linux-kernel - Re: [PATCH v2 2/6] media: imx335: Parse fwnode properties

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Date: Tue, 19 Mar 2024 11:03:35 +0530
From: Umang Jain <umang.jain@...asonboard.com>
To: Tommaso Merciai <tomm.merciai@...il.com>
Cc: linux-media@...r.kernel.org,
 Alexander Shiyan <eagle.alexander923@...il.com>,
 Kieran Bingham <kieran.bingham@...asonboard.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>,
 open list <linux-kernel@...r.kernel.org>,
 Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH v2 2/6] media: imx335: Parse fwnode properties

Hi Tommaso,

On 08/03/24 4:26 pm, Tommaso Merciai wrote:
> Hi Umang, Kieram,
>
> On Fri, Mar 08, 2024 at 02:03:08PM +0530, Umang Jain wrote:
>> From: Kieran Bingham <kieran.bingham@...asonboard.com>
>>
>> Call the V4L2 fwnode device parser to handle controls that are
>> standardised by the framework.
>>
>> Signed-off-by: Kieran Bingham <kieran.bingham@...asonboard.com>
>> Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
>> ---
>>   drivers/media/i2c/imx335.c | 13 ++++++++++++-
>>   1 file changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
>> index 7162b0a3cef3..819ab3a6c5fc 100644
>> --- a/drivers/media/i2c/imx335.c
>> +++ b/drivers/media/i2c/imx335.c
>> @@ -1225,10 +1225,12 @@ static int imx335_init_controls(struct imx335 *imx335)
>>   {
>>   	struct v4l2_ctrl_handler *ctrl_hdlr = &imx335->ctrl_handler;
>>   	const struct imx335_mode *mode = imx335->cur_mode;
>> +	struct v4l2_fwnode_device_properties props;
>>   	u32 lpfr;
>>   	int ret;
>>   
>> -	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 7);
>> +	/* v4l2_fwnode_device_properties can add two more controls */
>> +	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 9);
>>   	if (ret)
>>   		return ret;
>>   
>> @@ -1300,6 +1302,15 @@ static int imx335_init_controls(struct imx335 *imx335)
>>   		return ctrl_hdlr->error;
>>   	}
>>   
>> +	ret = v4l2_fwnode_device_parse(imx335->dev, &props);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &imx335_ctrl_ops,
>> +					      &props);
>> +	if (ret)
>> +		return ret;
>> +
>>   	imx335->sd.ctrl_handler = ctrl_hdlr;
>>   
>>   	return 0;
> Just a doubt on my side.
> We don't need an error path to free ctrl_hdlr?
> Or I'm missing something?

No, you are right.

We need to free the ctrl_hdlr on error patch.
>
> Something similar:
>
> ret = v4l2_fwnode_device_parse(imx335->dev, &props);
> if (ret)
> 	goto free_ctrls;
>
> ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &imx335_ctrl_ops,
> 	                              &props);
> if (ret)
> 	return ret;
>
> free_ctrls:
> 	v4l2_ctrl_handler_free(hdl);
> 	return ret;
>
> Thanks & Regards,
> Tommaso
>
>> -- 
>> 2.43.0
>>
>>