ath9k: handle tx underrun in the driver instead of rate control

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/rc.c

@@ -1354,22 +1354,6 @@ static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
 		tx_info->status.ampdu_len = 1;
 	}
 
-	/*
-	 * If an underrun error is seen assume it as an excessive retry only
-	 * if max frame trigger level has been reached (2 KB for singel stream,
-	 * and 4 KB for dual stream). Adjust the long retry as if the frame was
-	 * tried hw->max_rate_tries times to affect how ratectrl updates PER for
-	 * the failed rate. In case of congestion on the bus penalizing these
-	 * type of underruns should help hardware actually transmit new frames
-	 * successfully by eventually preferring slower rates. This itself
-	 * should also alleviate congestion on the bus.
-	 */
-	if ((tx_info->pad[0] & ATH_TX_INFO_UNDERRUN) &&
-	    (sc->sc_ah->tx_trig_level >= ath_rc_priv->tx_triglevel_max)) {
-		tx_status = 1;
-		is_underrun = 1;
-	}
-
 	if (!(tx_info->flags & IEEE80211_TX_STAT_ACK))
 		tx_status = 1;
 
@@ -1596,8 +1580,6 @@ static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp
 		return NULL;
 	}
 
-	rate_priv->tx_triglevel_max = sc->sc_ah->caps.tx_triglevel_max;
-
 	return rate_priv;
 }