linux-kernel - Re: [PATCH 25/78] media: i2c: ccs-core: use pm_runtime_resume_and

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Message-ID: <20210425185525.GS3@paasikivi.fi.intel.com>
Date:   Sun, 25 Apr 2021 21:55:25 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 25/78] media: i2c: ccs-core: use
 pm_runtime_resume_and_get()

Hi Mauro,

Thanks for the patch.

On Sat, Apr 24, 2021 at 08:44:35AM +0200, Mauro Carvalho Chehab wrote:
> Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> added pm_runtime_resume_and_get() in order to automatically handle
> dev->power.usage_count decrement on errors.
> 
> Use the new API, in order to cleanup the error check logic.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  drivers/media/i2c/ccs/ccs-core.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/i2c/ccs/ccs-core.c b/drivers/media/i2c/ccs/ccs-core.c
> index 9dc3f45da3dc..1441ddcc9b35 100644
> --- a/drivers/media/i2c/ccs/ccs-core.c
> +++ b/drivers/media/i2c/ccs/ccs-core.c
> @@ -1880,12 +1880,11 @@ static int ccs_pm_get_init(struct ccs_sensor *sensor)
>  	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);
>  	int rval;
>  
> -	rval = pm_runtime_get_sync(&client->dev);
> -	if (rval < 0) {
> -		pm_runtime_put_noidle(&client->dev);
> -
> +	rval = pm_runtime_resume_and_get(&client->dev);
> +	if (rval < 0)
>  		return rval;
> -	} else if (!rval) {
> +
> +	if (!rval) {
>  		rval = v4l2_ctrl_handler_setup(&sensor->pixel_array->
>  					       ctrl_handler);
>  		if (rval)
> @@ -3089,7 +3088,7 @@ static int __maybe_unused ccs_suspend(struct device *dev)
>  	bool streaming = sensor->streaming;
>  	int rval;
>  
> -	rval = pm_runtime_get_sync(dev);
> +	rval = pm_runtime_resume_and_get(dev);
>  	if (rval < 0) {
>  		pm_runtime_put_noidle(dev);

You'll need to drop pm_runtime_put_noidle() here.

-- 
Regards,

Sakari Ailus