package/network/services/hostapd/patches/800-dfs-enter-DFS-state-if-no-available-channel-is-found.patch

   1 From cefc52e6b93731c713f1bba1cb5e7e92105b758b Mon Sep 17 00:00:00 2001
   2 From: David Bauer <mail@david-bauer.net>
   3 Date: Fri, 3 Jul 2020 23:00:34 +0200
   4 Subject: [PATCH] dfs: enter DFS state if no available channel is found
   5
   6 Previously hostapd would not stop transmitting when a DFS event was
   7 detected and no available channel to switch to was available.
   8
   9 Disable and re-enable the interface to enter DFS state. This way, TX
  10 does not happen until the kernel notifies hostapd about the NOP
  11 expiring.
  12
  13 Signed-off-by: David Bauer <mail@david-bauer.net>
  14 ---
  15  src/ap/dfs.c | 11 +++++++++--
  16  1 file changed, 9 insertions(+), 2 deletions(-)
  17
  18 --- a/src/ap/dfs.c
  19 +++ b/src/ap/dfs.c
  20 @@ -1066,8 +1066,15 @@ static int hostapd_dfs_start_channel_swi
  21                                                   &oper_centr_freq_seg0_idx,
  22                                                   &oper_centr_freq_seg1_idx,
  23                                                   &skip_radar);
  24 -               if (!channel)
  25 -                       return err;
  26 +               if (!channel) {
  27 +                       /*
  28 +                        * Toggle interface state to enter DFS state
  29 +                        * until NOP is finished.
  30 +                        */
  31 +                       hostapd_disable_iface(iface);
  32 +                       hostapd_enable_iface(iface);
  33 +                       return 0;
  34 +               }
  35                 if (!skip_radar) {
  36                         iface->freq = channel->freq;
  37                         iface->conf->channel = channel->chan;