linux-kernel - Re: [PATCH] media: pvrusb2: fix parsing error

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Message-ID: <CAA5qM4A8oyemT3+B+07KcnvxH274aEzJ+kLd=uB=0dqGFgv+EA@mail.gmail.com>
Date:   Wed, 19 Aug 2020 17:26:56 -0400
From:   Tong Zhang <ztong0001@...il.com>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        mchehab@...nel.org, isely@...ox.com
Subject: Re: [PATCH] media: pvrusb2: fix parsing error

Hi Hans,
I just made another patch as suggested, I think I need some more work
on the commit log.
Please take a look and let me know -
Thanks,
- Tong

On Wed, Aug 19, 2020 at 10:38 AM Hans Verkuil <hverkuil@...all.nl> wrote:
>
> Hi Tong,
>
> On 16/08/2020 08:49, Tong Zhang wrote:
> > pvr2_std_str_to_id() returns 0 on failure and 1 on success,
> > however the caller is checking failure case using <0
> >
> > Signed-off-by: Tong Zhang <ztong0001@...il.com>
> > ---
> >  drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> > index 1cfb7cf64131..db5aa66c1936 100644
> > --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> > +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> > @@ -867,7 +867,8 @@ static int ctrl_std_sym_to_val(struct pvr2_ctrl *cptr,
> >       int ret;
> >       v4l2_std_id id;
> >       ret = pvr2_std_str_to_id(&id,bufPtr,bufSize);
> > -     if (ret < 0) return ret;
> > +     if (ret == 0)
> > +             return ret;
>
> But now you return 0 instead of an error when pvr2_std_str_to_id failed.
>
> Just do this:
>
>         if (!pvr2_std_str_to_id(&id,bufPtr,bufSize))
>                 return -EINVAL;
>
> And you can drop the ret variable as well since that's no longer needed.
>
> Regards,
>
>         Hans
>
> >       if (mskp) *mskp = id;
> >       if (valp) *valp = id;
> >       return 0;
> >
>