ath9k: fix yet another buffer leak in the tx aggregation code

When an aggregation session is being cleaned up, while the tx status
for some frames is being processed, the TID is flushed and its buffers
are sent out.

Unfortunately that left the pending un-acked frames unprocessed, thus
leaking buffers. Fix this by reordering the code so that those frames
are processed first, before the TID is flushed.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Cc: stable@kernel.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 21aa5bdb2592e6216aeeeb0da5159133e7618153..501b72821b4d426e5138b7f3b84e9a962d617361 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -518,6 +518,14 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                bf = bf_next;
        }
 
+       /* prepend un-acked frames to the beginning of the pending frame queue */
+       if (!list_empty(&bf_pending)) {
+               spin_lock_bh(&txq->axq_lock);
+               list_splice(&bf_pending, &tid->buf_q);
+               ath_tx_queue_tid(txq, tid);
+               spin_unlock_bh(&txq->axq_lock);
+       }
+
        if (tid->state & AGGR_CLEANUP) {
                if (tid->baw_head == tid->baw_tail) {
                        tid->state &= ~AGGR_ADDBA_COMPLETE;
@@ -530,14 +538,6 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                return;
        }
 
-       /* prepend un-acked frames to the beginning of the pending frame queue */
-       if (!list_empty(&bf_pending)) {
-               spin_lock_bh(&txq->axq_lock);
-               list_splice(&bf_pending, &tid->buf_q);
-               ath_tx_queue_tid(txq, tid);
-               spin_unlock_bh(&txq->axq_lock);
-       }
-
        rcu_read_unlock();
 
        if (needreset)