qcacmn: Add support for scan and MLME synchronization

Reject scan request, if any VDEV is in START/DFS_CAC/SUSPEND states.

Change-Id: I1047ba510df5ae5debd1e3d5c8a064a57af65fbf
CRs-Fixed: 2384163

umac/cmn_services/utils/inc/wlan_utility.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -285,4 +285,17 @@ void
 wlan_util_stats_get_rssi(bool db2dbm_enabled, int32_t bcn_snr, int32_t dat_snr,
 			 int8_t *rssi);
 
+/**
+ * wlan_util_is_pdev_scan_allowed() - Check for vdev is allowed to scan
+ * @pdev: pdev pointer
+ * @dbg_id: module id
+ *
+ * Iterates through all vdevs, checks if any VDEV is not either in S_INIT or in
+ * S_UP state
+ *
+ * Return: QDF_STATUS_SUCCESS,if scan is allowed, otherwise QDF_STATUS_E_FAILURE
+ */
+QDF_STATUS wlan_util_is_pdev_scan_allowed(struct wlan_objmgr_pdev *pdev,
+					  wlan_objmgr_ref_dbgid dbg_id);
+
 #endif /* _WLAN_UTILITY_H_ */

umac/cmn_services/utils/src/wlan_utility.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -462,6 +462,43 @@ QDF_STATUS wlan_util_pdev_vdevs_deschan_match(struct wlan_objmgr_pdev *pdev,
 
 	return QDF_STATUS_E_FAILURE;
 }
+
+static void wlan_vdev_scan_allowed(struct wlan_objmgr_pdev *pdev, void *object,
+				   void *arg)
+{
+	struct wlan_objmgr_vdev *vdev = (struct wlan_objmgr_vdev *)object;
+	uint8_t *flag = (uint8_t *)arg;
+
+	wlan_vdev_obj_lock(vdev);
+	if (wlan_vdev_mlme_is_scan_allowed(vdev) != QDF_STATUS_SUCCESS)
+		*flag = 1;
+
+	wlan_vdev_obj_unlock(vdev);
+}
+
+QDF_STATUS wlan_util_is_pdev_scan_allowed(struct wlan_objmgr_pdev *pdev,
+					  wlan_objmgr_ref_dbgid dbg_id)
+{
+	uint8_t flag = 0;
+
+	if (!pdev)
+		return QDF_STATUS_E_INVAL;
+
+	wlan_objmgr_pdev_iterate_obj_list(pdev, WLAN_VDEV_OP,
+					  wlan_vdev_scan_allowed,
+					  &flag, 0, dbg_id);
+
+	if (flag == 1)
+		return QDF_STATUS_E_FAILURE;
+
+	return QDF_STATUS_SUCCESS;
+}
+#else
+QDF_STATUS wlan_util_is_pdev_scan_allowed(struct wlan_objmgr_pdev *pdev,
+					  wlan_objmgr_ref_dbgid dbg_id)
+{
+	return QDF_STATUS_SUCCESS;
+}
 #endif
 
 void