mac80211: reduce IEEE80211_TX_MAX_RATES

IEEE80211_TX_MAX_RATES can be reduced from 5 to 4 as there
is no current hardware supporting a rate chain with 5 multi
rate stages (mrr), so 4 mrr stages are sufficient.

The memory that is freed within the ieee80211_tx_info struct
will be used in the upcoming Transmission Power Control (TPC)
implementation.

Suggested-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de>
[reword commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/carl9170/tx.c b/drivers/net/wireless/ath/carl9170/tx.c
index aed305177af6..ede0b572cebc 100644
--- a/drivers/net/wireless/ath/carl9170/tx.c
+++ b/drivers/net/wireless/ath/carl9170/tx.c
@@ -277,11 +277,11 @@ static void carl9170_tx_release(struct kref *ref)
                 return;
 
         BUILD_BUG_ON(
-            offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
+            offsetof(struct ieee80211_tx_info, status.ack_signal) != 20);
 
-        memset(&txinfo->status.ampdu_ack_len, 0,
+        memset(&txinfo->status.ack_signal, 0,
                sizeof(struct ieee80211_tx_info) -
-               offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
+               offsetof(struct ieee80211_tx_info, status.ack_signal));
 
         if (atomic_read(&ar->tx_total_queued))
                 ar->tx_schedule = true;