linux-kernel - Re: REGRESSION 3.2-rcX: RTC auto poweron after 5 minutes

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Message-ID: <20111227105708.GA29960@upset.ux.pdb.fsc.net>
Date:	Tue, 27 Dec 2011 11:57:08 +0100
From:	Andreas Friedrich <afrie@....net>
To:	rabin.vincent@...ricsson.com
Cc:	john.stultz@...aro.org, gregkh@...e.de, torvalds@...l.org,
	Wolfgang Erig <Wolfgang.Erig@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: REGRESSION 3.2-rcX: RTC auto poweron after 5 minutes

On Mo, Dez 26, 2011 at 03:58:41 +0100, Andreas Friedrich wrote:

Hello Rabin,
...
> After shuting down my system (init 0), it powers on automatically
> after 300 seconds!
> 
> I've detected this problem the first time with the stable kernel 3.1.5.
> Bisecting leads me to the following patch:
> 
> "rtc: Disable the alarm in the hardware"
> Stable 3.1.5:     0cbc008c56f7b4a11ba6fe80e196d7ab322baabf
> Mainline 3.2-rcX: c0afabd3d553c521e003779c127143ffde55a16f
...

the 5 minutes auto-poweron problem was caused by the new function
drivers/rtc/interface.c -> rtc_alarm_disable():
   ...
   alarm.time = rtc_ktime_to_tm(ktime_add(rtc_tm_to_ktime(tm),
				        ktime_set(300, 0)));
   alarm.enabled = 0;
   ...

In this function the RTC alarm shall be disabled. Why do you set up a
5 minutes interval just before disabling the alarm?

I have changed
   ktime_set(300, 0)));
to
   ktime_set(0, 0)));
and all worked fine with my notebook.

Please check if this could be a common solution of the problem.

With best regards,
Andreas Friedrich
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