sched scan: Fix passive scanning

Scan wasn't initiated in case the config contained only networks without
scan_ssid. In such a case we want scan to be initiated without any SSIDs
to actively scan but include all the SSIDs in the filter list. Also
added some debug logs to easily see which SSIDs were included in which
list.

Cc: Luciano Coelho <coelho@ti.com>
Signed-off-by: Eyal Shapira <eyal@wizery.com>

wpa_supplicant/scan.c

@@ -710,8 +710,10 @@ int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 	else
 		max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 
-	if (wpa_s->sched_scanning)
+	if (wpa_s->sched_scanning) {
+		wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 		return 0;
+	}
 
 	os_memset(&params, 0, sizeof(params));
 
@@ -754,6 +756,8 @@ int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 		}
 
 		if (params.filter_ssids && ssid->ssid && ssid->ssid_len) {
+			wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
+				wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 			os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
 				  ssid->ssid, ssid->ssid_len);
 			params.filter_ssids[params.num_filter_ssids].ssid_len =
@@ -762,6 +766,8 @@ int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 		}
 
 		if (ssid->scan_ssid) {
+			wpa_dbg(wpa_s, MSG_DEBUG, "add to active scan ssid: %s",
+				wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 			params.ssids[params.num_ssids].ssid =
 				ssid->ssid;
 			params.ssids[params.num_ssids].ssid_len =
@@ -779,11 +785,6 @@ int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 		ssid = ssid->next;
 	}
 
-	if (!params.num_ssids) {
-		os_free(params.filter_ssids);
-		return 0;
-	}
-
 	if (wpa_s->wps)
 		wps_ie = wpa_supplicant_extra_ies(wpa_s, &params);