ath5k: fix regression in tx status processing

commit 7ede612fd615abcda0cc30e5bef2a70f4cf4f75c upstream.

The regression was introduced in the following commit:

0967e01e8e713ed2982fb4eba8ba13794e9a6e89
"ath5k: make use of the new rate control API"

ath5k_tx_frame_completed saves the intended per-rate retry counts before
they are cleared by ieee80211_tx_info_clear_status, however at this
point the information in info->status.rates is incomplete.

This causes significant throughput degradation and excessive packet loss
on links where high bit rates don't work properly.

Move the copy from bf->rates a few lines up to ensure that the saved
retry counts are updated, and that they are really cleared in
info->status.rates after the call to ieee80211_tx_info_clear_status.

Cc: Thomas Huehn <thomas@net.t-labs.tu-berlin.de>
Cc: Benjamin Vahl <bvahl@net.t-labs.tu-berlin.de>
Reported-by: Ben West <ben@gowasabi.net>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Acked-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index 48161ed..69f58b0 100644 (file)
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -1663,15 +1663,15 @@ ath5k_tx_frame_completed(struct ath5k_hw *ah, struct sk_buff *skb,
        ah->stats.tx_bytes_count += skb->len;
        info = IEEE80211_SKB_CB(skb);
 
+       size = min_t(int, sizeof(info->status.rates), sizeof(bf->rates));
+       memcpy(info->status.rates, bf->rates, size);
+
        tries[0] = info->status.rates[0].count;
        tries[1] = info->status.rates[1].count;
        tries[2] = info->status.rates[2].count;
 
        ieee80211_tx_info_clear_status(info);
 
-       size = min_t(int, sizeof(info->status.rates), sizeof(bf->rates));
-       memcpy(info->status.rates, bf->rates, size);
-
        for (i = 0; i < ts->ts_final_idx; i++) {
                struct ieee80211_tx_rate *r =
                        &info->status.rates[i];