linux-kernel - Re: [PATCH] rtc: disable the alarm in the hardware

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Date:	Tue, 22 Nov 2011 12:32:04 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Rabin Vincent <rabin.vincent@...ricsson.com>, stable@...nel.org
Subject: Re: [PATCH] rtc: disable the alarm in the hardware

On Tue, 2011-11-22 at 11:03 +0100, Linus Walleij wrote:
> From: Rabin Vincent <rabin.vincent@...ricsson.com>
> 
> Currently, the RTC code does not disable the alarm in the hardware.
> 
> This means that after a sequence such as the one below (the files are in the
> RTC sysfs), the box will boot up after 2 minutes even though we've
> asked for the alarm to be turned off.
> 
> 	# echo $((`cat since_epoch`)+120) > wakealarm
> 	# echo 0 > wakealarm
> 	# poweroff
> 
> Fix this by disabling the alarm when there are no timers to run.

Hey Linus,
	Thanks for sending this along! It looks like a good fix to me! I'm a
little amazed this hasn't cropped up sooner.  I'll do some further
testing and then queue it for upstream.

thanks
-john


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