[PATCH 3/3] amdgpu/dc: Fix missing null checks in amdgpu_dm.c

[Ernst Sjöstrand]

>From smatch:
error: we previously assumed X could be null

Signed-off-by: Ernst Sjöstrand <ernstp at gmail.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 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 2301589e4cc3..d036178c2241 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -432,8 +432,10 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 
 	if (adev->dm.dc)
 		DRM_INFO("Display Core initialized!\n");
-	else
+	else {
 		DRM_INFO("Display Core failed to initialize!\n");
+		goto error;
+	}
 
 	INIT_WORK(&adev->dm.mst_hotplug_work, hotplug_notify_work_func);
 
@@ -2263,7 +2265,7 @@ decide_crtc_timing_for_drm_display_mode(struct drm_display_mode *drm_mode,
 	}
 }
 
-static void create_fake_sink(struct amdgpu_dm_connector *aconnector)
+static int create_fake_sink(struct amdgpu_dm_connector *aconnector)
 {
 	struct dc_sink *sink = NULL;
 	struct dc_sink_init_data sink_init_data = { 0 };
@@ -2272,14 +2274,18 @@ static void create_fake_sink(struct amdgpu_dm_connector *aconnector)
 	sink_init_data.sink_signal = aconnector->dc_link->connector_signal;
 
 	sink = dc_sink_create(&sink_init_data);
-	if (!sink)
+	if (!sink) {
 		DRM_ERROR("Failed to create sink!\n");
+		return -1;
+	}
 
 	sink->sink_signal = SIGNAL_TYPE_VIRTUAL;
 	aconnector->fake_enable = true;
 
 	aconnector->dc_sink = sink;
 	aconnector->dc_link->local_sink = sink;
+
+	return 0;
 }
 
 static struct dc_stream_state *
@@ -2313,7 +2319,8 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 		if (aconnector->mst_port)
 			goto stream_create_fail;
 
-		create_fake_sink(aconnector);
+		if (create_fake_sink(aconnector))
+			goto stream_create_fail;
 	}
 
 	stream = dc_create_stream_for_sink(aconnector->dc_sink);
-- 
2.14.1