[PATCH 5.10 39/43] mac80211: check if atf has been disabled in __ieee80211_schedule_txq

[Greg Kroah-Hartman]

From: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>

commit c13cf5c159660451c8fbdc37efb998b198e1d305 upstream.

Check if atf has been disabled in __ieee80211_schedule_txq() in order to
avoid a given sta is always put to the beginning of the active_txqs list
and never moved to the end since deficit is not decremented in
ieee80211_sta_register_airtime()

Fixes: b4809e9484da1 ("mac80211: Add airtime accounting and scheduling to TXQs")
Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
Acked-by: Toke Høiland-Jørgensen <toke@xxxxxxx>
Link: https://lore.kernel.org/r/93889406c50f1416214c079ca0b8c9faecc5143e.1608975195.git.lorenzo@xxxxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/mac80211/tx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3836,7 +3836,7 @@ void __ieee80211_schedule_txq(struct iee
 		 * get immediately moved to the back of the list on the next
 		 * call to ieee80211_next_txq().
 		 */
-		if (txqi->txq.sta &&
+		if (txqi->txq.sta && local->airtime_flags &&
 		    wiphy_ext_feature_isset(local->hw.wiphy,
 					    NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
 			list_add(&txqi->schedule_order,