ath9k: Fix TSF processing

There is no need to calculate the mactime for chained
descriptor packets, so make sure that this is done
only for the last fragment of valid packets.
Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -913,6 +913,22 @@ static void ath9k_process_rssi(struct ath_common *common,
 	ah->stats.avgbrssi = rssi;
 }
 
+static void ath9k_process_tsf(struct ath_rx_status *rs,
+			      struct ieee80211_rx_status *rxs,
+			      u64 tsf)
+{
+	u32 tsf_lower = tsf & 0xffffffff;
+
+	rxs->mactime = (tsf & ~0xffffffffULL) | rs->rs_tstamp;
+	if (rs->rs_tstamp > tsf_lower &&
+	    unlikely(rs->rs_tstamp - tsf_lower > 0x10000000))
+		rxs->mactime -= 0x100000000ULL;
+
+	if (rs->rs_tstamp < tsf_lower &&
+	    unlikely(tsf_lower - rs->rs_tstamp > 0x10000000))
+		rxs->mactime += 0x100000000ULL;
+}
+
 /*
  * 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
@@ -922,7 +938,7 @@ static int ath9k_rx_skb_preprocess(struct ath_softc *sc,
 				   struct ieee80211_hdr *hdr,
 				   struct ath_rx_status *rx_stats,
 				   struct ieee80211_rx_status *rx_status,
-				   bool *decrypt_error)
+				   bool *decrypt_error, u64 tsf)
 {
 	struct ieee80211_hw *hw = sc->hw;
 	struct ath_hw *ah = sc->sc_ah;
@@ -959,6 +975,8 @@ static int ath9k_rx_skb_preprocess(struct ath_softc *sc,
 	if (rx_stats->rs_more)
 		return 0;
 
+	ath9k_process_tsf(rx_stats, rx_status, tsf);
+
 	/*
 	 * everything but the rate is checked here, the rate check is done
 	 * separately to avoid doing two lookups for a rate for each frame.
@@ -1196,7 +1214,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 	bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
 	int dma_type;
 	u64 tsf = 0;
-	u32 tsf_lower = 0;
 	unsigned long flags;
 	dma_addr_t new_buf_addr;
 
@@ -1208,7 +1225,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 	qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
 
 	tsf = ath9k_hw_gettsf64(ah);
-	tsf_lower = tsf & 0xffffffff;
 
 	do {
 		bool decrypt_error = false;
@@ -1249,15 +1265,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 		rxs = IEEE80211_SKB_RXCB(hdr_skb);
 		memset(rxs, 0, sizeof(struct ieee80211_rx_status));
 
-		rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
-		if (rs.rs_tstamp > tsf_lower &&
-		    unlikely(rs.rs_tstamp - tsf_lower > 0x10000000))
-			rxs->mactime -= 0x100000000ULL;
-
-		if (rs.rs_tstamp < tsf_lower &&
-		    unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
-			rxs->mactime += 0x100000000ULL;
-
 		if (rs.rs_status & ATH9K_RXERR_PHY) {
 			ath9k_dfs_process_phyerr(sc, hdr, &rs, rxs->mactime);
 
@@ -1268,7 +1275,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 		}
 
 		retval = ath9k_rx_skb_preprocess(sc, hdr, &rs, rxs,
-						 &decrypt_error);
+						 &decrypt_error, tsf);
 		if (retval)
 			goto requeue_drop_frag;