ath9k: move qual processing into a helper

This moves the qual computing into a small helper,
ath9k_compute_qual()
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/recv.c

@@ -189,6 +189,47 @@ static u8 ath9k_process_rate(struct ath_common *common,
         return 0;
 }
 
+/*
+ * Theory for reporting quality:
+ *
+ * At a hardware RSSI of 45 you will be able to use MCS 7  reliably.
+ * At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
+ * At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
+ *
+ * MCS 7  is the highets MCS index usable by a 1-stream device.
+ * MCS 15 is the highest MCS index usable by a 2-stream device.
+ *
+ * All ath9k devices are either 1-stream or 2-stream.
+ *
+ * How many bars you see is derived from the qual reporting.
+ *
+ * A more elaborate scheme can be used here but it requires tables
+ * of SNR/throughput for each possible mode used. For the MCS table
+ * you can refer to the wireless wiki:
+ *
+ * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
+ *
+ */
+static int ath9k_compute_qual(struct ieee80211_hw *hw,
+			      struct ath_rx_status *rx_stats)
+{
+	int qual;
+
+	if (conf_is_ht(&hw->conf))
+		qual =  rx_stats->rs_rssi * 100 / 45;
+	else
+		qual =  rx_stats->rs_rssi * 100 / 35;
+
+	/*
+	 * rssi can be more than 45 though, anything above that
+	 * should be considered at 100%
+	 */
+	if (qual > 100)
+		qual = 100;
+
+	return qual;
+}
+
 /*
  * For Decrypt or Demic errors, we only mark packet status here and always push
  * up the frame up to let mac80211 handle the actual error case, be it no
@@ -247,38 +288,7 @@ static int ath_rx_prepare(struct ath_common *common,
 	rx_status->noise = common->ani.noise_floor;
 	rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
 	rx_status->antenna = rx_stats->rs_antenna;
-
-	/*
-	 * Theory for reporting quality:
-	 *
-	 * At a hardware RSSI of 45 you will be able to use MCS 7  reliably.
-	 * At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
-	 * At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
-	 *
-	 * MCS 7  is the highets MCS index usable by a 1-stream device.
-	 * MCS 15 is the highest MCS index usable by a 2-stream device.
-	 *
-	 * All ath9k devices are either 1-stream or 2-stream.
-	 *
-	 * How many bars you see is derived from the qual reporting.
-	 *
-	 * A more elaborate scheme can be used here but it requires tables
-	 * of SNR/throughput for each possible mode used. For the MCS table
-	 * you can refer to the wireless wiki:
-	 *
-	 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
-	 *
-	 */
-	if (conf_is_ht(&hw->conf))
-		rx_status->qual =  rx_stats->rs_rssi * 100 / 45;
-	else
-		rx_status->qual =  rx_stats->rs_rssi * 100 / 35;
-
-	/* rssi can be more than 45 though, anything above that
-	 * should be considered at 100% */
-	if (rx_status->qual > 100)
-		rx_status->qual = 100;
-
+	rx_status->qual = ath9k_compute_qual(hw, rx_stats);
 	rx_status->flag |= RX_FLAG_TSFT;
 
 	return 1;