carl9170: don't load bogus nf of chain 1

According to Atheros, chain 1 is not connected.
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/carl9170/carl9170.h

@@ -321,7 +321,7 @@ struct ar9170 {
 
 	/* PHY */
 	struct ieee80211_channel *channel;
-	int noise[6];
+	int noise[4];
 	unsigned int chan_fail;
 	unsigned int total_chan_fail;
 	u8 heavy_clip;

drivers/net/wireless/ath/carl9170/debug.c

@@ -436,12 +436,10 @@ static char *carl9170_debugfs_phy_noise_read(struct ar9170 *ar, char *buf,
 		return buf;
 	}
 
-	ADD(buf, *len, bufsize, "Chain 1: %10d dBm, ext. chan.:%10d dBm\n",
-	    ar->noise[1], ar->noise[4]);
+	ADD(buf, *len, bufsize, "Chain 0: %10d dBm, ext. chan.:%10d dBm\n",
+	    ar->noise[0], ar->noise[2]);
 	ADD(buf, *len, bufsize, "Chain 2: %10d dBm, ext. chan.:%10d dBm\n",
-	    ar->noise[2], ar->noise[5]);
-	ADD(buf, *len, bufsize, "Combined %10d dBm, ext. chan.:%10d dBm\n",
-	    ar->noise[0], ar->noise[3]);
+	    ar->noise[1], ar->noise[3]);
 
 	return buf;
 }

drivers/net/wireless/ath/carl9170/phy.c

@@ -1566,9 +1566,8 @@ static int carl9170_calc_noise_dbm(u32 raw_noise)
 int carl9170_get_noisefloor(struct ar9170 *ar)
 {
 	static const u32 phy_regs[] = {
-		AR9170_PHY_REG_CCA, AR9170_PHY_REG_CH1_CCA,
-		AR9170_PHY_REG_CH2_CCA, AR9170_PHY_REG_EXT_CCA,
-		AR9170_PHY_REG_CH1_EXT_CCA, AR9170_PHY_REG_CH2_EXT_CCA };
+		AR9170_PHY_REG_CCA, AR9170_PHY_REG_CH2_CCA,
+		AR9170_PHY_REG_EXT_CCA, AR9170_PHY_REG_CH2_EXT_CCA };
 	u32 phy_res[ARRAY_SIZE(phy_regs)];
 	int err, i;
 
@@ -1578,12 +1577,12 @@ int carl9170_get_noisefloor(struct ar9170 *ar)
 	if (err)
 		return err;
 
-	for (i = 0; i < 3; i++) {
+	for (i = 0; i < 2; i++) {
 		ar->noise[i] = carl9170_calc_noise_dbm(
 			(phy_res[i] >> 19) & 0x1ff);
 
-		ar->noise[i + 3] = carl9170_calc_noise_dbm(
-			(phy_res[i + 3] >> 23) & 0x1ff);
+		ar->noise[i + 2] = carl9170_calc_noise_dbm(
+			(phy_res[i + 2] >> 23) & 0x1ff);
 	}
 
 	return 0;