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

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Message-Id: <20070509101445.fa6b60cb.akpm@linux-foundation.org>
Date:	Wed, 9 May 2007 10:14:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	tglx@...utronix.de, 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 Wed, 9 May 2007 14:52:07 +0200 "Rafael J. Wysocki" <rjw@...k.pl> wrote:

> > Andrew, could you please apply the appended patch and see if that
> > helps (should apply to -mm2)?
> 
> Argh, sorry.  This needs yet another patch (sent for review to linux-pm) to
> be applied.  The following one is against -mm2:
> 
> ---
> NOTE: This is not a complete solution, because it removes the enabling of GPEs
> from the resume-during-hibernation code path entirely, which probbably is not a
> good idea in general.
> ---
>  kernel/power/disk.c |    1 -
>  1 file changed, 1 deletion(-)
> 
> Index: linux-2.6.21-mm2/kernel/power/disk.c
> ===================================================================
> --- linux-2.6.21-mm2.orig/kernel/power/disk.c
> +++ linux-2.6.21-mm2/kernel/power/disk.c
> @@ -205,7 +205,6 @@ int hibernate(void)
>  
>  	if (in_suspend) {
>  		enable_nonboot_cpus();
> -		platform_finish();
>  		device_resume();
>  		resume_console();
>  		pr_debug("PM: writing image.\n");

It now hangs in a similar fashion in the device_resume() call.

If I back off Thomas's clockevents-fix-resume-logic-updated-version.patch
and include just the above patch the machine does suspend and resume
correctly.

I can delve further into the device_resume() hang if we think it would be
useful.  Maybe Linus's clock-stomping tracer can help here, if I can
remember how to use it.


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