1 files changed, 96 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/305-ath9k-limit-retries-for-powersave-response-frames.patch b/package/kernel/mac80211/patches/305-ath9k-limit-retries-for-powersave-response-frames.patch
new file mode 100644
index 0000000000..5923594be3
--- /dev/null
+++ b/package/kernel/mac80211/patches/305-ath9k-limit-retries-for-powersave-response-frames.patch
@@ -0,0 +1,96 @@
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Thu, 2 Jul 2015 15:20:56 +0200
+Subject: [PATCH] ath9k: limit retries for powersave response frames
+
+In some cases, the channel might be busy enough that an ath9k AP's
+response to PS-Poll frames might be too slow and the station has already
+gone to sleep. To avoid wasting too much airtime on this, limit the
+number of retries on such frames and ensure that no sample rate gets
+used.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -188,10 +188,25 @@ static void ath_send_bar(struct ath_atx_
+ }
+ 
+ static void ath_set_rates(struct ieee80211_vif *vif, struct ieee80211_sta *sta,
+-			  struct ath_buf *bf)
++			  struct ath_buf *bf, bool ps)
+ {
++	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(bf->bf_mpdu);
++
++	if (ps) {
++		/* Clear the first rate to avoid using a sample rate for PS frames */
++		info->control.rates[0].idx = -1;
++		info->control.rates[0].count = 0;
++	}
++
+ 	ieee80211_get_tx_rates(vif, sta, bf->bf_mpdu, bf->rates,
+ 			       ARRAY_SIZE(bf->rates));
++	if (!ps)
++		return;
++
++	if (bf->rates[0].count > 2)
++		bf->rates[0].count = 2;
++
++	bf->rates[1].idx = -1;
+ }
+ 
+ static void ath_txq_skb_done(struct ath_softc *sc, struct ath_txq *txq,
+@@ -1522,7 +1537,7 @@ ath_tx_form_burst(struct ath_softc *sc,
+ 			break;
+ 		}
+ 
+-		ath_set_rates(tid->an->vif, tid->an->sta, bf);
++		ath_set_rates(tid->an->vif, tid->an->sta, bf, false);
+ 	} while (1);
+ }
+ 
+@@ -1552,7 +1567,7 @@ static bool ath_tx_sched_aggr(struct ath
+ 		return false;
+ 	}
+ 
+-	ath_set_rates(tid->an->vif, tid->an->sta, bf);
++	ath_set_rates(tid->an->vif, tid->an->sta, bf, false);
+ 	if (aggr)
+ 		aggr_len = ath_tx_form_aggr(sc, txq, tid, &bf_q, bf);
+ 	else
+@@ -1710,7 +1725,7 @@ void ath9k_release_buffered_frames(struc
+ 				break;
+ 
+ 			list_add_tail(&bf->list, &bf_q);
+-			ath_set_rates(tid->an->vif, tid->an->sta, bf);
++			ath_set_rates(tid->an->vif, tid->an->sta, bf, true);
+ 			if (bf_isampdu(bf)) {
+ 				ath_tx_addto_baw(sc, tid, bf);
+ 				bf->bf_state.bf_type &= ~BUF_AGGR;
+@@ -2410,7 +2425,7 @@ int ath_tx_start(struct ieee80211_hw *hw
+ 	if (txctl->paprd)
+ 		bf->bf_state.bfs_paprd_timestamp = jiffies;
+ 
+-	ath_set_rates(vif, sta, bf);
++	ath_set_rates(vif, sta, bf, ps_resp);
+ 	ath_tx_send_normal(sc, txq, tid, skb);
+ 
+ out:
+@@ -2449,7 +2464,7 @@ void ath_tx_cabq(struct ieee80211_hw *hw
+ 			break;
+ 
+ 		bf->bf_lastbf = bf;
+-		ath_set_rates(vif, NULL, bf);
++		ath_set_rates(vif, NULL, bf, false);
+ 		ath_buf_set_rate(sc, bf, &info, fi->framelen, false);
+ 		duration += info.rates[0].PktDuration;
+ 		if (bf_tail)
+@@ -2968,7 +2983,7 @@ int ath9k_tx99_send(struct ath_softc *sc
+ 		return -EINVAL;
+ 	}
+ 
+-	ath_set_rates(sc->tx99_vif, NULL, bf);
++	ath_set_rates(sc->tx99_vif, NULL, bf, false);
+ 
+ 	ath9k_hw_set_desc_link(sc->sc_ah, bf->bf_desc, bf->bf_daddr);
+ 	ath9k_hw_tx99_start(sc->sc_ah, txctl->txq->axq_qnum);