[PATCH][next] drm/amd/display: fix for-loop with incorrectly sized loop counter
Alex Deucher
alexdeucher at gmail.com
Mon Jan 27 20:13:38 UTC 2020
Applied with Walter's comment included.
Thanks!
Alex
On Fri, Jan 17, 2020 at 9:45 AM walter harms <wharms at bfs.de> wrote:
>
>
>
> Am 17.01.2020 14:33, schrieb Colin King:
> > From: Colin Ian King <colin.king at canonical.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 at canonical.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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