Re: [RFC PATCH] rtc: keep system awake until all expired RTC timersare handled

[John Stultz]

On 06/26/2013 04:09 PM, Zoran Markovic wrote:
> Current implementation of RTC interface allows for system suspend to
> occur in the following cases:
> (a) if a timer is set in the past and rtc_timer_do_work() is scheduled
> to handle it, and
> (b) if rtc_timer_do_work() is called to handle expired timers whose
> handlers implement a preemption point.
>
> A pending suspend request may be honoured in the above cases causing
> timer handling to be delayed until after the next resume. This is
> undesirable since timer handlers may have time-critical code to execute.
>
> This patch makes sure that the system stays awake until all expired
> timers are handled.
>
> Note that all calls to pm_stay_awake() are eventually paired with
> the single pm_relax() call in rtc_timer_do_work(), which is launched
> using schedule_work().
>
> Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
> Cc: John Stultz <john.stultz@xxxxxxxxxx>
> Cc: Arve Hjonnevag <arve@xxxxxxxxxxx>
> Cc: Todd Poynor <toddpoynor@xxxxxxxxxx>
> Signed-off-by: Zoran Markovic <zoran.markovic@xxxxxxxxxx>

Haven't seen any objections here, so I'll queue this for 3.12.

thanks
-john

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