linux-kernel - Re: [PATCH][next] drm/amd/display: fix for-loop with incorrectly sized loop counter

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Date:   Mon, 27 Jan 2020 15:13:38 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     walter harms <wharms@....de>
Cc:     Colin King <colin.king@...onical.com>,
        kernel-janitors@...r.kernel.org, Leo Li <sunpeng.li@....com>,
        Wenjing Liu <Wenjing.Liu@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Nikola Cornij <Nikola.Cornij@....com>,
        David Airlie <airlied@...ux.ie>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH][next] drm/amd/display: fix for-loop with incorrectly
 sized loop counter

Applied with Walter's comment included.

Thanks!

Alex

On Fri, Jan 17, 2020 at 9:45 AM walter harms <wharms@....de> wrote:
>
>
>
> Am 17.01.2020 14:33, schrieb Colin King:
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > A for-loop is iterating from 0 up to 1000 however the loop variable count
> > is a u8 and hence not large enough.  Fix this by making count an int.
> > Also remove the redundant initialization of count since this is never used
> > and add { } on the loop statement make the loop block clearer.
> >
> > Addresses-Coverity: ("Operands don't affect result")
> > Fixes: ed581a0ace44 ("drm/amd/display: wait for update when setting dpg test pattern")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> >  drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > 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 6ab298c65247..cbed738a4246 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
> > @@ -3680,7 +3680,7 @@ static void set_crtc_test_pattern(struct dc_link *link,
> >                       struct pipe_ctx *odm_pipe;
> >                       enum controller_dp_color_space controller_color_space;
> >                       int opp_cnt = 1;
> > -                     uint8_t count = 0;
> > +                     int count;
> >
> >                       switch (test_pattern_color_space) {
> >                       case DP_TEST_PATTERN_COLOR_SPACE_RGB:
> > @@ -3725,11 +3725,12 @@ static void set_crtc_test_pattern(struct dc_link *link,
> >                               width,
> >                               height);
> >                       /* wait for dpg to blank pixel data with test pattern */
> > -                     for (count = 0; count < 1000; count++)
> > +                     for (count = 0; count < 1000; count++) {
> >                               if (opp->funcs->dpg_is_blanked(opp))
> >                                       break;
> >                               else
> >                                       udelay(100);
> > +                     }
> >               }
> >       }
> >       break;
>
> Nitpick:
> the else is useless you can remove it.
>
> re,
>  wh
>
> _______________________________________________
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> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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