linux-kernel - Re: [PATCH] rtc-cmos: fix suspend/resume

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Message-Id: <201012162205.39435.rjw@sisk.pl>
Date:	Thu, 16 Dec 2010 22:05:39 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Daniel Drake <dsd@...top.org>
Cc:	a.zummo@...ertech.it, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org, pgf@...top.org
Subject: Re: [PATCH] rtc-cmos: fix suspend/resume

On Thursday, December 16, 2010, Daniel Drake wrote:
> From: Paul Fox <pgf@...top.org>
> 
> rtc-cmos was setting suspend/resume hooks at the device_driver level.
> However, the platform bus code (drivers/base/platform.c) only looks
> for resume hooks at the dev_pm_ops level, or within the platform_driver.
> 
> Switch rtc_cmos to use dev_pm_ops so that suspend/resume code is
> executed again.
> 
> Signed-off-by: Paul Fox <pgf@...top.org>
> Signed-off-by: Daniel Drake <dsd@...top.org>
> ---
>  drivers/rtc/rtc-cmos.c |   14 +++++++++-----
>  1 files changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
> index 5856167..dfa5547 100644
> --- a/drivers/rtc/rtc-cmos.c
> +++ b/drivers/rtc/rtc-cmos.c
> @@ -850,7 +850,7 @@ static void __exit cmos_do_remove(struct device *dev)
>  
>  #ifdef	CONFIG_PM
>  
> -static int cmos_suspend(struct device *dev, pm_message_t mesg)
> +static int cmos_suspend(struct device *dev)
>  {
>  	struct cmos_rtc	*cmos = dev_get_drvdata(dev);
>  	unsigned char	tmp;
> @@ -898,7 +898,7 @@ static int cmos_suspend(struct device *dev, pm_message_t mesg)
>   */
>  static inline int cmos_poweroff(struct device *dev)
>  {
> -	return cmos_suspend(dev, PMSG_HIBERNATE);
> +	return cmos_suspend(dev);
>  }
>  
>  static int cmos_resume(struct device *dev)
> @@ -1077,7 +1077,7 @@ static void __exit cmos_pnp_remove(struct pnp_dev *pnp)
>  
>  static int cmos_pnp_suspend(struct pnp_dev *pnp, pm_message_t mesg)
>  {
> -	return cmos_suspend(&pnp->dev, mesg);
> +	return cmos_suspend(&pnp->dev);
>  }
>  
>  static int cmos_pnp_resume(struct pnp_dev *pnp)
> @@ -1152,13 +1152,17 @@ static void cmos_platform_shutdown(struct platform_device *pdev)
>  /* work with hotplug and coldplug */
>  MODULE_ALIAS("platform:rtc_cmos");
>  
> +static struct dev_pm_ops cmos_pm_ops = {
> +	.suspend = cmos_suspend,
> +	.resume = cmos_resume,
> +};

That's not enough.  Please also specify hibernation callbacks as documented
in Documentation/power/devices.txt (they can point to the same routines as the
suspend/resume ones).

Thanks,
Rafael


> +
>  static struct platform_driver cmos_platform_driver = {
>  	.remove		= __exit_p(cmos_platform_remove),
>  	.shutdown	= cmos_platform_shutdown,
>  	.driver = {
>  		.name		= (char *) driver_name,
> -		.suspend	= cmos_suspend,
> -		.resume		= cmos_resume,
> +		.pm = &cmos_pm_ops,
>  	}
>  };
>  
> 

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