linux-kernel - Re: [PATCH 44/78] media: i2c: ov5647: use pm_runtime_resume_and

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Date:   Sat, 24 Apr 2021 10:30:35 +0200
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 44/78] media: i2c: ov5647: use pm_runtime_resume_and_get()

Hi Mauro,

On Sat, Apr 24, 2021 at 08:44:54AM +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>

Looks good, thanks!
Acked-by: Jacopo Mondi <jacopo@...ndi.org>


> ---
>  drivers/media/i2c/ov5647.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
> index 1cefa15729ce..38faa74755e3 100644
> --- a/drivers/media/i2c/ov5647.c
> +++ b/drivers/media/i2c/ov5647.c
> @@ -882,20 +882,20 @@ static int ov5647_s_stream(struct v4l2_subdev *sd, int enable)
>  	}
>
>  	if (enable) {
> -		ret = pm_runtime_get_sync(&client->dev);
> +		ret = pm_runtime_resume_and_get(&client->dev);
>  		if (ret < 0)
>  			goto error_unlock;
>
>  		ret = ov5647_stream_on(sd);
>  		if (ret < 0) {
>  			dev_err(&client->dev, "stream start failed: %d\n", ret);
> -			goto error_unlock;
> +			goto error_pm;
>  		}
>  	} else {
>  		ret = ov5647_stream_off(sd);
>  		if (ret < 0) {
>  			dev_err(&client->dev, "stream stop failed: %d\n", ret);
> -			goto error_unlock;
> +			goto error_pm;
>  		}
>  		pm_runtime_put(&client->dev);
>  	}
> @@ -905,8 +905,9 @@ static int ov5647_s_stream(struct v4l2_subdev *sd, int enable)
>
>  	return 0;
>
> +error_pm:
> +	pm_runtime_put(&client->dev);
>  error_unlock:
> -	pm_runtime_put(&client->dev);
>  	mutex_unlock(&sensor->lock);
>
>  	return ret;
> --
> 2.30.2
>