This is a note to let you know that I've just added the patch titled
drm/amd/display: Fix NULL pointer dereference at hibernate
to the 6.7-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-fix-null-pointer-dereference-at-hibe.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 01f6878f0c94e642eb4e03f493fc468ec010d980
Author: Mario Limonciello <mario.limonciello@xxxxxxx>
Date: Tue Nov 28 18:35:09 2023 -0600
drm/amd/display: Fix NULL pointer dereference at hibernate
[ Upstream commit b719a9c15d52d4f56bdea8241a5d90fd9197ce99 ]
During hibernate sequence the source context might not have a clk_mgr.
So don't use it to look for DML2 support.
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2980
Fixes: 7966f319c66d ("drm/amd/display: Introduce DML2")
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@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/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index a1f1d1003992..e4bb1e25ee3b 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -4512,7 +4512,7 @@ void dc_resource_state_copy_construct(
struct dml2_context *dml2 = NULL;
// Need to preserve allocated dml2 context
- if (src_ctx->clk_mgr->ctx->dc->debug.using_dml2)
+ if (src_ctx->clk_mgr && src_ctx->clk_mgr->ctx->dc->debug.using_dml2)
dml2 = dst_ctx->bw_ctx.dml2;
#endif
@@ -4520,7 +4520,7 @@ void dc_resource_state_copy_construct(
#ifdef CONFIG_DRM_AMD_DC_FP
// Preserve allocated dml2 context
- if (src_ctx->clk_mgr->ctx->dc->debug.using_dml2)
+ if (src_ctx->clk_mgr && src_ctx->clk_mgr->ctx->dc->debug.using_dml2)
dst_ctx->bw_ctx.dml2 = dml2;
#endif
