linux-kernel - Re: [RFC][PATCH 1/2] PM: Split up sysdev_[suspend|resume] from device_power

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Date:	Sun, 22 Feb 2009 22:56:54 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH 1/2] PM: Split up sysdev_[suspend|resume] from
	device_power_[down|up]

On Sun, Feb 22, 2009 at 06:38:50PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Move the sysdev_suspend/resume from the callee to the callers, with
> no real change in semantics, so that we can rework the disabling of
> interrupts during suspend/hibernation.
> 
> This is based on an earlier patch from Linus.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
>...
> --- linux-2.6.orig/arch/x86/kernel/apm_32.c
> +++ linux-2.6/arch/x86/kernel/apm_32.c
> @@ -1192,6 +1192,7 @@ static int suspend(int vetoable)
>  	device_suspend(PMSG_SUSPEND);
>  	local_irq_disable();
>  	device_power_down(PMSG_SUSPEND);
> +	sysdev_suspend(PMSG_SUSPEND);
>  
>  	local_irq_enable();
>  
> @@ -1208,6 +1209,7 @@ static int suspend(int vetoable)
>  	if (err != APM_SUCCESS)
>  		apm_error("suspend", err);
>  	err = (err == APM_SUCCESS) ? 0 : -EIO;
> +	sysdev_resume();
>  	device_power_up(PMSG_RESUME);
>  	local_irq_enable();
>  	device_resume(PMSG_RESUME);
> @@ -1228,6 +1230,7 @@ static void standby(void)
>  
>  	local_irq_disable();
>  	device_power_down(PMSG_SUSPEND);
> +	sysdev_suspend(PMSG_SUSPEND);
>  	local_irq_enable();
>  
>  	err = set_system_power_state(APM_STATE_STANDBY);
> @@ -1235,6 +1238,7 @@ static void standby(void)
>  		apm_error("standby", err);
>  
>  	local_irq_disable();
> +	sysdev_resume();
>  	device_power_up(PMSG_RESUME);
>  	local_irq_enable();
>  }
>...

This causes the following build error with CONFIG_APM=m:

<--  snip  -->

...
  MODPOST 2586 modules
ERROR: "sysdev_resume" [arch/x86/kernel/apm.ko] undefined!
ERROR: "sysdev_suspend" [arch/x86/kernel/apm.ko] undefined!
make[2]: *** [__modpost] Error 1

<--  snip  -->

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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