Re: [PATCH V2] PM / Qos: Ensure device not in PRM_SUSPENDED when pm qos flags request functions are invoked in the pm core.

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Thursday, November 08, 2012 11:14:08 AM Lan Tianyu wrote:
> Since dev_pm_qos_add_request(), dev_pm_qos_update_request() and
> dev_pm_qos_remove_request() for pm qos flags should not be invoked
> when device in RPM_SUSPENDED. Add pm_runtime_get_sync() and pm_runtime_put()
> around these functions in the pm core to ensure device not in RPM_SUSPENDED.
> 
> Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>

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

Thanks,
Rafael


> ---
> Change since v1:
> 	Remove unnecessary pm_runtime_get_sync() and pm_runtime_put()
> around dev_pm_qos_update_flags().
> ---
>  drivers/base/power/qos.c |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
> index 081db2d..fdc3894 100644
> --- a/drivers/base/power/qos.c
> +++ b/drivers/base/power/qos.c
> @@ -633,15 +633,18 @@ int dev_pm_qos_expose_flags(struct device *dev, s32 val)
>  	if (!req)
>  		return -ENOMEM;
>  
> +	pm_runtime_get_sync(dev);
>  	ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_FLAGS, val);
>  	if (ret < 0)
> -		return ret;
> +		goto fail;
>  
>  	dev->power.qos->flags_req = req;
>  	ret = pm_qos_sysfs_add_flags(dev);
>  	if (ret)
>  		__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);
>  
> +fail:
> +	pm_runtime_put(dev);
>  	return ret;
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_qos_expose_flags);
> @@ -654,7 +657,9 @@ void dev_pm_qos_hide_flags(struct device *dev)
>  {
>  	if (dev->power.qos && dev->power.qos->flags_req) {
>  		pm_qos_sysfs_remove_flags(dev);
> +		pm_runtime_get_sync(dev);
>  		__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);
> +		pm_runtime_put(dev);
>  	}
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_qos_hide_flags);
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.