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drm: Don't treat 0 as -1 in drm_fixp2int_ceil 

[ Upstream commit cf8837d720 ]

Unit testing this in VKMS shows that passing 0 into
this function returns -1, which is highly counter-
intuitive. Fix it by checking whether the input is
>= 0 instead of > 0.

Fixes: 64566b5e76 ("drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil")
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231108163647.106853-2-harry.wentland@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Harry Wentland 2023-11-08 11:36:20 -05:00 committed by Sasha Levin
parent fbb37b3977
commit 2cb881069e
1 changed files with 1 additions and 1 deletions
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2
include/drm/drm_fixed.h
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@ -88,7 +88,7 @@ static inline int drm_fixp2int(s64 a)
static inline int drm_fixp2int_ceil(s64 a)
{
if (a > 0)
if (a >= 0)
return drm_fixp2int(a + DRM_FIXED_ALMOST_ONE);
else
return drm_fixp2int(a - DRM_FIXED_ALMOST_ONE);