mac80211: fix driver RSSI event calculations

commit 8ec6d97871f37e4743678ea4a455bd59580aa0f4 upstream.

The ifmgd->ave_beacon_signal value cannot be taken as is for
comparisons, it must be divided by since it's represented
like that for better accuracy of the EWMA calculations. This
would lead to invalid driver RSSI events. Fix the used value.

Fixes: 615f7b9bb1f8 ("mac80211: add driver RSSI threshold events")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index a59a78b6923d94c75415d88aba621c2302e98e3a..db469ec123871d0963172422b9c1a298badc839a 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2978,7 +2978,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 
        if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
            ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
-               int sig = ifmgd->ave_beacon_signal;
+               int sig = ifmgd->ave_beacon_signal / 16;
                int last_sig = ifmgd->last_ave_beacon_signal;
 
                /*