[PATCH V2 1/2] drm/amd/display: use pre-allocated temp structure for bounding box

[Alex Deucher]

This mirrors what the driver does for older DCN generations.

Should fix:

BUG: sleeping function called from invalid context at include/linux/sched/mm.h:306
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 449, name: kworker/u64:8
preempt_count: 2, expected: 0
RCU nest depth: 0, expected: 0
Preemption disabled at:
ffffffffc0ce1580>] dc_fpu_begin+0x30/0xd0 [amdgpu]
CPU: 5 PID: 449 Comm: kworker/u64:8 Tainted: G        W          6.8.0+ #35
Hardware name: System manufacturer System Product Name/ROG STRIX X570-E GAMING WIFI II, BIOS 4204 02/24/2022
Workqueue: events_unbound async_run_entry_fn

v2: drop extra memcpy

Fixes: 88c61827cedc ("drm/amd/display: dynamically allocate dml2_configuration_options structures")
Tested-by: George Zhang <George.zhang at amd.com> (v1)
Suggested-by: Hamza Mahfooz <hamza.mahfooz at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: George Zhang <george.zhang at amd.com>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: harry.wentland at amd.com
Cc: sunpeng.li at amd.com
Cc: Rodrigo.Siqueira at amd.com
---
 drivers/gpu/drm/amd/display/dc/dc.h                       | 1 +
 .../drm/amd/display/dc/resource/dcn32/dcn32_resource.c    | 8 ++------
 .../drm/amd/display/dc/resource/dcn321/dcn321_resource.c  | 8 ++------
 3 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index d0ed01ac460d..d843933ad731 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -1444,6 +1444,7 @@ struct dc {
 	} scratch;
 
 	struct dml2_configuration_options dml2_options;
+	struct dml2_configuration_options dml2_tmp;
 	enum dc_acpi_cm_power_state power_state;
 
 };
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
index 0f11d7c8791c..e33e2597847e 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c
@@ -2007,11 +2007,9 @@ void dcn32_calculate_wm_and_dlg(struct dc *dc, struct dc_state *context,
 
 static void dcn32_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_params)
 {
-	struct dml2_configuration_options *dml2_opt;
+	struct dml2_configuration_options *dml2_opt = &dc->dml2_tmp;
 
-	dml2_opt = kmemdup(&dc->dml2_options, sizeof(dc->dml2_options), GFP_KERNEL);
-	if (!dml2_opt)
-		return;
+	memcpy(dml2_opt, &dc->dml2_options, sizeof(dc->dml2_options));
 
 	DC_FP_START();
 
@@ -2026,8 +2024,6 @@ static void dcn32_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw
 		dml2_reinit(dc, dml2_opt, &dc->current_state->bw_ctx.dml2_dc_power_source);
 
 	DC_FP_END();
-
-	kfree(dml2_opt);
 }
 
 static struct resource_funcs dcn32_res_pool_funcs = {
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c
index 07ca6f58447d..9a3cc0514a36 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn321/dcn321_resource.c
@@ -1581,11 +1581,9 @@ static struct dc_cap_funcs cap_funcs = {
 
 static void dcn321_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_params)
 {
-	struct dml2_configuration_options *dml2_opt;
+	struct dml2_configuration_options *dml2_opt = &dc->dml2_tmp;
 
-	dml2_opt = kmemdup(&dc->dml2_options, sizeof(dc->dml2_options), GFP_KERNEL);
-	if (!dml2_opt)
-		return;
+	memcpy(dml2_opt, &dc->dml2_options, sizeof(dc->dml2_options));
 
 	DC_FP_START();
 
@@ -1600,8 +1598,6 @@ static void dcn321_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *b
 		dml2_reinit(dc, dml2_opt, &dc->current_state->bw_ctx.dml2_dc_power_source);
 
 	DC_FP_END();
-
-	kfree(dml2_opt);
 }
 
 static struct resource_funcs dcn321_res_pool_funcs = {
-- 
2.45.1