This is a note to let you know that I've just added the patch titled
drm: Don't treat 0 as -1 in drm_fixp2int_ceil
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-don-t-treat-0-as-1-in-drm_fixp2int_ceil.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a808e6cddaeef4a9f97b10c82e32c00a3f46b7b1
Author: Harry Wentland <harry.wentland@xxxxxxx>
Date: Wed Nov 8 11:36:20 2023 -0500
drm: Don't treat 0 as -1 in drm_fixp2int_ceil
[ Upstream commit cf8837d7204481026335461629b84ac7f4538fa5 ]
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: 64566b5e767f ("drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil")
Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
Reviewed-by: Simon Ser <contact@xxxxxxxxxxx>
Reviewed-by: Melissa Wen <mwen@xxxxxxxxxx>
Signed-off-by: Melissa Wen <melissa.srw@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231108163647.106853-2-harry.wentland@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/drm/drm_fixed.h b/include/drm/drm_fixed.h
index 03cb890690e83..6230088428cdb 100644
--- a/include/drm/drm_fixed.h
+++ b/include/drm/drm_fixed.h
@@ -94,7 +94,7 @@ static inline int drm_fixp2int_round(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);
