ath9k: get rid of most of those annoying dma tx stop issues

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25988 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 76 insertions, 0 deletions

diff --git a/package/mac80211/patches/572-ath9k_fix_tx_flush.patch b/package/mac80211/patches/572-ath9k_fix_tx_flush.patch
new file mode 100644
index 0000000000..55d127edfb
--- /dev/null
+++ b/package/mac80211/patches/572-ath9k_fix_tx_flush.patch
@@ -0,0 +1,76 @@
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -2149,54 +2149,37 @@ static void ath9k_set_coverage_class(str
+ 
+ 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 = 60; /* ms */
++	int i, j;
+ 
+ 	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) {
+-			for (j = 0; j < ATH_FLUSH_TIMEOUT; j++) {
+-				if (!ath9k_has_pending_frames(sc, txq))
+-					break;
+-				usleep_range(1000, 2000);
+-			}
+-		}
++	if (drop)
++		timeout = 1;
+ 
+-		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;
++	for (j = 0; j < timeout; j++) {
++		int npend = 0;
++		for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
++			if (!ATH_TXQ_SETUP(sc, i))
++				continue;
+ 
+-			ath_draintxq(sc, txq, false);
+-			txq->txq_flush_inprogress = false;
++			npend += ath9k_has_pending_frames(sc, &sc->tx.txq[i]);
+ 		}
+-	}
+ 
+-	if (npend) {
+-		ath_reset(sc, false);
+-		txq->txq_flush_inprogress = false;
++		if (!npend)
++		    goto out;
++
++		usleep_range(1000, 2000);
+ 	}
+ 
++	ath9k_ps_wakeup(sc);
++	ath_drain_all_txq(sc, false);
++	ath9k_ps_restore(sc);
++
++out:
+ 	ieee80211_queue_delayed_work(hw, &sc->tx_complete_work, 0);
+ 	mutex_unlock(&sc->mutex);
+ }