1 files changed, 82 insertions, 0 deletions
diff --git a/package/mac80211/patches/461-ath5k_fix_short_preamble_dur.patch b/package/mac80211/patches/461-ath5k_fix_short_preamble_dur.patch
new file mode 100644
index 000000000..8d0a3e800
--- /dev/null
+++ b/package/mac80211/patches/461-ath5k_fix_short_preamble_dur.patch
@@ -0,0 +1,82 @@
+--- a/drivers/net/wireless/ath/ath5k/ath5k.h
++++ b/drivers/net/wireless/ath/ath5k/ath5k.h
+@@ -1233,7 +1233,7 @@ int ath5k_eeprom_read_mac(struct ath5k_h
+ /* Protocol Control Unit Functions */
+ /* Helpers */
+ int ath5k_hw_get_frame_duration(struct ath5k_hw *ah,
+-		int len, struct ieee80211_rate *rate);
++		int len, struct ieee80211_rate *rate, bool shortpre);
+ unsigned int ath5k_hw_get_default_slottime(struct ath5k_hw *ah);
+ unsigned int ath5k_hw_get_default_sifs(struct ath5k_hw *ah);
+ extern int ath5k_hw_set_opmode(struct ath5k_hw *ah, enum nl80211_iftype opmode);
+--- a/drivers/net/wireless/ath/ath5k/pcu.c
++++ b/drivers/net/wireless/ath/ath5k/pcu.c
+@@ -75,7 +75,7 @@ static const unsigned int ack_rates_high
+  * bwmodes.
+  */
+ int ath5k_hw_get_frame_duration(struct ath5k_hw *ah,
+-		int len, struct ieee80211_rate *rate)
++		int len, struct ieee80211_rate *rate, bool shortpre)
+ {
+ 	struct ath5k_softc *sc = ah->ah_sc;
+ 	int sifs, preamble, plcp_bits, sym_time;
+@@ -84,9 +84,15 @@ int ath5k_hw_get_frame_duration(struct a
+ 
+ 	/* Fallback */
+ 	if (!ah->ah_bwmode) {
+-		dur = ieee80211_generic_frame_duration(sc->hw,
+-						NULL, len, rate);
+-		return le16_to_cpu(dur);
++		__le16 raw_dur = ieee80211_generic_frame_duration(sc->hw,
++					NULL, len, rate);
++
++		/* subtract difference between long and short preamble */
++		dur = le16_to_cpu(raw_dur);
++		if (shortpre)
++			dur -= 96;
++
++		return dur;
+ 	}
+ 
+ 	bitrate = rate->bitrate;
+@@ -263,27 +269,14 @@ static inline void ath5k_hw_write_rate_d
+ 		 * actual rate for this rate. See mac80211 tx.c
+ 		 * ieee80211_duration() for a brief description of
+ 		 * what rate we should choose to TX ACKs. */
+-		tx_time = ath5k_hw_get_frame_duration(ah, 10, rate);
++		tx_time = ath5k_hw_get_frame_duration(ah, 10, rate, false);
+ 
+ 		ath5k_hw_reg_write(ah, tx_time, reg);
+ 
+ 		if (!(rate->flags & IEEE80211_RATE_SHORT_PREAMBLE))
+ 			continue;
+ 
+-		/*
+-		 * We're not distinguishing short preamble here,
+-		 * This is true, all we'll get is a longer value here
+-		 * which is not necessarilly bad. We could use
+-		 * export ieee80211_frame_duration() but that needs to be
+-		 * fixed first to be properly used by mac802111 drivers:
+-		 *
+-		 *  - remove erp stuff and let the routine figure ofdm
+-		 *    erp rates
+-		 *  - remove passing argument ieee80211_local as
+-		 *    drivers don't have access to it
+-		 *  - move drivers using ieee80211_generic_frame_duration()
+-		 *    to this
+-		 */
++		tx_time = ath5k_hw_get_frame_duration(ah, 10, rate, true);
+ 		ath5k_hw_reg_write(ah, tx_time,
+ 			reg + (AR5K_SET_SHORT_PREAMBLE << 2));
+ 	}
+--- a/drivers/net/wireless/ath/ath5k/qcu.c
++++ b/drivers/net/wireless/ath/ath5k/qcu.c
+@@ -550,7 +550,7 @@ int ath5k_hw_set_ifs_intervals(struct at
+ 	else
+ 		rate = &sc->sbands[IEEE80211_BAND_2GHZ].bitrates[0];
+ 
+-	ack_tx_time = ath5k_hw_get_frame_duration(ah, 10, rate);
++	ack_tx_time = ath5k_hw_get_frame_duration(ah, 10, rate, false);
+ 
+ 	/* ack_tx_time includes an SIFS already */
+ 	eifs = ack_tx_time + sifs + 2 * slot_time;