linux-kernel - Re: [patch 3/3] clockevents: Fix resume logic

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Message-Id: <20070512020056.a24cf472.akpm@linux-foundation.org>
Date:	Sat, 12 May 2007 02:00:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	tglx@...utronix.de
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>, linux-acpi@...r.kernel.org
Subject: Re: [patch 3/3] clockevents: Fix resume logic - updated version

On Sat, 12 May 2007 10:46:03 +0200 Thomas Gleixner <tglx@...utronix.de> wrote:

> On Fri, 2007-05-11 at 23:56 -0700, Andrew Morton wrote:
> > On Fri, 11 May 2007 23:09:15 +0200 "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> > 
> > > > > 
> > > > > hm, Fedora don't seem to want to give me an RPM which contains acpidump and
> > > > > all the yum servers are featuring scrogged checksums.  I could build it, I
> > > > > guess, but there's a principle involved ;)
> > > > > 
> > > > > http://userweb.kernel.org/~akpm/dsdt is /proc/acpi/dsdt.  Is that OK?
> > > > 
> > > > Yes, thanks.
> > > 
> > > Hmm, have you tried to do 'echo shutdown > /sys/power/disk' before the
> > > hibernation?
> > 
> > That didn't change the behaviour.
> 
> Andrew,
> 
> can you try the desperate witchcraft patch below ?
> 
> 	tglx
> 
> Index: linux-2.6.21/arch/i386/kernel/apic.c
> ===================================================================
> --- linux-2.6.21.orig/arch/i386/kernel/apic.c
> +++ linux-2.6.21/arch/i386/kernel/apic.c
> @@ -238,9 +238,13 @@ static void lapic_timer_setup(enum clock
>  		break;
>  	case CLOCK_EVT_MODE_UNUSED:
>  	case CLOCK_EVT_MODE_SHUTDOWN:
> -		v = apic_read(APIC_LVTT);
> -		v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
> -		apic_write_around(APIC_LVTT, v);
> +
> +		if (evt->mode == CLOCK_EVT_MODE_PERIODIC ||
> +		    evt->mode == CLOCK_EVT_MODE_ONESHOT) {
> +			v = apic_read(APIC_LVTT);
> +			v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
> +			apic_write_around(APIC_LVTT, v);
> +		}
>  		break;
>  	case CLOCK_EVT_MODE_RESUME:
>  		/* Nothing to do here */
> 

Still hangs in the same fashion, sorry.

It's peculiar that the hang happens when acpi_evaluate_object() hits its
return statement.  Any theories there?
-
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