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References: <20210617023109.204591-1-pulehui@huawei.com> <fa86062f-cb45-245b-1bf0-494ffcd33908@amd.com>
In-Reply-To: <fa86062f-cb45-245b-1bf0-494ffcd33908@amd.com>
From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Fri, 18 Jun 2021 16:33:25 -0400
Message-ID: <CADnq5_OOQqWf9yTcSwN=U8+1VbyfD-f_RfhQ+Gura_BJkspZmg@mail.gmail.com>
Subject: Re: [PATCH -next] drm/amd/display: Fix gcc unused variable warning
To:     Harry Wentland <harry.wentland@amd.com>
Cc:     Pu Lehui <pulehui@huawei.com>,
        "Leo (Sunpeng) Li" <sunpeng.li@amd.com>,
        "Deucher, Alexander" <alexander.deucher@amd.com>,
        Christian Koenig <christian.koenig@amd.com>,
        xinhui pan <Xinhui.Pan@amd.com>,
        Dave Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>, Jun Lei <Jun.Lei@amd.com>,
        Wenjing Liu <wenjing.liu@amd.com>,
        Anson Jacob <Anson.Jacob@amd.com>,
        Qingqing Zhuo <qingqing.zhuo@amd.com>,
        Wesley Chalmers <Wesley.Chalmers@amd.com>,
        Jimmy.Kizito@amd.com, "Cyr, Aric" <aric.cyr@amd.com>,
        Martin Tsai <martin.tsai@amd.com>,
        jinlong zhang <jinlong.zhang@amd.com>, zhangjinhao2@huawei.com,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>
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Applied.  Thanks!

Alex

On Thu, Jun 17, 2021 at 2:43 PM Harry Wentland <harry.wentland@amd.com> wro=
te:
>
> On 2021-06-16 10:31 p.m., Pu Lehui wrote:
> > GCC reports the following warning with W=3D1:
> >
> > drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:3635:17:
> > warning:
> >  variable =E2=80=98status=E2=80=99 set but not used [-Wunused-but-set-v=
ariable]
> >   3635 |  enum dc_status status =3D DC_ERROR_UNEXPECTED;
> >        |                 ^~~~~~
> >
> > The variable should be used for error check, let's fix it.
> >
> > Signed-off-by: Pu Lehui <pulehui@huawei.com>
>
> Reviewed-by: Harry Wentland <harry.wentland@amd.com>
>
> Harry
>
> > ---
> >  drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers=
/gpu/drm/amd/display/dc/core/dc_link_dp.c
> > index fcb635c85330..cf29265870c8 100644
> > --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> > +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> > @@ -3681,6 +3681,10 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link)
> >                               DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STR=
UCTURE_REV,
> >                               lttpr_dpcd_data,
> >                               sizeof(lttpr_dpcd_data));
> > +             if (status !=3D DC_OK) {
> > +                     dm_error("%s: Read LTTPR caps data failed.\n", __=
func__);
> > +                     return false;
> > +             }
> >
> >               link->dpcd_caps.lttpr_caps.revision.raw =3D
> >                               lttpr_dpcd_data[DP_LT_TUNABLE_PHY_REPEATE=
R_FIELD_DATA_STRUCTURE_REV -
> >
>
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