Support for handle CRC error which will automatically change a channel.

If Driver call data ind with zero length we can then handle that like CRC error which will change a FHHS channel if is pending.

Change-Id: Iba0cdce8dabf20f1640e63b33c116d7d3c0a9254

Author: Juha Heiskanen

source/MAC/IEEE802_15_4/mac_pd_sap.c

@@ -890,14 +890,19 @@ int8_t mac_pd_sap_data_cb(void *identifier, arm_phy_sap_msg_t *message)
 
     if (message->id == MAC15_4_PD_SAP_DATA_IND) {
         arm_pd_sap_generic_ind_t *pd_data_ind = &(message->message.generic_data_ind);
+        mac_pre_parsed_frame_t *buffer = NULL;
+        if (pd_data_ind->data_len == 0) {
+            goto ERROR_HANDLER;
+        }
+
         if (pd_data_ind->data_len < 3) {
             return -1;
         }
 
         mac_fcf_sequence_t fcf_read;
         const uint8_t *ptr = mac_header_parse_fcf_dsn(&fcf_read, pd_data_ind->data_ptr);
 
-        mac_pre_parsed_frame_t *buffer = mac_pd_sap_allocate_receive_buffer(rf_ptr, &fcf_read, pd_data_ind);
+        buffer = mac_pd_sap_allocate_receive_buffer(rf_ptr, &fcf_read, pd_data_ind);
         if (buffer && mac_filter_modify_link_quality(rf_ptr->mac_interface_id, buffer) == 1) {
             goto ERROR_HANDLER;
         }
@@ -935,7 +940,9 @@ int8_t mac_pd_sap_data_cb(void *identifier, arm_phy_sap_msg_t *message)
         }
 ERROR_HANDLER:
         mcps_sap_pre_parsed_frame_buffer_free(buffer);
-        sw_mac_stats_update(rf_ptr, STAT_MAC_RX_DROP, 0);
+        if (pd_data_ind->data_len >= 3) {
+            sw_mac_stats_update(rf_ptr, STAT_MAC_RX_DROP, 0);
+        }
         if (rf_ptr->fhss_api) {
             rf_ptr->fhss_api->data_tx_done(rf_ptr->fhss_api, false, false, 0);
         }