From: Felix Fietkau <nbd@openwrt.org>
Date: Fri, 22 Feb 2013 20:37:25 +0000 (+0100)
Subject: ath9k_htc: fix signal strength handling issues
X-Git-Tag: v3.9-rc2~24^2~15^2^2~5
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=838f427955dcfd16858b0108ce29029da0d56a4e;p=karo-tx-linux.git

ath9k_htc: fix signal strength handling issues

The ath9k commit 2ef167557c0a26c88162ecffb017bfcc51eb7b29
(ath9k: fix signal strength reporting issues) fixed an issue where the
reported per-frame signal strength reported to mac80211 was being
overwritten with an internal average. The same issue is also present
in ath9k_htc.
In addition to preventing the driver from overwriting the value, this
commit also ensures that the internal average (which is used for ANI)
only tracks beacons of the AP that we're connected to.

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

diff --git a/drivers/net/wireless/ath/ath9k/htc.h b/drivers/net/wireless/ath/ath9k/htc.h
index 96bfb18078fa..d3b099d7898b 100644
--- a/drivers/net/wireless/ath/ath9k/htc.h
+++ b/drivers/net/wireless/ath/ath9k/htc.h
@@ -22,6 +22,7 @@
 #include <linux/firmware.h>
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
+#include <linux/etherdevice.h>
 #include <linux/leds.h>
 #include <linux/slab.h>
 #include <net/mac80211.h>
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
index b6a5a08810b8..878862178e06 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
@@ -1067,15 +1067,19 @@ static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
 
 	last_rssi = priv->rx.last_rssi;
 
-	if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
-		rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
-						     ATH_RSSI_EP_MULTIPLIER);
+	if (ieee80211_is_beacon(hdr->frame_control) &&
+	    !is_zero_ether_addr(common->curbssid) &&
+	    ether_addr_equal(hdr->addr3, common->curbssid)) {
+		s8 rssi = rxbuf->rxstatus.rs_rssi;
 
-	if (rxbuf->rxstatus.rs_rssi < 0)
-		rxbuf->rxstatus.rs_rssi = 0;
+		if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
+			rssi = ATH_EP_RND(last_rssi, ATH_RSSI_EP_MULTIPLIER);
 
-	if (ieee80211_is_beacon(fc))
-		priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
+		if (rssi < 0)
+			rssi = 0;
+
+		priv->ah->stats.avgbrssi = rssi;
+	}
 
 	rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
 	rx_status->band = hw->conf.channel->band;