There are two reasons for reporting wakeup event when dedicated wakeup
> IRQ is triggered:
> 
> - wakeup events accounting, so proper statistical data will be
>   displayed in sysfs and debugfs;
> 
> - there are small window when System is entering suspend during which
>   dedicated wakeup IRQ can be lost:
> 
> dpm_suspend_noirq()
>   |- device_wakeup_arm_wake_irqs()
>       |- dev_pm_arm_wake_irq(X)
>          |- IRQ is enabled and marked as wakeup source
> [1]...
>   |- suspend_device_irqs()
>      |- suspend_device_irq(X)
> 	|- irqd_set(X, IRQD_WAKEUP_ARMED);
> 	   |- wakup IRQ armed
> 
> The wakeup IRQ can be lost if it's triggered at point [1]
> and not armed yet.
> 
> Hence, fix above cases by adding simple pm_wakeup_event() call in
> handle_threaded_wake_irq().
> 
> Fixes: 4990d4fe327b ("PM / Wakeirq: Add automated device wake IRQ
> handling")
> Cc: Brian Norris <briannorris@...omium.org>
> Cc: Tero Kristo <t-kristo@...com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> Tested-by: Keerthy <j-keerthy@...com>
> [tony@...mide.com: added missing return to avoid warnings]
> Tested-by: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Tony Lindgren <tony@...mide.com>

Applied (along with the other two wakeirq fixes).

Thanks,
Rafael