[Intel-gfx] [PATCH 4/8] drm/i915: fix the "ghost eDP" connector unwind path

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

Because calling intel_dp_destroy inside intel_edp_init_connector is
just wrong. This is the initialization path, so we should properly
unwind all the initialization through the whole caller stack.

On the intel_dp_destroy function we do the following:
1 - Free edid if it exists
2 - Call intel_panel_fini in case it's eDP
3 - Call drm_sysfs_connector_remove
4 - Call drm_connector_cleanup
5 - Free the connector

And here is how we unwind each specific step:
1 - No need as we still didn't assign anything
2 - No need as we still didn't call intel_panel_init
3 - Call it in the same function that called drm_sysfs_connector_add
4 - Call it in the same function that called drm_connector_init
5 - Free it in the same function that allocated it

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c | 4 +++-
 drivers/gpu/drm/i915/intel_dp.c  | 9 ++++++---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 0f835d1..aed363c 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1356,8 +1356,10 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
 	intel_encoder->cloneable = false;
 	intel_encoder->hot_plug = intel_ddi_hot_plug;
 
-	if (!intel_dp_init_connector(intel_dig_port, dp_connector))
+	if (!intel_dp_init_connector(intel_dig_port, dp_connector)) {
+		kfree(dp_connector);
 		return;
+	}
 
 	if (intel_encoder->type != INTEL_OUTPUT_EDP) {
 		hdmi_connector = kzalloc(sizeof(struct intel_connector),
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 46b3e3b..da7460c 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2987,7 +2987,6 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 		/* if this fails, presume the device is a ghost */
 		DRM_INFO("failed to retrieve link info, disabling eDP\n");
 		intel_dp_encoder_destroy(&intel_dig_port->base.base);
-		intel_dp_destroy(connector);
 		return false;
 	}
 
@@ -3146,8 +3145,11 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 
 	intel_dp_i2c_init(intel_dp, intel_connector, name);
 
-	if (!intel_edp_init_connector(intel_dp, intel_connector))
+	if (!intel_edp_init_connector(intel_dp, intel_connector)) {
+		drm_sysfs_connector_remove(connector);
+		drm_connector_cleanup(connector);
 		return false;
+	}
 
 	intel_dp_add_properties(intel_dp, connector);
 
@@ -3206,5 +3208,6 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
 	intel_encoder->cloneable = false;
 	intel_encoder->hot_plug = intel_dp_hot_plug;
 
-	intel_dp_init_connector(intel_dig_port, intel_connector);
+	if (!intel_dp_init_connector(intel_dig_port, intel_connector))
+		kfree(intel_connector);
 }
-- 
1.8.1.2