linux-kernel - Re: [PATCH] PM / Runtime: Add new helper function: pm_runtime

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Date:	Fri, 25 Jan 2013 00:00:43 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	shuox.liu@...el.com
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	pavel@....cz, len.brown@...el.com, yanmin_zhang@...ux.intel.com,
	Yanmin Zhang <yanmin.zhang@...el.com>
Subject: Re: [PATCH] PM / Runtime: Add new helper function: pm_runtime_active()

On Wednesday, January 23, 2013 04:54:01 PM shuox.liu@...el.com wrote:
> From: ShuoX Liu <shuox.liu@...el.com>
> 
> This boolean function simply returns whether or not the runtime
> status of the device is 'active'. The typical scenario is driver
> calls pm_runtime_get firstly, then check pm_runtime_active in
> atomic environment.
> 
> Also add entry to Documentation/power/runtime.txt

Well, why not if that helps.

Applied to linux-pm.git/linux-next.

Thanks,
Rafael


> Signed-off-by: Yanmin Zhang <yanmin.zhang@...el.com>
> Signed-off-by: ShuoX Liu <shuox.liu@...el.com>
> ---
>  Documentation/power/runtime_pm.txt |    4 ++++
>  include/linux/pm_runtime.h         |    7 +++++++
>  2 files changed, 11 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt
> index 03591a7..6c9f5d9 100644
> --- a/Documentation/power/runtime_pm.txt
> +++ b/Documentation/power/runtime_pm.txt
> @@ -426,6 +426,10 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
>        'power.runtime_error' is set or 'power.disable_depth' is greater than
>        zero)
>  
> +  bool pm_runtime_active(struct device *dev);
> +    - return true if the device's runtime PM status is 'active' or its
> +      'power.disable_depth' field is not equal to zero, or false otherwise
> +
>    bool pm_runtime_suspended(struct device *dev);
>      - return true if the device's runtime PM status is 'suspended' and its
>        'power.disable_depth' field is equal to zero, or false otherwise
> diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
> index f271860..c785c21 100644
> --- a/include/linux/pm_runtime.h
> +++ b/include/linux/pm_runtime.h
> @@ -80,6 +80,12 @@ static inline bool pm_runtime_suspended(struct device *dev)
>  		&& !dev->power.disable_depth;
>  }
>  
> +static inline bool pm_runtime_active(struct device *dev)
> +{
> +	return dev->power.runtime_status == RPM_ACTIVE
> +		|| dev->power.disable_depth;
> +}
> +
>  static inline bool pm_runtime_status_suspended(struct device *dev)
>  {
>  	return dev->power.runtime_status == RPM_SUSPENDED;
> @@ -132,6 +138,7 @@ static inline void pm_runtime_put_noidle(struct device *dev) {}
>  static inline bool device_run_wake(struct device *dev) { return false; }
>  static inline void device_set_run_wake(struct device *dev, bool enable) {}
>  static inline bool pm_runtime_suspended(struct device *dev) { return false; }
> +static inline bool pm_runtime_active(struct device *dev) { return true; }
>  static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
>  static inline bool pm_runtime_enabled(struct device *dev) { return false; }
>  
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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