package/wpa_supplicant/patches/120-ssid_scan.patch

   1 Don't do broadcast SSID scans, if all configured SSIDs use scan_ssid=1. Improves background scanning in supplicant-managed roaming.
   2
   3 --- a/wpa_supplicant/scan.c
   4 +++ b/wpa_supplicant/scan.c
   5 @@ -73,6 +73,7 @@ static void wpa_supplicant_scan(void *el
   6         struct wpabuf *wps_ie = NULL;
   7         const u8 *extra_ie = NULL;
   8         size_t extra_ie_len = 0;
   9 +       int scan_ssid_all = 1;
  10         int wps = 0;
  11  #ifdef CONFIG_WPS
  12         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
  13 @@ -82,6 +83,17 @@ static void wpa_supplicant_scan(void *el
  14                 return;
  15
  16         enabled = 0;
  17 +
  18 +       /* check if all configured ssids should be scanned directly */
  19 +       ssid = wpa_s->conf->ssid;
  20 +       while (ssid) {
  21 +               if (!ssid->scan_ssid) {
  22 +                       scan_ssid_all = 0;
  23 +                       break;
  24 +               }
  25 +               ssid = ssid->next;
  26 +       }
  27 +
  28         ssid = wpa_s->conf->ssid;
  29         while (ssid) {
  30                 if (!ssid->disabled) {
  31 @@ -154,6 +166,10 @@ static void wpa_supplicant_scan(void *el
  32                 return;
  33         }
  34
  35 +       if (scan_ssid_all && !ssid) {
  36 +               ssid = wpa_s->conf->ssid;
  37 +       }
  38 +
  39         wpa_printf(MSG_DEBUG, "Starting AP scan (%s SSID)",
  40                    ssid ? "specific": "broadcast");
  41         if (ssid) {