linux-kernel - Re: [PATCH] media: camss: camss-video: Don't zero subdev format again after initialization

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Message-ID: <9db2ff70-d513-9e63-834c-64e448f9babb@linaro.org>
Date:   Mon, 22 May 2023 16:51:03 +0300
From:   Andrey Konovalov <andrey.konovalov@...aro.org>
To:     Yassine Oudjana <yassine.oudjana@...il.com>,
        Robert Foss <rfoss@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Lad Prabhakar <prabhakar.csengg@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Yassine Oudjana <y.oudjana@...tonmail.com>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: camss: camss-video: Don't zero subdev format again
 after initialization


On 03.05.2023 10:53, Yassine Oudjana wrote:
> From: Yassine Oudjana <y.oudjana@...tonmail.com>
> 
> In an earlier commit, setting the which field of the subdev format struct
> in video_get_subdev_format was moved to a designated initializer that also
> zeroes all other fields. However, the memset call that was zeroing the
> fields earlier was left in place, causing the which field to be cleared
> after being set in the initializer.
> 
> Remove the memset call from video_get_subdev_format to avoid clearing the
> initialized which field.
> 
> Fixes: ecefa105cc44 ("media: Zero-initialize all structures passed to subdev pad operations")
> Signed-off-by: Yassine Oudjana <y.oudjana@...tonmail.com>
> ---
>   drivers/media/platform/qcom/camss/camss-video.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-video.c b/drivers/media/platform/qcom/camss/camss-video.c
> index 898f32177b12..8640db306026 100644
> --- a/drivers/media/platform/qcom/camss/camss-video.c
> +++ b/drivers/media/platform/qcom/camss/camss-video.c
> @@ -353,7 +353,6 @@ static int video_get_subdev_format(struct camss_video *video,
>   	if (subdev == NULL)
>   		return -EPIPE;
>   
> -	memset(&fmt, 0, sizeof(fmt));
>   	fmt.pad = pad;
>   
>   	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);

Have verified that this fix does work on RB3 and RB5 boards and is 
necessary for the capture to work.

Thanks!

Tested-by: Andrey Konovalov <andrey.konovalov@...aro.org>