ath9k: Handle tx desc shortage more appropriately

Update tx BA window and complete the frame as failed
one if we can't clone the holding descriptor due to
unavailability of descriptors.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 24663ce10ef8..4ff155e8ee59 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -382,8 +382,24 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                                 struct ath_buf *tbf;
 
                                 tbf = ath_clone_txbuf(sc, bf_last);
-                                if (!tbf)
+                                /*
+                                 * Update tx baw and complete the frame with
+                                 * failed status if we run out of tx buf
+                                 */
+                                if (!tbf) {
+                                        spin_lock_bh(&txq->axq_lock);
+                                        ath_tx_update_baw(sc, tid,
+                                                          bf->bf_seqno);
+                                        spin_unlock_bh(&txq->axq_lock);
+
+                                        bf->bf_state.bf_type |= BUF_XRETRY;
+                                        ath_tx_rc_status(bf, ds, nbad,
+                                                         0, false);
+                                        ath_tx_complete_buf(sc, bf, &bf_head,
+                                                            0, 0);
                                         break;
+                                }
+
                                 ath9k_hw_cleartxdesc(sc->sc_ah, tbf->bf_desc);
                                 list_add_tail(&tbf->list, &bf_head);
                         } else {