linux-kernel - [PATCH 3.2 03/52] mac80211: fix driver RSSI event calculations

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Message-ID: <lsq.1448404439.514697775@decadent.org.uk>
Date:	Tue, 24 Nov 2015 22:33:59 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Johannes Berg" <johannes.berg@...el.com>
Subject: [PATCH 3.2 03/52] mac80211: fix driver RSSI event calculations

3.2.74-rc1 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: Ben Hutchings <ben@...adent.org.uk>
---
 net/mac80211/mlme.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1840,7 +1840,7 @@ static void ieee80211_rx_mgmt_beacon(str
 
 	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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