ath9k: use one shot read in ath9k_hw_update_mibstats

this will reduce some overhead on usb bus.
Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -107,11 +107,21 @@ static const struct ani_cck_level_entry cck_level_table[] = {
 static void ath9k_hw_update_mibstats(struct ath_hw *ah,
 				     struct ath9k_mib_stats *stats)
 {
-	stats->ackrcv_bad += REG_READ(ah, AR_ACK_FAIL);
-	stats->rts_bad += REG_READ(ah, AR_RTS_FAIL);
-	stats->fcs_bad += REG_READ(ah, AR_FCS_FAIL);
-	stats->rts_good += REG_READ(ah, AR_RTS_OK);
-	stats->beacons += REG_READ(ah, AR_BEACON_CNT);
+	u32 addr[5] = {AR_RTS_OK, AR_RTS_FAIL, AR_ACK_FAIL,
+		       AR_FCS_FAIL, AR_BEACON_CNT};
+	u32 data[5];
+
+	REG_READ_MULTI(ah, &addr[0], &data[0], 5);
+	/* AR_RTS_OK */
+	stats->rts_good += data[0];
+	/* AR_RTS_FAIL */
+	stats->rts_bad += data[1];
+	/* AR_ACK_FAIL */
+	stats->ackrcv_bad += data[2];
+	/* AR_FCS_FAIL */
+	stats->fcs_bad += data[3];
+	/* AR_BEACON_CNT */
+	stats->beacons += data[4];
 }
 
 static void ath9k_ani_restart(struct ath_hw *ah)