From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 19 Dec 2011 15:51:20 +0000 (+0000)
Subject: ath9k: fix another tx locking issue
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=eb3bd41114d0fc90cbb979ae6e464eeaa5b7b0f2;p=openwrt%2Fstaging%2Fthess.git

ath9k: fix another tx locking issue

SVN-Revision: 29570
---

diff --git a/package/mac80211/patches/565-ath9k_fix_lockup.patch b/package/mac80211/patches/565-ath9k_fix_lockup.patch
index c1721eba53..6bc9171c3e 100644
--- a/package/mac80211/patches/565-ath9k_fix_lockup.patch
+++ b/package/mac80211/patches/565-ath9k_fix_lockup.patch
@@ -1,25 +1,299 @@
 --- a/drivers/net/wireless/ath/ath9k/xmit.c
 +++ b/drivers/net/wireless/ath/ath9k/xmit.c
-@@ -189,8 +189,11 @@ static void ath_tx_flush_tid(struct ath_
+@@ -104,6 +104,29 @@ static int ath_max_4ms_framelen[4][32] =
+ /* Aggregation logic */
+ /*********************/
+ 
++static void ath_txq_lock(struct ath_softc *sc, struct ath_txq *txq)
++{
++	spin_lock_bh(&txq->axq_lock);
++}
++
++static void ath_txq_unlock(struct ath_softc *sc, struct ath_txq *txq)
++{
++	spin_unlock_bh(&txq->axq_lock);
++}
++
++static void ath_txq_unlock_complete(struct ath_softc *sc, struct ath_txq *txq)
++{
++	struct sk_buff_head q;
++	struct sk_buff *skb;
++
++	__skb_queue_head_init(&q);
++	skb_queue_splice_init(&txq->complete_q, &q);
++	spin_unlock_bh(&txq->axq_lock);
++
++	while ((skb = __skb_dequeue(&q)))
++		ieee80211_tx_status(sc->hw, skb);
++}
++
+ static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid)
+ {
+ 	struct ath_atx_ac *ac = tid->ac;
+@@ -130,7 +153,7 @@ static void ath_tx_resume_tid(struct ath
+ 
+ 	WARN_ON(!tid->paused);
+ 
+-	spin_lock_bh(&txq->axq_lock);
++	ath_txq_lock(sc, txq);
+ 	tid->paused = false;
+ 
+ 	if (skb_queue_empty(&tid->buf_q))
+@@ -139,7 +162,7 @@ static void ath_tx_resume_tid(struct ath
+ 	ath_tx_queue_tid(txq, tid);
+ 	ath_txq_schedule(sc, txq);
+ unlock:
+-	spin_unlock_bh(&txq->axq_lock);
++	ath_txq_unlock_complete(sc, txq);
+ }
+ 
+ static struct ath_frame_info *get_frame_info(struct sk_buff *skb)
+@@ -189,8 +212,11 @@ static void ath_tx_flush_tid(struct ath_
  		tid->state &= ~AGGR_CLEANUP;
  	}
  
 -	if (sendbar)
 +	if (sendbar) {
-+		spin_unlock_bh(&txq->axq_lock);
++		ath_txq_unlock(sc, txq);
  		ath_send_bar(tid, tid->seq_start);
-+		spin_lock_bh(&txq->axq_lock);
++		ath_txq_lock(sc, txq);
 +	}
  }
  
