ath9k: avoid sending a-mpdu packets to sleeping stations

If the driver gets a tx status report for an A-MPDU sent to a station that
just went to sleep, that leaves a race condition where this tx status can
trigger another A-MPDU transmission.
To fix this, check if the station is sleeping before queueing the tid.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index e815e82..e1d1e90 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -551,7 +551,8 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                if (clear_filter)
                        tid->ac->clear_ps_filter = true;
                list_splice(&bf_pending, &tid->buf_q);
-               ath_tx_queue_tid(txq, tid);
+               if (!an->sleeping)
+                       ath_tx_queue_tid(txq, tid);
                spin_unlock_bh(&txq->axq_lock);
        }
 
@@ -1413,7 +1414,8 @@ static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
                 */
                TX_STAT_INC(txctl->txq->axq_qnum, a_queued_sw);
                list_add_tail(&bf->list, &tid->buf_q);
-               ath_tx_queue_tid(txctl->txq, tid);
+               if (!txctl->an || !txctl->an->sleeping)
+                       ath_tx_queue_tid(txctl->txq, tid);
                return;
        }