linux-kernel - Re: [patch 2.6.26-git] pm selftest: rtc paranoia

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Date:	Fri, 25 Jul 2008 14:49:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [patch 2.6.26-git] pm selftest:  rtc paranoia

On Fri, 25 Jul 2008 13:26:51 -0700
David Brownell <david-b@...bell.net> wrote:

> From: David Brownell <dbrownell@...rs.sourceforge.net>
> 
> Cope with a quirk of some RTCs (notably ACPI ones) which
> aren't guaranteed to implement oneshot behavior when they
> woke the system from sleeep:  forcibly disable the alarm,
> just in case.
> 
> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
> ---
>  kernel/power/main.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> --- a/kernel/power/main.c	2008-07-22 16:38:32.000000000 -0700
> +++ b/kernel/power/main.c	2008-07-22 16:39:15.000000000 -0700
> @@ -635,6 +635,13 @@ static void __init test_wakealarm(struct
>  	}
>  	if (status < 0)
>  		printk(err_suspend, status);
> +
> +	/* Some platforms can't detect that the alarm triggered the
> +	 * wakeup, or (accordingly) disable it after it afterwards.
> +	 * It's supposed to give oneshot behavior; cope.
> +	 */
> +	alm.enabled = false;
> +	rtc_set_alarm(rtc, &alm);
>  }
>  
>  static int __init has_wakealarm(struct device *dev, void *name_ptr)

I assume this fixes some reported bug?  Any references?

Is this needed in 2.6.26.x?  2.6.25.x?
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