  static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
-@@ -566,7 +569,9 @@ static void ath_tx_complete_aggr(struct 
+@@ -564,13 +590,6 @@ static void ath_tx_complete_aggr(struct 
+ 		bf = bf_next;
+ 	}
+ 
+-	if (bar_index >= 0) {
+-		u16 bar_seq = ATH_BA_INDEX2SEQ(seq_first, bar_index);
+-		ath_send_bar(tid, ATH_BA_INDEX2SEQ(seq_first, bar_index + 1));
+-		if (BAW_WITHIN(tid->seq_start, tid->baw_size, bar_seq))
+-			tid->bar_index = ATH_BA_INDEX(tid->seq_start, bar_seq);
+-	}
+-
+ 	/* prepend un-acked frames to the beginning of the pending frame queue */
+ 	if (!skb_queue_empty(&bf_pending)) {
+ 		if (an->sleeping)
+@@ -585,6 +604,17 @@ static void ath_tx_complete_aggr(struct 
+ 		}
+ 	}
+ 
++	if (bar_index >= 0) {
++		u16 bar_seq = ATH_BA_INDEX2SEQ(seq_first, bar_index);
++
++		if (BAW_WITHIN(tid->seq_start, tid->baw_size, bar_seq))
++			tid->bar_index = ATH_BA_INDEX(tid->seq_start, bar_seq);
++
++		ath_txq_unlock(sc, txq);
++		ath_send_bar(tid, ATH_BA_INDEX2SEQ(seq_first, bar_index + 1));
++		ath_txq_lock(sc, txq);
++	}
++
+ 	if (tid->state & AGGR_CLEANUP)
+ 		ath_tx_flush_tid(sc, tid);
+ 
+@@ -1183,7 +1213,7 @@ void ath_tx_aggr_stop(struct ath_softc *
+ 		return;
+ 	}
+ 
+-	spin_lock_bh(&txq->axq_lock);
++	ath_txq_lock(sc, txq);
+ 	txtid->paused = true;
+ 
+ 	/*
+@@ -1198,7 +1228,7 @@ void ath_tx_aggr_stop(struct ath_softc *
+ 		txtid->state &= ~AGGR_ADDBA_COMPLETE;
+ 
+ 	ath_tx_flush_tid(sc, txtid);
+-	spin_unlock_bh(&txq->axq_lock);
++	ath_txq_unlock_complete(sc, txq);
+ }
+ 
+ void ath_tx_aggr_sleep(struct ieee80211_sta *sta, struct ath_softc *sc,
+@@ -1219,7 +1249,7 @@ void ath_tx_aggr_sleep(struct ieee80211_
+ 		ac = tid->ac;
+ 		txq = ac->txq;
+ 
+-		spin_lock_bh(&txq->axq_lock);
++		ath_txq_lock(sc, txq);
+ 
+ 		buffered = !skb_queue_empty(&tid->buf_q);
+ 
+@@ -1231,7 +1261,7 @@ void ath_tx_aggr_sleep(struct ieee80211_
+ 			list_del(&ac->list);
+ 		}
+ 
+-		spin_unlock_bh(&txq->axq_lock);
++		ath_txq_unlock(sc, txq);
+ 
+ 		ieee80211_sta_set_buffered(sta, tidno, buffered);
+ 	}
+@@ -1250,7 +1280,7 @@ void ath_tx_aggr_wakeup(struct ath_softc
+ 		ac = tid->ac;
+ 		txq = ac->txq;
+ 
+-		spin_lock_bh(&txq->axq_lock);
++		ath_txq_lock(sc, txq);
+ 		ac->clear_ps_filter = true;
+ 
+ 		if (!skb_queue_empty(&tid->buf_q) && !tid->paused) {
+@@ -1258,7 +1288,7 @@ void ath_tx_aggr_wakeup(struct ath_softc
+ 			ath_txq_schedule(sc, txq);
+ 		}
+ 
+-		spin_unlock_bh(&txq->axq_lock);
++		ath_txq_unlock_complete(sc, txq);
+ 	}
+ }
+ 
+@@ -1358,6 +1388,7 @@ struct ath_txq *ath_txq_setup(struct ath
+ 		txq->axq_qnum = axq_qnum;
+ 		txq->mac80211_qnum = -1;
+ 		txq->axq_link = NULL;
++		__skb_queue_head_init(&txq->complete_q);
+ 		INIT_LIST_HEAD(&txq->axq_q);
+ 		INIT_LIST_HEAD(&txq->axq_acq);
+ 		spin_lock_init(&txq->axq_lock);
+@@ -1482,7 +1513,8 @@ static void ath_drain_txq_list(struct at
+  */
+ void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
+ {
+-	spin_lock_bh(&txq->axq_lock);
++	ath_txq_lock(sc, txq);
++
+ 	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
+ 		int idx = txq->txq_tailidx;
+ 
+@@ -1503,7 +1535,7 @@ void ath_draintxq(struct ath_softc *sc, 
+ 	if ((sc->sc_flags & SC_OP_TXAGGR) && !retry_tx)
+ 		ath_txq_drain_pending_buffers(sc, txq);
+ 
+-	spin_unlock_bh(&txq->axq_lock);
++	ath_txq_unlock_complete(sc, txq);
+ }
+ 
+ bool ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
+@@ -1947,7 +1979,7 @@ int ath_tx_start(struct ieee80211_hw *hw
+ 
+ 	q = skb_get_queue_mapping(skb);
+ 
+-	spin_lock_bh(&txq->axq_lock);
++	ath_txq_lock(sc, txq);
