linux-kernel - Re: [PATCH] alarmtimer: fix unexpected rtc interrupt when system resume from S3

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Message-ID: <alpine.DEB.2.11.1511041949470.4032@nanos>
Date:	Wed, 4 Nov 2015 19:54:57 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Lee, Zhuo-hao" <zhuo-hao.lee@...el.com>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"zhuohao.lee82@...il.com" <zhuohao.lee82@...il.com>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH] alarmtimer: fix unexpected rtc interrupt when system
 resume from S3

Lee,

On Wed, 4 Nov 2015, Lee, Zhuo-hao wrote:

> Before the system go to suspend (S3), if user create a timer with clockid
> CLOCK_REALTIME_ALARM/CLOCK_BOOTTIME_ALARM and set a "large" timeout value
> to this timer. The function alarmtimer_suspend will be called to setup
> a timeout value to RTC timer to avoid the system sleep over time. However,
> if the system wakeup early than RTC timeout, the RTC timer will not be cleared.
> And this will cause the hpet_rtc_interrupt come unexpectedly until the RTC
> timeout. To fix this problem, just adding alarmtimer_resume to cancel the
> RTC timer.
> 
> Change-Id: I1db3948dd18ad20c25820e27f808da4511ddbf83

Can you please get rid of these Change-Ids? They carry no information
which is useful in the kernel changelogs.

> Signed-off-by: Zhuo-hao Lee <zhuo-hao.lee@...el.com>
> ---
> kernel/time/alarmtimer.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
> 
> diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
> index fe75444..7f7c8ea 100644
> --- a/kernel/time/alarmtimer.c
> +++ b/kernel/time/alarmtimer.c
> @@ -271,11 +271,25 @@ static int alarmtimer_suspend(struct device *dev)
>                                __pm_wakeup_event(ws, MSEC_PER_SEC);
>                return ret;

That patch is white space damaged. Instead of 1 TAB it contains a
random number of spaces. The Documentation directory has explanations
how to setup your mail client proper, or just ask your co-workers.

Other than that, the patch looks correct.

Thanks,

	tglx
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