ath9k: optimize/fix ANI RSSI processing

ANI needs the RSSI average only in station mode, and only for tracking
the signal strength of beacons of the AP that it is connected to.
Adjust the code to track on the beacon RSSI, and store the average of that
in the ath_wiphy struct.
With these changes, we can get rid of this extra station lookup in the
rx path, which saves precious CPU cycles.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/virtual.c b/drivers/net/wireless/ath/ath9k/virtual.c
index ec7cf5ee56b..cb6c48be124 100644
--- a/drivers/net/wireless/ath/ath9k/virtual.c
+++ b/drivers/net/wireless/ath/ath9k/virtual.c
@@ -107,6 +107,7 @@ int ath9k_wiphy_add(struct ath_softc *sc)
         aphy->sc = sc;
         aphy->hw = hw;
         sc->sec_wiphy[i] = aphy;
+        aphy->last_rssi = ATH_RSSI_DUMMY_MARKER;
         spin_unlock_bh(&sc->wiphy_lock);
 
         memcpy(addr, common->macaddr, ETH_ALEN);