ath9k: fix rate control fallback rate selection

commit 5c0ba62fd4b2dce08055a89600f1d834f9f0fe9e upstream.

When selecting the tx fallback rate, rc.c used a separate variable
'nrix' for storing the next rate index, however it did not use that as
reference for further rate index lowering. Because of that, it ended up
reusing the same rate for multiple multi-rate retry stages, thus
decreasing delivery probability under changing link conditions.

This patch removes the separate (unnecessary) variable and fixes
fallback the way it was intended to work.
This should result in increased throughput and better link stability.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 8 deletions

diff --git a/drivers/net/wireless/ath/ath9k/rc.c b/drivers/net/wireless/ath/ath9k/rc.c
index 70fdb9d8db82..1d6cf7df7c66 100644
--- a/drivers/net/wireless/ath/ath9k/rc.c
+++ b/drivers/net/wireless/ath/ath9k/rc.c
@@ -668,7 +668,7 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
         struct ieee80211_tx_rate *rates = tx_info->control.rates;
         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
         __le16 fc = hdr->frame_control;
-        u8 try_per_rate, i = 0, rix, nrix;
+        u8 try_per_rate, i = 0, rix;
         int is_probe = 0;
 
         if (rate_control_send_low(sta, priv_sta, txrc))
@@ -688,26 +688,25 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
 
         rate_table = sc->cur_rate_table;
         rix = ath_rc_get_highest_rix(sc, ath_rc_priv, rate_table, &is_probe);
-        nrix = rix;
 
         if (is_probe) {
                 /* set one try for probe rates. For the
                  * probes don't enable rts */
                 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
-                                       1, nrix, 0);
+                                       1, rix, 0);
 
                 /* Get the next tried/allowed rate. No RTS for the next series
                  * after the probe rate
                  */
-                ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &nrix);
+                ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
                 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
-                                       try_per_rate, nrix, 0);
+                                       try_per_rate, rix, 0);
 
                 tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
         } else {
                 /* Set the choosen rate. No RTS for first series entry. */
                 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
-                                       try_per_rate, nrix, 0);
+                                       try_per_rate, rix, 0);
         }
 
         /* Fill in the other rates for multirate retry */
@@ -716,10 +715,10 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
                 if (i + 1 == 4)
                         try_per_rate = 4;
 
-                ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &nrix);
+                ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
                 /* All other rates in the series have RTS enabled */
                 ath_rc_rate_set_series(rate_table, &rates[i], txrc,
-                                       try_per_rate, nrix, 1);
+                                       try_per_rate, rix, 1);
         }
 
         /*