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 @@ -48,11 +48,23 @@ static void wpa_supplicant_scan(void *el
   6         int enabled, scan_req = 0, ret;
   7         const u8 *extra_ie = NULL;
   8         size_t extra_ie_len = 0;
   9 +       int scan_ssid_all = 1;
  10
  11         if (wpa_s->disconnected && !wpa_s->scan_req)
  12                 return;
  13
  14         enabled = 0;
  15 +
  16 +       /* check if all configured ssids should be scanned directly */
  17 +       ssid = wpa_s->conf->ssid;
  18 +       while (ssid) {
  19 +               if (!ssid->scan_ssid) {
  20 +                       scan_ssid_all = 0;
  21 +                       break;
  22 +               }
  23 +               ssid = ssid->next;
  24 +       }
  25 +
  26         ssid = wpa_s->conf->ssid;
  27         while (ssid) {
  28                 if (!ssid->disabled) {
  29 @@ -125,6 +137,10 @@ static void wpa_supplicant_scan(void *el
  30                 return;
  31         }
  32
  33 +       if (scan_ssid_all && !ssid) {
  34 +               ssid = wpa_s->conf->ssid;
  35 +       }
  36 +
  37         wpa_printf(MSG_DEBUG, "Starting AP scan (%s SSID)",
  38                    ssid ? "specific": "broadcast");
  39         if (ssid) {