qcacld-3.0: Fix ACS invalid defalut channel selected

If the ACS SCAN failed, the API sap_select_default_oper_chan
will select a default channel from ACS scan channel list.
At present sap_select_default_oper_chan doesn't validate the
channel with regulatory. It may select an invalid channel and
report to hostapd. This will happen when driver is doing ACS
scan, the upper layer set different country code and result to
some channels in the acs freq_list become invalid.
Fix by checking the channel supported by regulatory before select
it.

Change-Id: I438b2947ba1fd5388a2472d5122e55edc89229db
CRs-Fixed: 2723689

core/sap/src/sap_fsm.c

@@ -670,6 +670,7 @@ uint32_t sap_select_default_oper_chan(struct mac_context *mac_ctx,
 				      struct sap_acs_cfg *acs_cfg)
 {
 	uint16_t i;
+	uint32_t freq0 = 0, freq1 = 0, freq2 = 0, default_freq;
 
 	if (!acs_cfg)
 		return 0;
@@ -692,19 +693,36 @@ uint32_t sap_select_default_oper_chan(struct mac_context *mac_ctx,
 	 * rare in 2.4ghz band, so 5ghz should be preferred. If we get a 5Ghz
 	 * chan in the acs cfg ch list , we should go for that first else the
 	 * default channel can be 2.4ghz.
+	 * Add check regulatory channel state before select the channel.
 	 */
 
 	for (i = 0; i < acs_cfg->ch_list_count; i++) {
-		if (WLAN_REG_IS_5GHZ_CH_FREQ(acs_cfg->freq_list[i])) {
-			sap_debug("default freq chosen as %d",
-				  acs_cfg->freq_list[i]);
-			return acs_cfg->freq_list[i];
+		enum channel_state state =
+			wlan_reg_get_channel_state_for_freq(
+					mac_ctx->pdev, acs_cfg->freq_list[i]);
+		if (!freq0 && state == CHANNEL_STATE_ENABLE &&
+		    WLAN_REG_IS_5GHZ_CH_FREQ(acs_cfg->freq_list[i])) {
+			freq0 = acs_cfg->freq_list[i];
+			break;
+		} else if (!freq1 && state == CHANNEL_STATE_DFS &&
+			   WLAN_REG_IS_5GHZ_CH_FREQ(acs_cfg->freq_list[i])) {
+			freq1 = acs_cfg->freq_list[i];
+		} else if (!freq2 && state == CHANNEL_STATE_ENABLE) {
+			freq2 = acs_cfg->freq_list[i];
 		}
 	}
+	default_freq = freq0;
+	if (!default_freq)
+		default_freq = freq1;
+	if (!default_freq)
+		default_freq = freq2;
+	if (!default_freq)
+		default_freq = acs_cfg->freq_list[0];
 
-	sap_debug("default frequency chosen as %d", acs_cfg->freq_list[0]);
+	sap_debug("default freq %d chosen from %d %d %d %d", default_freq,
+		  freq0, freq1, freq2, acs_cfg->freq_list[0]);
 
-	return acs_cfg->freq_list[0];
+	return default_freq;
 }
 
 QDF_STATUS