This is a note to let you know that I've just added the patch titled
drm/amd/display: ASSERT when failing to find index by plane/stream id
to the 6.9-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-assert-when-failing-to-find-index-by.patch
and it can be found in the queue-6.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7af4784170d8e9653c1a74da4cd6bf6a4859fd37
Author: Alex Hung <alex.hung@xxxxxxx>
Date: Mon Apr 22 12:02:17 2024 -0600
drm/amd/display: ASSERT when failing to find index by plane/stream id
[ Upstream commit 01eb50e53c1ce505bf449348d433181310288765 ]
[WHY]
find_disp_cfg_idx_by_plane_id and find_disp_cfg_idx_by_stream_id returns
an array index and they return -1 when not found; however, -1 is not a
valid index number.
[HOW]
When this happens, call ASSERT(), and return a positive number (which is
fewer than callers' array size) instead.
This fixes 4 OVERRUN and 2 NEGATIVE_RETURNS issues reported by Coverity.
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@xxxxxxx>
Acked-by: Wayne Lin <wayne.lin@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@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/dml2/dml2_dc_resource_mgmt.c b/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c
index a52c594e1ba4b..e1f1b5dd13203 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2/dml2_dc_resource_mgmt.c
@@ -88,7 +88,8 @@ static int find_disp_cfg_idx_by_plane_id(struct dml2_dml_to_dc_pipe_mapping *map
return i;
}
- return -1;
+ ASSERT(false);
+ return __DML2_WRAPPER_MAX_STREAMS_PLANES__;
}
static int find_disp_cfg_idx_by_stream_id(struct dml2_dml_to_dc_pipe_mapping *mapping, unsigned int stream_id)
@@ -100,7 +101,8 @@ static int find_disp_cfg_idx_by_stream_id(struct dml2_dml_to_dc_pipe_mapping *ma
return i;
}
- return -1;
+ ASSERT(false);
+ return __DML2_WRAPPER_MAX_STREAMS_PLANES__;
}
// The master pipe of a stream is defined as the top pipe in odm slice 0
