From afcc48648da36a06f4e6c3f929ab95f53266d5e0 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 29 Jun 2013 12:38:15 +0000
Subject: ath9k: fix tx queue pending frame counter when dropping packets

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37081 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../557-ath9k_fix_tx_queue_accounting.patch        | 95 ++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 package/kernel/mac80211/patches/557-ath9k_fix_tx_queue_accounting.patch

diff --git a/package/kernel/mac80211/patches/557-ath9k_fix_tx_queue_accounting.patch b/package/kernel/mac80211/patches/557-ath9k_fix_tx_queue_accounting.patch
new file mode 100644
index 0000000000..83dcdceda3
--- /dev/null
+++ b/package/kernel/mac80211/patches/557-ath9k_fix_tx_queue_accounting.patch
@@ -0,0 +1,95 @@
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -146,6 +146,28 @@ static void ath_set_rates(struct ieee802
+ 			       ARRAY_SIZE(bf->rates));
+ }
+ 
++static void ath_txq_skb_done(struct ath_softc *sc, struct ath_txq *txq,
++			     struct sk_buff *skb)
++{
++	int q;
++
++	q = skb_get_queue_mapping(skb);
++	if (txq == sc->tx.uapsdq)
++		txq = sc->tx.txq_map[q];
++
++	if (txq != sc->tx.txq_map[q])
++		return;
++
++	if (WARN_ON(--txq->pending_frames < 0))
++		txq->pending_frames = 0;
++
++	if (txq->stopped &&
++	    txq->pending_frames < sc->tx.txq_max_pending[q]) {
++		ieee80211_wake_queue(sc->hw, q);
++		txq->stopped = false;
++	}
++}
++
+ static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
+ {
+ 	struct ath_txq *txq = tid->ac->txq;
+@@ -167,6 +189,7 @@ static void ath_tx_flush_tid(struct ath_
+ 		if (!bf) {
+ 			bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ 			if (!bf) {
++				ath_txq_skb_done(sc, txq, skb);
+ 				ieee80211_free_txskb(sc->hw, skb);
+ 				continue;
+ 			}
+@@ -811,6 +834,7 @@ ath_tx_get_tid_subframe(struct ath_softc
+ 
+ 		if (!bf) {
+ 			__skb_unlink(skb, &tid->buf_q);
++			ath_txq_skb_done(sc, txq, skb);
+ 			ieee80211_free_txskb(sc->hw, skb);
+ 			continue;
+ 		}
+@@ -1824,6 +1848,7 @@ static void ath_tx_send_ampdu(struct ath
+ 
+ 	bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ 	if (!bf) {
++		ath_txq_skb_done(sc, txq, skb);
+ 		ieee80211_free_txskb(sc->hw, skb);
+ 		return;
+ 	}
+@@ -2090,6 +2115,7 @@ int ath_tx_start(struct ieee80211_hw *hw
+ 
+ 	bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ 	if (!bf) {
++		ath_txq_skb_done(sc, txq, skb);
+ 		if (txctl->paprd)
+ 			dev_kfree_skb_any(skb);
+ 		else
+@@ -2189,7 +2215,7 @@ static void ath_tx_complete(struct ath_s
+ 	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;
+-	int q, padpos, padsize;
++	int padpos, padsize;
+ 	unsigned long flags;
+ 
+ 	ath_dbg(common, XMIT, "TX complete: skb: %p\n", skb);
+@@ -2225,21 +2251,7 @@ static void ath_tx_complete(struct ath_s
+ 	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
+ 
+ 	__skb_queue_tail(&txq->complete_q, skb);
+-
+-	q = skb_get_queue_mapping(skb);
+-	if (txq == sc->tx.uapsdq)
+-		txq = sc->tx.txq_map[q];
+-
+-	if (txq == sc->tx.txq_map[q]) {
+-		if (WARN_ON(--txq->pending_frames < 0))
+-			txq->pending_frames = 0;
+-
+-		if (txq->stopped &&
+-		    txq->pending_frames < sc->tx.txq_max_pending[q]) {
+-			ieee80211_wake_queue(sc->hw, q);
+-			txq->stopped = false;
+-		}
+-	}
++	ath_txq_skb_done(sc, txq, skb);
+ }
+ 
+ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
-- 
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