qcacld-3.0: cleanup scan before start driver mode change

When driver mode changes from mission mode to FTM mode,
__hdd_driver_mode_change will take driver dsc lock.
wlan0 interface NETDEV_GOING_DOWN will not be handled by
driver.
If wlan0 scan is in progress, __hdd_driver_mode_change will flush
the scan queue but scan done is not indicated to kernel if
wlan0 interface is down.
That will cause the new scan request failed by kernel because
the old is not cleared.

Fix by cleanup the scan queue and indicate scan done to kernel
before __hdd_driver_mode_change take the driver dsc lock.

Change-Id: Ifd0fb82f0f8dd6cd873f5666ef95c7f44b157c78
CRs-Fixed: 3675103

core/hdd/src/wlan_hdd_main.c

@@ -1051,8 +1051,11 @@ static int hdd_netdev_notifier_call(struct notifier_block *nb,
 	}
 
 	errno = osif_vdev_sync_op_start(net_dev, &vdev_sync);
-	if (errno)
+	if (errno) {
+		hdd_debug("%s New Net Device State = %lu, flags 0x%x NOTIFY_DONE",
+			  net_dev->name, state, net_dev->flags);
 		return NOTIFY_DONE;
+	}
 
 	errno = __hdd_netdev_notifier_call(net_dev, state);
 
@@ -20006,6 +20009,35 @@ static int __hdd_driver_mode_change(struct hdd_context *hdd_ctx,
 	return 0;
 }
 
+static void hdd_pre_mode_change(enum QDF_GLOBAL_MODE mode)
+{
+	struct osif_psoc_sync *psoc_sync;
+	struct hdd_context *hdd_ctx;
+	int errno;
+	enum QDF_GLOBAL_MODE curr_mode;
+
+	curr_mode = hdd_get_conparam();
+	if (curr_mode != QDF_GLOBAL_MISSION_MODE)
+		return;
+
+	hdd_ctx = cds_get_context(QDF_MODULE_ID_HDD);
+	errno = wlan_hdd_validate_context(hdd_ctx);
+	if (errno)
+		return;
+
+	errno = osif_psoc_sync_op_start(hdd_ctx->parent_dev, &psoc_sync);
+	if (errno) {
+		hdd_err("psoc op start failed");
+		return;
+	}
+
+	hdd_debug("cleanup scan queue");
+	if (hdd_ctx && hdd_ctx->pdev)
+		wlan_cfg80211_cleanup_scan_queue(hdd_ctx->pdev, NULL);
+
+	osif_psoc_sync_op_stop(psoc_sync);
+}
+
 static int hdd_driver_mode_change(enum QDF_GLOBAL_MODE mode)
 {
 	struct osif_driver_sync *driver_sync;
@@ -20015,6 +20047,8 @@ static int hdd_driver_mode_change(enum QDF_GLOBAL_MODE mode)
 
 	hdd_enter();
 
+	hdd_pre_mode_change(mode);
+
 	status = osif_driver_sync_trans_start_wait(&driver_sync);
 	if (QDF_IS_STATUS_ERROR(status)) {
 		hdd_err("Failed to start 'mode change'; status:%u", status);