Re: [PATCH 3/3] media: i2c: imx219: Balance runtime PM use-count in resume callback

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Prabhakar,

Thank you for the patch.

On Wed, Mar 10, 2021 at 12:20:14PM +0000, Lad Prabhakar wrote:
> The runtime PM use-count gets incremented in imx219_set_stream() call
> when streaming is started this needs to be balanced by calling
> pm_runtime_put() upon failure to start stream in resume callback.
> 
> Fixes: 1283b3b8f82b9 ("media: i2c: Add driver for Sony IMX219 sensor")
> Reported-by: Pavel Machek <pavel@denx.de>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
>  drivers/media/i2c/imx219.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> index 87c021de1460..afffc85cd265 100644
> --- a/drivers/media/i2c/imx219.c
> +++ b/drivers/media/i2c/imx219.c
> @@ -1184,6 +1184,7 @@ static int __maybe_unused imx219_resume(struct device *dev)
>  {
>  	struct v4l2_subdev *sd = dev_get_drvdata(dev);
>  	struct imx219 *imx219 = to_imx219(sd);
> +	struct i2c_client *client;
>  	int ret;
>  
>  	mutex_lock(&imx219->mutex);
> @@ -1197,7 +1198,9 @@ static int __maybe_unused imx219_resume(struct device *dev)
>  	return 0;
>  
>  error:
> +	client = v4l2_get_subdevdata(&imx219->sd);
>  	imx219_stop_streaming(imx219);
> +	pm_runtime_put(&client->dev);
>  	imx219->streaming = false;
>  	__v4l2_ctrl_grab(imx219->vflip, false);
>  	__v4l2_ctrl_grab(imx219->hflip, false);

Similarly to the __v4l2_ctrl_grab(), it could be better to move
pm_runtime_put() to imx219_stop_streaming().

-- 
Regards,

Laurent Pinchart