From: Harry Wentland <harry.wentland@amd.com>
Date: Mon, 28 Apr 2025 20:26:20 +0000 (-0400)
Subject: drm/amd/display: Don't check for NULL divisor in fixpt code
X-Git-Tag: v6.16-rc1~33^2~19^2~33
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=d01ca8708d95a561f6462a15cad94a2c0bec7042;p=linux-block.git

drm/amd/display: Don't check for NULL divisor in fixpt code

[Why]
We check for a NULL divisor but don't act on it.
This check does nothing other than throw a warning.
It does confuse static checkers though:
See https://lkml.org/lkml/2025/4/26/371

[How]
Drop the ASSERTs in both DC and SPL variants.

Fixes: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)")
Fixes: 6efc0ab3b05d ("drm/amd/display: add back quality EASF and ISHARP and dc dependency changes")
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c b/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c
index 88d3f9d7dd55..452206b5095e 100644
--- a/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c
+++ b/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c
@@ -51,8 +51,6 @@ static inline unsigned long long complete_integer_division_u64(
 {
 	unsigned long long result;
 
-	ASSERT(divisor);
-
 	result = div64_u64_rem(dividend, divisor, remainder);
 
 	return result;
@@ -213,9 +211,6 @@ struct fixed31_32 dc_fixpt_recip(struct fixed31_32 arg)
 	 * @note
 	 * Good idea to use Newton's method
 	 */
-
-	ASSERT(arg.value);
-
 	return dc_fixpt_from_fraction(
 		dc_fixpt_one.value,
 		arg.value);
diff --git a/drivers/gpu/drm/amd/display/dc/sspl/spl_fixpt31_32.c b/drivers/gpu/drm/amd/display/dc/sspl/spl_fixpt31_32.c
index 52d97918a3bd..ebf0287417e0 100644
--- a/drivers/gpu/drm/amd/display/dc/sspl/spl_fixpt31_32.c
+++ b/drivers/gpu/drm/amd/display/dc/sspl/spl_fixpt31_32.c
@@ -29,8 +29,6 @@ static inline unsigned long long spl_complete_integer_division_u64(
 {
 	unsigned long long result;
 
-	SPL_ASSERT(divisor);
-
 	result = spl_div64_u64_rem(dividend, divisor, remainder);
 
 	return result;
@@ -196,8 +194,6 @@ struct spl_fixed31_32 spl_fixpt_recip(struct spl_fixed31_32 arg)
 	 * Good idea to use Newton's method
 	 */
 
-	SPL_ASSERT(arg.value);
-
 	return spl_fixpt_from_fraction(
 		spl_fixpt_one.value,
 		arg.value);