qcacld-3.0: Return valid channel if ACS scan fails

Return valid channel whenever ACS scan returns no results

Change-Id: I44d9248550a263d12ac9f060eb50ac4bfa4d1d11
CRs-Fixed: 2454070

core/sap/src/sap_api_link_cntl.c

@@ -223,18 +223,6 @@ wlansap_calculate_chan_from_scan_result(mac_handle_t mac_handle,
 	if (list)
 		QDF_TRACE(QDF_MODULE_ID_SAP, QDF_TRACE_LEVEL_DEBUG,
 			  FL("num_entries %d"), qdf_list_size(list));
-	if (!list || (list && !qdf_list_size(list))) {
-		sme_err("get scan result failed");
-		QDF_TRACE(QDF_MODULE_ID_SAP, QDF_TRACE_LEVEL_ERROR,
-			  FL("Failed to get scan results"));
-		if (list)
-			ucfg_scan_purge_results(list);
-		/*
-		 * No scan results So, set the operation channel not selected
-		 * to allow the default channel to be set when reporting to HDD
-		 */
-		return oper_channel;
-	}
 
 	wlansap_send_acs_success_event(sap_ctx, scan_id);
 

core/sap/src/sap_ch_select.c

@@ -339,7 +339,8 @@ static void sap_process_avoid_ie(mac_handle_t mac_handle,
 	mac_ctx = MAC_CONTEXT(mac_handle);
 	spect_ch = spect_info->pSpectCh;
 
-	qdf_list_peek_front(scan_list, &cur_lst);
+	if (scan_list)
+		qdf_list_peek_front(scan_list, &cur_lst);
 	while (cur_lst) {
 		cur_node = qdf_container_of(cur_lst, struct scan_cache_node,
 					    node);
@@ -1553,7 +1554,8 @@ static void sap_compute_spect_weight(tSapChSelSpectInfo *pSpectInfoParams,
 	 */
 	SET_ACS_BAND(operatingBand, sap_ctx);
 
-	qdf_list_peek_front(scan_list, &cur_lst);
+	if (scan_list)
+		qdf_list_peek_front(scan_list, &cur_lst);
 	while (cur_lst) {
 		uint32_t ie_len = 0;
 		uint8_t *ie_ptr;
@@ -2649,7 +2651,7 @@ uint8_t sap_select_channel(mac_handle_t mac_handle,
 	 * If ACS weight is not enabled on noise_floor/channel_free/tx_power,
 	 * then skip acs process if no bss found.
 	 */
-	if (!scan_list &&
+	if ((!scan_list || !qdf_list_size(scan_list)) &&
 	    !(sap_ctx->auto_channel_select_weight & 0xffff00)) {
 		QDF_TRACE(QDF_MODULE_ID_SAP, QDF_TRACE_LEVEL_INFO_HIGH,
 			  FL("No external AP present"));