+ 
+ 	if (txq == sc->tx.txq_map[q] &&
+ 	    ++txq->pending_frames > ATH_MAX_QDEPTH && !txq->stopped) {
+@@ -1957,7 +1989,7 @@ int ath_tx_start(struct ieee80211_hw *hw
+ 
+ 	ath_tx_start_dma(sc, skb, txctl, tid);
+ 
+-	spin_unlock_bh(&txq->axq_lock);
++	ath_txq_unlock(sc, txq);
+ 
+ 	return 0;
+ }
+@@ -1969,7 +2001,6 @@ int ath_tx_start(struct ieee80211_hw *hw
+ static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
+ 			    int tx_flags, struct ath_txq *txq)
+ {
+-	struct ieee80211_hw *hw = sc->hw;
+ 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ 	struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data;
+@@ -2013,7 +2044,7 @@ static void ath_tx_complete(struct ath_s
+ 		}
+ 	}
+ 
+-	ieee80211_tx_status(hw, skb);
++	__skb_queue_tail(&txq->complete_q, skb);
+ }
+ 
+ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
+@@ -2149,7 +2180,7 @@ static void ath_tx_processq(struct ath_s
+ 		txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
+ 		txq->axq_link);
+ 
+-	spin_lock_bh(&txq->axq_lock);
++	ath_txq_lock(sc, txq);
+ 	for (;;) {
+ 		if (work_pending(&sc->hw_reset_work))
+ 			break;
+@@ -2208,7 +2239,7 @@ static void ath_tx_processq(struct ath_s
+ 
+ 		ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
+ 	}
+-	spin_unlock_bh(&txq->axq_lock);
++	ath_txq_unlock_complete(sc, txq);
+ }
+ 
+ static void ath_tx_complete_poll_work(struct work_struct *work)
+@@ -2225,17 +2256,17 @@ static void ath_tx_complete_poll_work(st
+ 	for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++)
+ 		if (ATH_TXQ_SETUP(sc, i)) {
+ 			txq = &sc->tx.txq[i];
+-			spin_lock_bh(&txq->axq_lock);
++			ath_txq_lock(sc, txq);
+ 			if (txq->axq_depth) {
+ 				if (txq->axq_tx_inprogress) {
+ 					needreset = true;
+-					spin_unlock_bh(&txq->axq_lock);
++					ath_txq_unlock(sc, txq);
+ 					break;
+ 				} else {
+ 					txq->axq_tx_inprogress = true;
+ 				}
+ 			}
+-			spin_unlock_bh(&txq->axq_lock);
++			ath_txq_unlock_complete(sc, txq);
+ 		}
+ 
+ 	if (needreset) {
+@@ -2293,10 +2324,10 @@ void ath_tx_edma_tasklet(struct ath_soft
+ 
+ 		txq = &sc->tx.txq[ts.qid];
+ 
+-		spin_lock_bh(&txq->axq_lock);
++		ath_txq_lock(sc, txq);
+ 
+ 		if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
+-			spin_unlock_bh(&txq->axq_lock);
++			ath_txq_unlock(sc, txq);
+ 			return;
+ 		}
+ 
+@@ -2322,7 +2353,7 @@ void ath_tx_edma_tasklet(struct ath_soft
+ 		}
+ 
+ 		ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
+-		spin_unlock_bh(&txq->axq_lock);
++		ath_txq_unlock_complete(sc, txq);
+ 	}
+ }
+ 
+@@ -2460,7 +2491,7 @@ void ath_tx_node_cleanup(struct ath_soft
+ 		ac = tid->ac;
+ 		txq = ac->txq;
+ 
+-		spin_lock_bh(&txq->axq_lock);
++		ath_txq_lock(sc, txq);
  
- 	if (bar_index >= 0) {
- 		u16 bar_seq = ATH_BA_INDEX2SEQ(seq_first, bar_index);
-+		spin_unlock_bh(&txq->axq_lock);
- 		ath_send_bar(tid, ATH_BA_INDEX2SEQ(seq_first, bar_index + 1));
-+		spin_lock_bh(&txq->axq_lock);
- 		if (BAW_WITHIN(tid->seq_start, tid->baw_size, bar_seq))
- 			tid->bar_index = ATH_BA_INDEX(tid->seq_start, bar_seq);
+ 		if (tid->sched) {
+ 			list_del(&tid->list);
+@@ -2476,6 +2507,6 @@ void ath_tx_node_cleanup(struct ath_soft
+ 		tid->state &= ~AGGR_ADDBA_COMPLETE;
+ 		tid->state &= ~AGGR_CLEANUP;
+ 
+-		spin_unlock_bh(&txq->axq_lock);
++		ath_txq_unlock(sc, txq);
  	}
+ }
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -196,6 +196,7 @@ struct ath_txq {
+ 	u8 txq_headidx;
+ 	u8 txq_tailidx;
+ 	int pending_frames;
++	struct sk_buff_head complete_q;
+ };
+ 
+ struct ath_atx_ac {