qcacld-3.0: Stop SAP if all channels are disabled

User disables all the channels when the SAP is in
operation, and policy manager restart sap functionality
cannot get any valid channels and SAP also doesn't stop.
Later, kernel stops the SAP, since it is operating on an
invalid channel.

To fix this, restart the SAP on a valid channel only if
atleast one valid channel is available. Otherwise, stop
the SAP instead of waiting for kernel to stop the SAP.

CRs-Fixed: 3617706
Change-Id: Ia613b8e9585ff19aae9bf97ea5d0fc230ae41c5f

core/hdd/src/wlan_hdd_ioctl.c

@@ -6560,12 +6560,21 @@ static void disconnect_sta_and_restart_sap(struct hdd_context *hdd_ctx,
 	struct hdd_adapter *adapter, *next = NULL;
 	QDF_STATUS status;
 	struct hdd_ap_ctx *ap_ctx;
+	uint32_t ch_list[NUM_CHANNELS];
+	uint32_t ch_count = 0;
+	bool is_valid_chan_present = true;
 
 	if (!hdd_ctx)
 		return;
 
 	hdd_check_and_disconnect_sta_on_invalid_channel(hdd_ctx, reason);
 
+	status = policy_mgr_get_valid_chans(hdd_ctx->psoc, ch_list, &ch_count);
+	if (QDF_IS_STATUS_ERROR(status) || !ch_count) {
+		hdd_debug("No valid channels present, stop the SAPs");
+		is_valid_chan_present = false;
+	}
+
 	status = hdd_get_front_adapter(hdd_ctx, &adapter);
 	while (adapter && (status == QDF_STATUS_SUCCESS)) {
 		if (hdd_validate_adapter(adapter) ||
@@ -6574,7 +6583,10 @@ static void disconnect_sta_and_restart_sap(struct hdd_context *hdd_ctx,
 		}
 
 		ap_ctx = WLAN_HDD_GET_AP_CTX_PTR(adapter->deflink);
-		if (check_disable_channels(hdd_ctx, ap_ctx->operating_chan_freq))
+		if (!is_valid_chan_present)
+			wlan_hdd_stop_sap(adapter);
+		else if (check_disable_channels(hdd_ctx,
+						ap_ctx->operating_chan_freq))
 			policy_mgr_check_sap_restart(hdd_ctx->psoc,
 						     adapter->deflink->vdev_id);
 next_adapter: