linux-kernel - Re: [RFC PATCH v4 10/12] media: imx219: use a local v4l2

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Date:   Fri, 4 Feb 2022 04:56:06 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jean-Michel Hautbois <jeanmichel.hautbois@...asonboard.com>
Cc:     dave.stevenson@...pberrypi.com, devicetree@...r.kernel.org,
        kernel-list@...pberrypi.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org, lukasz@...y.st,
        mchehab@...nel.org, naush@...pberrypi.com, robh@...nel.org,
        tomi.valkeinen@...asonboard.com, nsaenz@...nel.org,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [RFC PATCH v4 10/12] media: imx219: use a local v4l2_subdev to
 simplify reading

Hi Jean-Michel,

Thank you for the patch.

On Thu, Feb 03, 2022 at 06:50:07PM +0100, Jean-Michel Hautbois wrote:
> There is no need to dereference the imx219 structure. Use a local
> v4l2_subdev instead.
> 
> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@...asonboard.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/media/i2c/imx219.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> index 7d29cf2b06f8..7c224d007f3e 100644
> --- a/drivers/media/i2c/imx219.c
> +++ b/drivers/media/i2c/imx219.c
> @@ -1492,6 +1492,7 @@ static int imx219_check_hwcfg(struct device *dev)
>  static int imx219_probe(struct i2c_client *client)
>  {
>  	struct device *dev = &client->dev;
> +	struct v4l2_subdev *sd;
>  	struct imx219 *imx219;
>  	int ret;
>  
> @@ -1499,7 +1500,8 @@ static int imx219_probe(struct i2c_client *client)
>  	if (!imx219)
>  		return -ENOMEM;
>  
> -	v4l2_i2c_subdev_init(&imx219->sd, client, &imx219_subdev_ops);
> +	sd = &imx219->sd;
> +	v4l2_i2c_subdev_init(sd, client, &imx219_subdev_ops);
>  
>  	/* Check the hardware configuration in device tree */
>  	if (imx219_check_hwcfg(dev))
> @@ -1566,21 +1568,21 @@ static int imx219_probe(struct i2c_client *client)
>  		goto error_power_off;
>  
>  	/* Initialize subdev */
> -	imx219->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
> -			    V4L2_SUBDEV_FL_HAS_EVENTS |
> -			    V4L2_SUBDEV_FL_MULTIPLEXED;
> -	imx219->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
> +		     V4L2_SUBDEV_FL_HAS_EVENTS |
> +		     V4L2_SUBDEV_FL_MULTIPLEXED;
> +	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
>  
>  	/* Initialize source pad */
>  	imx219->pad.flags = MEDIA_PAD_FL_SOURCE;
>  
> -	ret = media_entity_pads_init(&imx219->sd.entity, 1, &imx219->pad);
> +	ret = media_entity_pads_init(&sd->entity, 1, &imx219->pad);
>  	if (ret) {
>  		dev_err(dev, "failed to init entity pads: %d\n", ret);
>  		goto error_handler_free;
>  	}
>  
> -	ret = v4l2_async_register_subdev_sensor(&imx219->sd);
> +	ret = v4l2_async_register_subdev_sensor(sd);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to register sensor sub-device: %d\n", ret);
>  		goto error_media_entity;
> @@ -1594,7 +1596,7 @@ static int imx219_probe(struct i2c_client *client)
>  	return 0;
>  
>  error_media_entity:
> -	media_entity_cleanup(&imx219->sd.entity);
> +	media_entity_cleanup(&sd->entity);
>  
>  error_handler_free:
>  	imx219_free_controls(imx219);

-- 
Regards,

Laurent Pinchart