qcacmn: Disable simultaneous scan based on ini

Currently the driver allows simultaneous scan irrespective
of the dual mac feature ini config, which can cause
connect latency.

Fix is to disable the simultaneous scan if the dual
mac config ini is configured to disable DBS scan.

Change-Id: I332284880c04955a8ae2ff19eae10313f240d9ae
CRs-Fixed: 2385027

os_if/linux/scan/src/wlan_cfg80211_scan.c

@@ -1255,6 +1255,20 @@ static inline void wlan_cfg80211_update_scan_policy_type_flags(
 }
 #endif
 
+#ifdef WLAN_POLICY_MGR_ENABLE
+static bool
+wlan_cfg80211_allow_simultaneous_scan(struct wlan_objmgr_psoc *psoc)
+{
+	return policy_mgr_is_scan_simultaneous_capable(psoc);
+}
+#else
+static bool
+wlan_cfg80211_allow_simultaneous_scan(struct wlan_objmgr_psoc *psoc)
+{
+	return true;
+}
+#endif
+
 int wlan_cfg80211_scan(struct wlan_objmgr_vdev *vdev,
 		       struct cfg80211_scan_request *request,
 		       struct scan_params *params)
@@ -1280,6 +1294,24 @@ int wlan_cfg80211_scan(struct wlan_objmgr_vdev *vdev,
 		cfg80211_err("Invalid psoc object");
 		return -EINVAL;
 	}
+
+	/* Get NL global context from objmgr*/
+	osif_priv = wlan_pdev_get_ospriv(pdev);
+	if (!osif_priv) {
+		cfg80211_err("Invalid osif priv object");
+		return -EINVAL;
+	}
+
+	/*
+	 * If a scan is already going on i.e the qdf_list ( scan que) is not
+	 * empty, and the simultaneous scan is disabled, dont allow 2nd scan
+	 */
+	if (!wlan_cfg80211_allow_simultaneous_scan(psoc) &&
+	    !qdf_list_empty(&osif_priv->osif_scan->scan_req_q)) {
+		cfg80211_err("Simultaneous scan disabled, reject scan");
+		return -EINVAL;
+	}
+
 	req = qdf_mem_malloc(sizeof(*req));
 	if (!req) {
 		cfg80211_err("Failed to allocate scan request memory");
@@ -1288,8 +1320,6 @@ int wlan_cfg80211_scan(struct wlan_objmgr_vdev *vdev,
 	/* Initialize the scan global params */
 	ucfg_scan_init_default_params(vdev, req);
 
-	/* Get NL global context from objmgr*/
-	osif_priv = wlan_pdev_get_ospriv(pdev);
 	req_id = osif_priv->osif_scan->req_id;
 	scan_id = ucfg_scan_get_scan_id(psoc);
 	if (!scan_id) {
@@ -1297,6 +1327,7 @@ int wlan_cfg80211_scan(struct wlan_objmgr_vdev *vdev,
 		qdf_mem_free(req);
 		return -EINVAL;
 	}
+
 	/* fill the scan request structure */
 	req->vdev = vdev;
 	req->scan_req.vdev_id = wlan_vdev_get_id(vdev);