ath9k: fix the .flush driver op implementation

This patch simplifies the flush op and reuses ath_drain_all_txq for
flushing out pending frames if necessary. It also uses a global timeout
of 200ms instead of the per-queue 60ms timeout.

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/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index c718ab5..099bd41 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -189,7 +189,6 @@ struct ath_txq {
        u32 axq_ampdu_depth;
        bool stopped;
        bool axq_tx_inprogress;
-       bool txq_flush_inprogress;
        struct list_head axq_acq;
        struct list_head txq_fifo[ATH_TXFIFO_DEPTH];
        struct list_head txq_fifo_pending;

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 2e228aa..115f162 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -2128,56 +2128,42 @@ static void ath9k_set_coverage_class(struct ieee80211_hw *hw, u8 coverage_class)
 
 static void ath9k_flush(struct ieee80211_hw *hw, bool drop)
 {
-#define ATH_FLUSH_TIMEOUT      60 /* ms */
        struct ath_softc *sc = hw->priv;
-       struct ath_txq *txq = NULL;
-       struct ath_hw *ah = sc->sc_ah;
-       struct ath_common *common = ath9k_hw_common(ah);
-       int i, j, npend = 0;
+       int timeout = 200; /* ms */
+       int i, j;
 
+       ath9k_ps_wakeup(sc);
        mutex_lock(&sc->mutex);
 
        cancel_delayed_work_sync(&sc->tx_complete_work);
 
-       for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
-               if (!ATH_TXQ_SETUP(sc, i))
-                       continue;
-               txq = &sc->tx.txq[i];
+       if (drop)
+               timeout = 1;
 
-               if (!drop) {
-                       for (j = 0; j < ATH_FLUSH_TIMEOUT; j++) {
-                               if (!ath9k_has_pending_frames(sc, txq))
-                                       break;
-                               usleep_range(1000, 2000);
-                       }
-               }
+       for (j = 0; j < timeout; j++) {
+               int npend = 0;
+
+               if (j)
+                       usleep_range(1000, 2000);
 
-               if (drop || ath9k_has_pending_frames(sc, txq)) {
-                       ath_dbg(common, ATH_DBG_QUEUE, "Drop frames from hw queue:%d\n",
-                               txq->axq_qnum);
-                       spin_lock_bh(&txq->axq_lock);
-                       txq->txq_flush_inprogress = true;
-                       spin_unlock_bh(&txq->axq_lock);
-
-                       ath9k_ps_wakeup(sc);
-                       ath9k_hw_stoptxdma(ah, txq->axq_qnum);
-                       npend = ath9k_hw_numtxpending(ah, txq->axq_qnum);
-                       ath9k_ps_restore(sc);
-                       if (npend)
-                               break;
-
-                       ath_draintxq(sc, txq, false);
-                       txq->txq_flush_inprogress = false;
+               for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+                       if (!ATH_TXQ_SETUP(sc, i))
+                               continue;
+
+                       npend += ath9k_has_pending_frames(sc, &sc->tx.txq[i]);
                }
+
+               if (!npend)
+                   goto out;
        }
 
-       if (npend) {
+       if (!ath_drain_all_txq(sc, false))
                ath_reset(sc, false);
-               txq->txq_flush_inprogress = false;
-       }
 
+out:
        ieee80211_queue_delayed_work(hw, &sc->tx_complete_work, 0);
        mutex_unlock(&sc->mutex);
+       ath9k_ps_restore(sc);
 }
 
 struct ieee80211_ops ath9k_ops = {

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index bb1d29e..f977f80 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -2012,8 +2012,7 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
                spin_lock_bh(&txq->axq_lock);
                if (list_empty(&txq->axq_q)) {
                        txq->axq_link = NULL;
-                       if (sc->sc_flags & SC_OP_TXAGGR &&
-                           !txq->txq_flush_inprogress)
+                       if (sc->sc_flags & SC_OP_TXAGGR)
                                ath_txq_schedule(sc, txq);
                        spin_unlock_bh(&txq->axq_lock);
                        break;
@@ -2094,7 +2093,7 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
 
                spin_lock_bh(&txq->axq_lock);
 
-               if (sc->sc_flags & SC_OP_TXAGGR && !txq->txq_flush_inprogress)
+               if (sc->sc_flags & SC_OP_TXAGGR)
                        ath_txq_schedule(sc, txq);
                spin_unlock_bh(&txq->axq_lock);
        }
@@ -2265,18 +2264,17 @@ void ath_tx_edma_tasklet(struct ath_softc *sc)
 
                spin_lock_bh(&txq->axq_lock);
 
-               if (!txq->txq_flush_inprogress) {
-                       if (!list_empty(&txq->txq_fifo_pending)) {
-                               INIT_LIST_HEAD(&bf_head);
-                               bf = list_first_entry(&txq->txq_fifo_pending,
-                                                     struct ath_buf, list);
-                               list_cut_position(&bf_head,
-                                                 &txq->txq_fifo_pending,
-                                                 &bf->bf_lastbf->list);
-                               ath_tx_txqaddbuf(sc, txq, &bf_head);
-                       } else if (sc->sc_flags & SC_OP_TXAGGR)
-                               ath_txq_schedule(sc, txq);
-               }
+               if (!list_empty(&txq->txq_fifo_pending)) {
+                       INIT_LIST_HEAD(&bf_head);
+                       bf = list_first_entry(&txq->txq_fifo_pending,
+                                             struct ath_buf, list);
+                       list_cut_position(&bf_head,
+                                         &txq->txq_fifo_pending,
+                                         &bf->bf_lastbf->list);
+                       ath_tx_txqaddbuf(sc, txq, &bf_head);
+               } else if (sc->sc_flags & SC_OP_TXAGGR)
+                       ath_txq_schedule(sc, txq);
+
                spin_unlock_bh(&txq->axq_lock);
        }
 }