package/kernel/mac80211/patches/302-ath-DFS-limit-number-of-potential-PRI-sequences.patch

   1 From: Zefir Kurtisi <zefir.kurtisi@neratec.com>
   2 Date: Tue, 16 Jun 2015 10:34:03 +0200
   3 Subject: [PATCH] ath: DFS - limit number of potential PRI sequences
   4
   5 In the PRI detector, after the current radar pulse
   6 has been checked agains existing PRI sequences, it
   7 is considered as part of a new potential sequence.
   8
   9 Previously, the condition to accept a new sequence
  10 was to have at least the same number of pulses as
  11 the longest matching sequence. This was wrong,
  12 since it led to duplicates of PRI sequences.
  13
  14 This patch changes the acceptance criteria for new
  15 potential sequences from 'at least' to 'more than'
  16 the longest existing.
  17
  18 Detection performance remains unaffected, while
  19 the number of PRI sequences accounted at runtime
  20 (and with it CPU load) is reduced by up to 50%.
  21
  22 Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
  23 ---
  24
  25 --- a/drivers/net/wireless/ath/dfs_pri_detector.c
  26 +++ b/drivers/net/wireless/ath/dfs_pri_detector.c
  27 @@ -273,7 +273,7 @@ static bool pseq_handler_create_sequence
  28                                 tmp_false_count++;
  29                         }
  30                 }
  31 -               if (ps.count < min_count)
  32 +               if (ps.count <= min_count)
  33                         /* did not reach minimum count, drop sequence */
  34                         continue;
  35