qcacmn: Fix mem leaks in nan msg posting to scheduler

Fix possible mem leaks in NAN module when msg posting to scheduler
fails. Also setup schduler flush callback for NAN module to purge
messages during driver unload.

Change-Id: I8d034d9bc9a58af95f2c4330a6fc7423885bdae6
CRs-fixed: 2341213

umac/nan/dispatcher/src/nan_ucfg_api.c

@@ -302,6 +302,38 @@ inline QDF_STATUS ucfg_nan_get_callbacks(struct wlan_objmgr_psoc *psoc,
 	return QDF_STATUS_SUCCESS;
 }
 
+static QDF_STATUS ucfg_nan_sch_msg_flush_cb(struct scheduler_msg *msg)
+{
+	struct wlan_objmgr_vdev *vdev = NULL;
+
+	if (!msg || !msg->bodyptr)
+		return QDF_STATUS_E_NULL_VALUE;
+
+	switch (msg->type) {
+	case NDP_INITIATOR_REQ:
+		vdev = ((struct nan_datapath_initiator_req *)
+			msg->bodyptr)->vdev;
+		break;
+	case NDP_RESPONDER_REQ:
+		vdev = ((struct nan_datapath_responder_req *)
+			msg->bodyptr)->vdev;
+		break;
+	case NDP_END_REQ:
+		vdev = ((struct nan_datapath_end_req *)msg->bodyptr)->vdev;
+		break;
+	default:
+		nan_err("Invalid NAN msg type during sch flush");
+		return QDF_STATUS_E_INVAL;
+	}
+
+	if (vdev) {
+		wlan_objmgr_vdev_release_ref(vdev, WLAN_NAN_ID);
+		qdf_mem_free(msg->bodyptr);
+	}
+
+	return QDF_STATUS_SUCCESS;
+}
+
 QDF_STATUS ucfg_nan_req_processor(struct wlan_objmgr_vdev *vdev,
 				  void *in_req, uint32_t req_type)
 {
@@ -337,12 +369,14 @@ QDF_STATUS ucfg_nan_req_processor(struct wlan_objmgr_vdev *vdev,
 	qdf_mem_copy(msg.bodyptr, in_req, len);
 	msg.type = req_type;
 	msg.callback = nan_scheduled_msg_handler;
+	msg.flush_callback = ucfg_nan_sch_msg_flush_cb;
 	status = scheduler_post_message(QDF_MODULE_ID_HDD,
 					QDF_MODULE_ID_NAN,
 					QDF_MODULE_ID_OS_IF, &msg);
 	if (QDF_IS_STATUS_ERROR(status)) {
 		nan_err("failed to post msg to NAN component, status: %d",
 			status);
+		qdf_mem_free(msg.bodyptr);
 	}
 
 	return status;