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 Index: wpa_supplicant-0.6.3/wpa_supplicant/scan.c
   4 ===================================================================
   5 --- wpa_supplicant-0.6.3.orig/wpa_supplicant/scan.c     2008-07-09 18:53:28.000000000 +0200
   6 +++ wpa_supplicant-0.6.3/wpa_supplicant/scan.c  2008-07-09 19:00:55.000000000 +0200
   7 @@ -48,11 +48,23 @@
   8         int enabled, scan_req = 0, ret;
   9         const u8 *extra_ie = NULL;
  10         size_t extra_ie_len = 0;
  11 +       int scan_ssid_all = 1;
  12
  13         if (wpa_s->disconnected && !wpa_s->scan_req)
  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 @@ -125,6 +137,10 @@
  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) {