When a client does not generate any local tx activity, accumulating airtime deficit for the round-robin scheduler can be harmful. If this goes on for too long, the deficit could grow quite large, which might cause unreasonable initial latency once the client becomes active Signed-off-by: Felix Fietkau <nbd@xxxxxxxx> --- net/mac80211/sta_info.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index 28ab55a072c6..c9852f71e8e1 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -2046,6 +2046,7 @@ void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid, struct ieee80211_local *local = sta->sdata->local; u8 ac = ieee80211_ac_from_tid(tid); u32 airtime = 0; + u32 diff; if (sta->local->airtime_flags & AIRTIME_USE_TX) airtime += tx_airtime; @@ -2055,7 +2056,11 @@ void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid, spin_lock_bh(&local->active_txq_lock[ac]); sta->airtime[ac].tx_airtime += tx_airtime; sta->airtime[ac].rx_airtime += rx_airtime; - sta->airtime[ac].deficit -= airtime; + + diff = (u32)jiffies - sta->airtime[ac].last_active; + if (diff <= AIRTIME_ACTIVE_DURATION) + sta->airtime[ac].deficit -= airtime; + spin_unlock_bh(&local->active_txq_lock[ac]); } EXPORT_SYMBOL(ieee80211_sta_register_airtime); -- 2.36.1
