[PATCH 01/34] drm/amd/display: Release fake sink

[Harry Wentland]

From: Mikita Lipski <mikita.lipski at amd.com>

If connector doesn't have a sink, fake sink is created, but
never released as it assumed that its destroyed with the
stream it is used for. But now sink is released before the
stream maintaing refcount consistency.

This way we also avoid assigning anything to connector keeping
all the operation local.

Signed-off-by: Mikita Lipski <mikita.lipski at amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland at amd.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 31 ++++++++++---------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 72f9a4682f50..90f5a842360e 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2358,27 +2358,22 @@ decide_crtc_timing_for_drm_display_mode(struct drm_display_mode *drm_mode,
 	}
 }
 
-static int create_fake_sink(struct amdgpu_dm_connector *aconnector)
+static struct dc_sink *
+create_fake_sink(struct amdgpu_dm_connector *aconnector)
 {
-	struct dc_sink *sink = NULL;
 	struct dc_sink_init_data sink_init_data = { 0 };
-
+	struct dc_sink *sink = NULL;
 	sink_init_data.link = aconnector->dc_link;
 	sink_init_data.sink_signal = aconnector->dc_link->connector_signal;
 
 	sink = dc_sink_create(&sink_init_data);
 	if (!sink) {
 		DRM_ERROR("Failed to create sink!\n");
-		return -ENOMEM;
+		return NULL;
 	}
-
 	sink->sink_signal = SIGNAL_TYPE_VIRTUAL;
-	aconnector->fake_enable = true;
 
-	aconnector->dc_sink = sink;
-	aconnector->dc_link->local_sink = sink;
-
-	return 0;
+	return sink;
 }
 
 static void set_multisync_trigger_params(
@@ -2441,7 +2436,7 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 	struct dc_stream_state *stream = NULL;
 	struct drm_display_mode mode = *drm_mode;
 	bool native_mode_found = false;
-
+	struct dc_sink *sink = NULL;
 	if (aconnector == NULL) {
 		DRM_ERROR("aconnector is NULL!\n");
 		return stream;
@@ -2459,15 +2454,18 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 			return stream;
 		}
 
-		if (create_fake_sink(aconnector))
+		sink = create_fake_sink(aconnector);
+		if (!sink)
 			return stream;
+	} else {
+		sink = aconnector->dc_sink;
 	}
 
-	stream = dc_create_stream_for_sink(aconnector->dc_sink);
+	stream = dc_create_stream_for_sink(sink);
 
 	if (stream == NULL) {
 		DRM_ERROR("Failed to create stream for sink!\n");
-		return stream;
+		goto finish;
 	}
 
 	list_for_each_entry(preferred_mode, &aconnector->base.modes, head) {
@@ -2506,12 +2504,15 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 	fill_audio_info(
 		&stream->audio_info,
 		drm_connector,
-		aconnector->dc_sink);
+		sink);
 
 	update_stream_signal(stream);
 
 	if (dm_state && dm_state->freesync_capable)
 		stream->ignore_msa_timing_param = true;
+finish:
+	if (sink && sink->sink_signal == SIGNAL_TYPE_VIRTUAL)
+		dc_sink_release(sink);
 
 	return stream;
 }
-- 
2.17.0