ath9k: another fix for the A-MPDU buffer leak

The patch 'ath9k: fix a buffer leak in A-MPDU completion' addressed the
issue of running out of buffers/descriptors in the tx path if a STA is
deleted while tx status feedback is still pending.
The remaining issue is that the skbs of the buffers are not reclaimed,
leaving a memory leak.
This patch fixes this issue by running the buffers through
ath_tx_complete_buf(), ensuring that the pending frames counter is also
updated.

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

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index bd52ac111795..0644f1e91887 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -329,7 +329,6 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
         int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0;
         bool rc_update = true;
         struct ieee80211_tx_rate rates[4];
-        unsigned long flags;
 
         skb = bf->bf_mpdu;
         hdr = (struct ieee80211_hdr *)skb->data;
@@ -346,9 +345,21 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
         if (!sta) {
                 rcu_read_unlock();
 
-                spin_lock_irqsave(&sc->tx.txbuflock, flags);
-                list_splice_tail_init(bf_q, &sc->tx.txbuf);
-                spin_unlock_irqrestore(&sc->tx.txbuflock, flags);
+                INIT_LIST_HEAD(&bf_head);
+                while (bf) {
+                        bf_next = bf->bf_next;
+
+                        bf->bf_state.bf_type |= BUF_XRETRY;
+                        if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) ||
+                            !bf->bf_stale || bf_next != NULL)
+                                list_move_tail(&bf->list, &bf_head);
+
+                        ath_tx_rc_status(bf, ts, 0, 0, false);
+                        ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
+                                0, 0);
+
+                        bf = bf_next;
+                }
                 return;
         }