package/kernel/mac80211/patches/subsys/374-mac80211-fix-time-is-after-bug-in-mlme.patch

   1 From: Ben Greear <greearb@candelatech.com>
   2 Date: Tue, 30 Mar 2021 16:07:49 -0700
   3 Subject: [PATCH] mac80211: fix time-is-after bug in mlme
   4
   5 The incorrect timeout check caused probing to happen when it did
   6 not need to happen.  This in turn caused tx performance drop
   7 for around 5 seconds in ath10k-ct driver.  Possibly that tx drop
   8 is due to a secondary issue, but fixing the probe to not happen
   9 when traffic is running fixes the symptom.
  10
  11 Signed-off-by: Ben Greear <greearb@candelatech.com>
  12 Fixes: 9abf4e49830d ("mac80211: optimize station connection monitor")
  13 Acked-by: Felix Fietkau <nbd@nbd.name>
  14 Link: https://lore.kernel.org/r/20210330230749.14097-1-greearb@candelatech.com
  15 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  16 ---
  17
  18 --- a/net/mac80211/mlme.c
  19 +++ b/net/mac80211/mlme.c
  20 @@ -4691,7 +4691,10 @@ static void ieee80211_sta_conn_mon_timer
  21                 timeout = sta->rx_stats.last_rx;
  22         timeout += IEEE80211_CONNECTION_IDLE_TIME;
  23
  24 -       if (time_is_before_jiffies(timeout)) {
  25 +       /* If timeout is after now, then update timer to fire at
  26 +        * the later date, but do not actually probe at this time.
  27 +        */
  28 +       if (time_is_after_jiffies(timeout)) {
  29                 mod_timer(&ifmgd->conn_mon_timer, round_jiffies_up(timeout));
  30                 return;
  31         }