This is a note to let you know that I've just added the patch titled
drm/amd/display: Initialize denominators' default to 1
to the 6.11-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-amd-display-initialize-denominators-default-to-1.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 64bd455f93cd63c6ac057a666db587c4aa6d5ebc
Author: Alex Hung <alex.hung@xxxxxxx>
Date: Tue Jun 18 14:05:08 2024 -0600
drm/amd/display: Initialize denominators' default to 1
[ Upstream commit b995c0a6de6c74656a0c39cd57a0626351b13e3c ]
[WHAT & HOW]
Variables used as denominators and maybe not assigned to other values,
should not be 0. Change their default to 1 so they are never 0.
This fixes 10 DIVIDE_BY_ZERO issues reported by Coverity.
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Jerry Zuo <jerry.zuo@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
index 7c56ad0f88122..e7019c95ba79e 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_rq_dlg_calc_20.c
@@ -78,7 +78,7 @@ static void calculate_ttu_cursor(struct display_mode_lib *mode_lib,
static unsigned int get_bytes_per_element(enum source_format_class source_format, bool is_chroma)
{
- unsigned int ret_val = 0;
+ unsigned int ret_val = 1;
if (source_format == dm_444_16) {
if (!is_chroma)
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c b/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c
index dae13f202220e..d8bfc85e5dcd0 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dml1_display_rq_dlg_calc.c
@@ -39,7 +39,7 @@
static unsigned int get_bytes_per_element(enum source_format_class source_format, bool is_chroma)
{
- unsigned int ret_val = 0;
+ unsigned int ret_val = 1;
if (source_format == dm_444_16) {
if (!is_chroma)
diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c
index 81f0a6f19f87b..679b200319034 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c
@@ -9386,8 +9386,8 @@ static void CalculateVMGroupAndRequestTimes(
double TimePerVMRequestVBlank[],
double TimePerVMRequestFlip[])
{
- unsigned int num_group_per_lower_vm_stage = 0;
- unsigned int num_req_per_lower_vm_stage = 0;
+ unsigned int num_group_per_lower_vm_stage = 1;
+ unsigned int num_req_per_lower_vm_stage = 1;
#ifdef __DML_VBA_DEBUG__
dml2_printf("DML::%s: NumberOfActiveSurfaces = %u\n", __func__, NumberOfActiveSurfaces);
