linux-kernel - Re: [PATCH][next] drm/amd/display: fix the return of the uninitialized value in ret

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Message-ID: <CADnq5_Nrg_L+9vFhsxbbeimSvWM2xkD7Og8aARmYGSMUE9rx+Q@mail.gmail.com>
Date:   Tue, 2 Mar 2021 12:51:05 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Harry Wentland <harry.wentland@....com>
Cc:     Colin King <colin.king@...onical.com>, Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Anson Jacob <Anson.Jacob@....com>,
        Mikita Lipski <Mikita.Lipski@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] drm/amd/display: fix the return of the
 uninitialized value in ret

Applied.  Thanks!

Alex

On Tue, Mar 2, 2021 at 10:03 AM Harry Wentland <harry.wentland@....com> wrote:
>
> On 2021-03-02 9:05 a.m., Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > Currently if stream->signal is neither SIGNAL_TYPE_DISPLAY_PORT_MST or
> > SIGNAL_TYPE_DISPLAY_PORT then variable ret is uninitialized and this is
> > checked for > 0 at the end of the function.  Ret should be initialized,
> > I believe setting it to zero is a correct default.
> >
> > Addresses-Coverity: ("Uninitialized scalar variable")
> > Fixes: bd0c064c161c ("drm/amd/display: Add return code instead of boolean for future use")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
>
> Reviewed-by: Harry Wentland <harry.wentland@....com>
>
> Harry
>
> > ---
> >   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > index 5159399f8239..5750818db8f6 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > @@ -530,7 +530,7 @@ bool dm_helpers_dp_write_dsc_enable(
> >   {
> >       uint8_t enable_dsc = enable ? 1 : 0;
> >       struct amdgpu_dm_connector *aconnector;
> > -     uint8_t ret;
> > +     uint8_t ret = 0;
> >
> >       if (!stream)
> >               return false;
> >
> _______________________________________________
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> dri-devel@...ts.freedesktop.org
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