linux-kernel - [PATCH 3.16.y-ckt 087/126] mac80211: fix driver RSSI event calculations

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Message-Id: <1449653896-5236-88-git-send-email-luis.henriques@canonical.com>
Date:	Wed,  9 Dec 2015 09:37:37 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Johannes Berg <johannes.berg@...el.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 087/126] mac80211: fix driver RSSI event calculations

3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johannes Berg <johannes.berg@...el.com>

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@...el.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/mac80211/mlme.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index a59a78b6923d..db469ec12387 100644
--- 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;
 
 		/*
--
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