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

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Message-ID: <20230530174513.GJ22516@pendragon.ideasonboard.com>
Date:   Tue, 30 May 2023 20:45:13 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Yassine Oudjana <yassine.oudjana@...il.com>
Cc:     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>,
        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 Tue, May 30, 2023 at 08:42:30PM +0300, Laurent Pinchart wrote:
> Hi Yassine,
> 
> Thank you for the patch.
> 
> On Wed, May 03, 2023 at 10:53:40AM +0300, 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>
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> This is a regression fix, I'll send a pull request right away.

The patch has actually been applied to the media fixes branch already
:-)

> > ---
> >  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);

-- 
Regards,

Laurent Pinchart