linux-kernel - Re: [PATCH 1/1] acer-wmi: switch driver to dev_pm

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Date:	Sat, 25 Jul 2009 10:43:12 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Arnaud Faucher <arnaud.faucher@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-kernel@...r.kernel.org,
	Carlos Corbacho <carlos@...angeworlds.co.uk>
Subject: Re: [PATCH 1/1] acer-wmi: switch driver to dev_pm_ops

Hi Arnaud,

On Sat, Jul 25, 2009 at 09:04:51AM -0400, Arnaud Faucher wrote:
> Gets rid of the following warning:
> Platform driver 'acer-wmi' needs updating - please use dev_pm_ops
> 

Have you tested it with Suspend to disk? You are [potentially] breaking
it since the new suspend and resume methods are not used by it, it calls
freeze() and thaw() instead.

Rafael,

I wonder if PM core should automatically use suspend()/resume() in place of
freeze()/thaw() when the latter pair is missing.

> Signed-off-by: Arnaud Faucher <arnaud.faucher@...il.com>
> ---
>  drivers/platform/x86/acer-wmi.c |   13 ++++++++-----
>  1 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
> index be2fd6f..b2b6aef 100644
> --- a/drivers/platform/x86/acer-wmi.c
> +++ b/drivers/platform/x86/acer-wmi.c
> @@ -1152,8 +1152,7 @@ static int acer_platform_remove(struct platform_device *device)
>  	return 0;
>  }
>  
> -static int acer_platform_suspend(struct platform_device *dev,
> -pm_message_t state)
> +static int acer_platform_suspend(struct device *dev)
>  {
>  	u32 value;
>  	struct acer_data *data = &interface->data;
> @@ -1174,7 +1173,7 @@ pm_message_t state)
>  	return 0;
>  }
>  
> -static int acer_platform_resume(struct platform_device *device)
> +static int acer_platform_resume(struct device *dev)
>  {
>  	struct acer_data *data = &interface->data;
>  
> @@ -1190,15 +1189,19 @@ static int acer_platform_resume(struct platform_device *device)
>  	return 0;
>  }
>  
> +static struct dev_pm_ops acer_platform_pm_ops = {
> +	.suspend = acer_platform_suspend,
> +	.resume = acer_platform_resume,
> +};
> +
>  static struct platform_driver acer_platform_driver = {
>  	.driver = {
>  		.name = "acer-wmi",
>  		.owner = THIS_MODULE,
> +		.pm = &acer_platform_pm_ops,
>  	},
>  	.probe = acer_platform_probe,
>  	.remove = acer_platform_remove,
> -	.suspend = acer_platform_suspend,
> -	.resume = acer_platform_resume,
>  };
>  
>  static struct platform_device *acer_platform_device;
> -- 
> 1.6.3.3
> 
> --
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-- 
Dmitry
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