Use sched_scan in driver init

This patch uses sched_scan, if available, when the driver is
initialized. It also adds a couple of cancel operations where
appropriate.

Signed-off-by: Luciano Coelho <coelho@ti.com>

wpa_supplicant/events.c

@@ -996,10 +996,14 @@ static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
 				 */
 				timeout_sec = 0;
 				timeout_usec = 250000;
+				wpa_supplicant_req_new_scan(wpa_s, timeout_sec,
+							    timeout_usec);
+				return 0;
 			}
 #endif /* CONFIG_P2P */
-			wpa_supplicant_req_new_scan(wpa_s, timeout_sec,
-						    timeout_usec);
+			if (wpa_supplicant_req_sched_scan(wpa_s))
+				wpa_supplicant_req_new_scan(wpa_s, timeout_sec,
+							    timeout_usec);
 		}
 	}
 	return 0;

wpa_supplicant/sme.c

@@ -237,6 +237,7 @@ void sme_authenticate(struct wpa_supplicant *wpa_s,
 	}
 #endif /* CONFIG_P2P */
 
+	wpa_supplicant_cancel_sched_scan(wpa_s);
 	wpa_supplicant_cancel_scan(wpa_s);
 
 	wpa_msg(wpa_s, MSG_INFO, "SME: Trying to authenticate with " MACSTR

wpa_supplicant/wpa_supplicant.c

@@ -446,6 +446,8 @@ static void wpa_supplicant_cleanup(struct wpa_supplicant *wpa_s)
 	offchannel_deinit(wpa_s);
 #endif /* CONFIG_OFFCHANNEL */
 
+	wpa_supplicant_cancel_sched_scan(wpa_s);
+
 	os_free(wpa_s->next_scan_freqs);
 	wpa_s->next_scan_freqs = NULL;
 
@@ -1176,6 +1178,7 @@ void wpa_supplicant_associate(struct wpa_supplicant *wpa_s,
 			wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 		os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 	}
+	wpa_supplicant_cancel_sched_scan(wpa_s);
 	wpa_supplicant_cancel_scan(wpa_s);
 
 	/* Starting new association, so clear the possibly used WPA IE from the
@@ -2087,7 +2090,9 @@ int wpa_supplicant_driver_init(struct wpa_supplicant *wpa_s)
 
 	wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 	if (wpa_supplicant_enabled_networks(wpa_s->conf)) {
-		wpa_supplicant_req_scan(wpa_s, interface_count, 100000);
+		if (wpa_supplicant_req_sched_scan(wpa_s))
+			wpa_supplicant_req_scan(wpa_s, interface_count,
+						100000);
 		interface_count++;
 	} else
 		wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);