package/mac80211/patches/520-ath9k_ack_timeout_workaround.patch

   1 --- a/drivers/net/wireless/ath/ath9k/hw.c
   2 +++ b/drivers/net/wireless/ath/ath9k/hw.c
   3 @@ -1233,6 +1233,17 @@ void ath9k_hw_init_global_settings(struc
   4         /* As defined by IEEE 802.11-2007 17.3.8.6 */
   5         slottime = ah->slottime + 3 * ah->coverage_class;
   6         acktimeout = slottime + sifstime;
   7 +
   8 +       /*
   9 +        * Workaround for early ACK timeouts, add an offset to match the
  10 +        * initval's 64us ack timeout value.
  11 +        * This was initially only meant to work around an issue with delayed
  12 +        * BA frames in some implementations, but it has been found to fix ACK
  13 +        * timeout issues in other cases as well.
  14 +        */
  15 +       if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ)
  16 +               acktimeout += 64 - sifstime - ah->slottime;
  17 +
  18         ath9k_hw_setslottime(ah, slottime);
  19         ath9k_hw_set_ack_timeout(ah, acktimeout);
  20         ath9k_hw_set_cts_timeout(ah, acktimeout);