linux-kernel - Re: [PATCH] media: i2c: st-mipid02: correct format propagation

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Date:   Tue, 14 Nov 2023 15:40:46 +0100
From:   Benjamin Mugnier <benjamin.mugnier@...s.st.com>
To:     Alain Volmat <alain.volmat@...s.st.com>,
        Sylvain Petinot <sylvain.petinot@...s.st.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Daniel Scally <dan.scally@...asonboard.com>
CC:     <stable@...r.kernel.org>,
        Jacopo Mondi <jacopo.mondi@...asonboard.com>,
        <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: i2c: st-mipid02: correct format propagation

Hello Alain,

Thanks a lot !

On 11/13/23 15:57, Alain Volmat wrote:
> Use a copy of the struct v4l2_subdev_format when propagating
> format from the sink to source pad in order to avoid impacting the
> sink format returned to the application.
> 
> Thanks to Jacopo Mondi for pointing the issue.

Reviewed-by: Benjamin Mugnier <benjamin.mugnier@...s.st.com>

> Fixes: 6c01e6f3f27b ("media: st-mipid02: Propagate format from sink to source pad")
> Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
> Cc: stable@...r.kernel.org
> ---
>  drivers/media/i2c/st-mipid02.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/st-mipid02.c b/drivers/media/i2c/st-mipid02.c
> index fa27638edc07..dab14787116b 100644
> --- a/drivers/media/i2c/st-mipid02.c
> +++ b/drivers/media/i2c/st-mipid02.c
> @@ -770,6 +770,7 @@ static void mipid02_set_fmt_sink(struct v4l2_subdev *sd,
>  				 struct v4l2_subdev_format *format)
>  {
>  	struct mipid02_dev *bridge = to_mipid02_dev(sd);
> +	struct v4l2_subdev_format source_fmt;
>  	struct v4l2_mbus_framefmt *fmt;
>  
>  	format->format.code = get_fmt_code(format->format.code);
> @@ -781,8 +782,12 @@ static void mipid02_set_fmt_sink(struct v4l2_subdev *sd,
>  
>  	*fmt = format->format;
>  
> -	/* Propagate the format change to the source pad */
> -	mipid02_set_fmt_source(sd, sd_state, format);
> +	/*
> +	 * Propagate the format change to the source pad, taking
> +	 * care not to update the format pointer given back to user
> +	 */
> +	source_fmt = *format;
> +	mipid02_set_fmt_source(sd, sd_state, &source_fmt);
>  }
>  
>  static int mipid02_set_fmt(struct v4l2_subdev *sd,

-- 
Regards,

Benjamin