linux-kernel - Re: [PATCH 1/2] media: i2c: st_mipid02: cascade s

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Message-ID: <cd0a1ec0-5ab9-dc14-b1ca-c990b062b3c5@xs4all.nl>
Date:   Wed, 19 Jul 2023 12:26:37 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Alain Volmat <alain.volmat@...s.st.com>,
        Benjamin Mugnier <benjamin.mugnier@...s.st.com>,
        Sylvain Petinot <sylvain.petinot@...s.st.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: i2c: st_mipid02: cascade s_stream call to the
 source subdev

On 11/07/2023 14:32, Alain Volmat wrote:
> Cascade the s_stream call to the source subdev whenever the bridge
> streaming is enable / disabled.
> 
> Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
> ---
>  drivers/media/i2c/st-mipid02.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/media/i2c/st-mipid02.c b/drivers/media/i2c/st-mipid02.c
> index 906553a28676..703d2f06f552 100644
> --- a/drivers/media/i2c/st-mipid02.c
> +++ b/drivers/media/i2c/st-mipid02.c
> @@ -547,6 +547,13 @@ static int mipid02_stream_disable(struct mipid02_dev *bridge)
>  	struct i2c_client *client = bridge->i2c_client;
>  	int ret;
>  
> +	if (!bridge->s_subdev)
> +		goto error;

I'm getting this compiler warning:

media-git/drivers/media/i2c/st-mipid02.c: In function 'mipid02_stream_disable':
media-git/drivers/media/i2c/st-mipid02.c:568:12: warning: 'ret' may be used uninitialized [-Wmaybe-uninitialized]
  568 |         if (ret)
      |            ^
media-git/drivers/media/i2c/st-mipid02.c:548:13: note: 'ret' was declared here
  548 |         int ret;
      |             ^~~

I'm dropping this series, waiting for a v2.

Regards,

	Hans

> +
> +	ret = v4l2_subdev_call(bridge->s_subdev, video, s_stream, 0);
> +	if (ret)
> +		goto error;
> +
>  	/* Disable all lanes */
>  	ret = mipid02_write_reg(bridge, MIPID02_CLK_LANE_REG1, 0);
>  	if (ret)
> @@ -633,6 +640,10 @@ static int mipid02_stream_enable(struct mipid02_dev *bridge)
>  	if (ret)
>  		goto error;
>  
> +	ret = v4l2_subdev_call(bridge->s_subdev, video, s_stream, 1);
> +	if (ret)
> +		goto error;
> +
>  	return 0;
>  
>  error: