drm/i915: don't leak dp_connector at intel_ddi_init

Regression introduced by:
    commit 311a2094
    Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
        drm/i915: don't init DP or HDMI when not supported by DDI port

Since the commit above it is possible to have a DDI encoder that has
the HDMI connector but not the DP connector (in case the port doesn't
support DP). In this case, we must properly free the DP connector.

We just leak this once, so it's not a big deal.

Reported by kmemleak.
Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_ddi.c

@@ -1345,6 +1345,41 @@ static const struct drm_encoder_funcs intel_ddi_funcs = {
 	.destroy = intel_ddi_destroy,
 };
 
+static struct intel_connector *
+intel_ddi_init_dp_connector(struct intel_digital_port *intel_dig_port)
+{
+	struct intel_connector *connector;
+	enum port port = intel_dig_port->port;
+
+	connector = kzalloc(sizeof(*connector), GFP_KERNEL);
+	if (!connector)
+		return NULL;
+
+	intel_dig_port->dp.output_reg = DDI_BUF_CTL(port);
+	if (!intel_dp_init_connector(intel_dig_port, connector)) {
+		kfree(connector);
+		return NULL;
+	}
+
+	return connector;
+}
+
+static struct intel_connector *
+intel_ddi_init_hdmi_connector(struct intel_digital_port *intel_dig_port)
+{
+	struct intel_connector *connector;
+	enum port port = intel_dig_port->port;
+
+	connector = kzalloc(sizeof(*connector), GFP_KERNEL);
+	if (!connector)
+		return NULL;
+
+	intel_dig_port->hdmi.hdmi_reg = DDI_BUF_CTL(port);
+	intel_hdmi_init_connector(intel_dig_port, connector);
+
+	return connector;
+}
+
 void intel_ddi_init(struct drm_device *dev, enum port port)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1369,12 +1404,6 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
 	if (!intel_dig_port)
 		return;
 
-	dp_connector = kzalloc(sizeof(*dp_connector), GFP_KERNEL);
-	if (!dp_connector) {
-		kfree(intel_dig_port);
-		return;
-	}
-
 	intel_encoder = &intel_dig_port->base;
 	encoder = &intel_encoder->base;
 
@@ -1394,29 +1423,22 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
 	intel_dig_port->saved_port_bits = I915_READ(DDI_BUF_CTL(port)) &
 					  (DDI_BUF_PORT_REVERSAL |
 					   DDI_A_4_LANES);
-	intel_dig_port->dp.output_reg = DDI_BUF_CTL(port);
 
 	intel_encoder->type = INTEL_OUTPUT_UNKNOWN;
 	intel_encoder->crtc_mask =  (1 << 0) | (1 << 1) | (1 << 2);
 	intel_encoder->cloneable = false;
 	intel_encoder->hot_plug = intel_ddi_hot_plug;
 
-	if (init_dp && !intel_dp_init_connector(intel_dig_port, dp_connector)) {
-		drm_encoder_cleanup(encoder);
-		kfree(intel_dig_port);
-		kfree(dp_connector);
-		return;
-	}
+	if (init_dp)
+		dp_connector = intel_ddi_init_dp_connector(intel_dig_port);
 
 	/* In theory we don't need the encoder->type check, but leave it just in
 	 * case we have some really bad VBTs... */
-	if (intel_encoder->type != INTEL_OUTPUT_EDP && init_hdmi) {
-		hdmi_connector = kzalloc(sizeof(*hdmi_connector),
-					 GFP_KERNEL);
-		if (!hdmi_connector)
-			return;
+	if (intel_encoder->type != INTEL_OUTPUT_EDP && init_hdmi)
+		hdmi_connector = intel_ddi_init_hdmi_connector(intel_dig_port);
 
-		intel_dig_port->hdmi.hdmi_reg = DDI_BUF_CTL(port);
-		intel_hdmi_init_connector(intel_dig_port, hdmi_connector);
+	if (!dp_connector && !hdmi_connector) {
+		drm_encoder_cleanup(encoder);
+		kfree(intel_dig_port);
 	}
 }