linux-kernel - Re: [PATCH] drm/amd/pm: fix error handling

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Date:   Mon, 7 Feb 2022 16:15:44 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     "Quan, Evan" <Evan.Quan@....com>
Cc:     "trix@...hat.com" <trix@...hat.com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "nathan@...nel.org" <nathan@...nel.org>,
        "ndesaulniers@...gle.com" <ndesaulniers@...gle.com>,
        "Lazar, Lijo" <Lijo.Lazar@....com>,
        "Powell, Darren" <Darren.Powell@....com>,
        "Chen, Guchun" <Guchun.Chen@....com>,
        "Grodzovsky, Andrey" <Andrey.Grodzovsky@....com>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amd/pm: fix error handling

Applied.  Thanks!

Alex

On Sun, Feb 6, 2022 at 10:04 PM Quan, Evan <Evan.Quan@....com> wrote:
>
> [AMD Official Use Only]
>
> Reviewed-by: Evan Quan <evan.quan@....com>
>
> > -----Original Message-----
> > From: trix@...hat.com <trix@...hat.com>
> > Sent: Saturday, February 5, 2022 11:00 PM
> > To: Quan, Evan <Evan.Quan@....com>; Deucher, Alexander
> > <Alexander.Deucher@....com>; Koenig, Christian
> > <Christian.Koenig@....com>; Pan, Xinhui <Xinhui.Pan@....com>;
> > airlied@...ux.ie; daniel@...ll.ch; nathan@...nel.org;
> > ndesaulniers@...gle.com; Lazar, Lijo <Lijo.Lazar@....com>; Powell, Darren
> > <Darren.Powell@....com>; Chen, Guchun <Guchun.Chen@....com>;
> > Grodzovsky, Andrey <Andrey.Grodzovsky@....com>
> > Cc: amd-gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-
> > kernel@...r.kernel.org; llvm@...ts.linux.dev; Tom Rix <trix@...hat.com>
> > Subject: [PATCH] drm/amd/pm: fix error handling
> >
> > From: Tom Rix <trix@...hat.com>
> >
> > clang static analysis reports this error
> > amdgpu_smu.c:2289:9: warning: Called function pointer
> >   is null (null dereference)
> >         return smu->ppt_funcs->emit_clk_levels(
> >                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > There is a logic error in the earlier check of
> > emit_clk_levels.  The error value is set to
> > the ret variable but ret is never used.  Return
> > directly and remove the unneeded ret variable.
> >
> > Fixes: 5d64f9bbb628 ("amdgpu/pm: Implement new API function "emit" that
> > accepts buffer base and write offset")
> > Signed-off-by: Tom Rix <trix@...hat.com>
> > ---
> >  drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> > b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> > index af368aa1fd0ae..5f3b3745a9b7a 100644
> > --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> > +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> > @@ -2274,7 +2274,6 @@ static int smu_emit_ppclk_levels(void *handle,
> > enum pp_clock_type type, char *bu
> >  {
> >       struct smu_context *smu = handle;
> >       enum smu_clk_type clk_type;
> > -     int ret = 0;
> >
> >       clk_type = smu_convert_to_smuclk(type);
> >       if (clk_type == SMU_CLK_COUNT)
> > @@ -2284,7 +2283,7 @@ static int smu_emit_ppclk_levels(void *handle,
> > enum pp_clock_type type, char *bu
> >               return -EOPNOTSUPP;
> >
> >       if (!smu->ppt_funcs->emit_clk_levels)
> > -             ret = -ENOENT;
> > +             return -ENOENT;
> >
> >       return smu->ppt_funcs->emit_clk_levels(smu, clk_type, buf, offset);
> >
> > --
> > 2.26.3