drm/i915: propagate errors from intel_dp_init_connector
In case we detect a "ghost eDP", intel_edp_init_connector frees both
the connector and encoder and then returns. On Haswell, intel_ddi_init
then tries to use the freed encoder on the HDMI initialization path
since the following commit:
commit 21a8e6a4853b2ed39fa4c5188a710f2cf1b92026
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed Apr 10 23:28:35 2013 +0200
drm/i915: don't setup hdmi for port D edp in ddi_init
So now on intel_ddi_init we check for the "ghost eDP" case and return
without trying to initialize HDMI. This way we won't try to read the
freed "intel_encoder" struct in the next "if" statement.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Zoltan Nyul <zoltan.nyul@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 224ce25..0f835d1 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1356,7 +1356,8 @@
intel_encoder->cloneable = false;
intel_encoder->hot_plug = intel_ddi_hot_plug;
- intel_dp_init_connector(intel_dig_port, dp_connector);
+ if (!intel_dp_init_connector(intel_dig_port, dp_connector))
+ return;
if (intel_encoder->type != INTEL_OUTPUT_EDP) {
hdmi_connector = kzalloc(sizeof(struct intel_connector),