[WHY]
When switching from "Extend" to "Second Display Only" we sometimes
call resource_get_otg_master_for_stream on a stream for the eDP,
which is disconnected. This leads to a null pointer dereference.
[HOW]
Added a null check in dc_resource.c/resource_log_pipe_topology_update.
CC: stable@xxxxxxxxxxxxxxx
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Acked-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
Signed-off-by: Natanel Roizenman <natanel.roizenman@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
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 6831b0151705..bb43c62e959a 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -2302,6 +2302,10 @@ void resource_log_pipe_topology_update(struct dc *dc, struct dc_state *state)
otg_master = resource_get_otg_master_for_stream(
&state->res_ctx, state->streams[stream_idx]);
+
+ if (!otg_master)
+ continue;
+
resource_log_pipe_for_stream(dc, state, otg_master, stream_idx);
}
if (state->phantom_stream_count > 0) {
