1 files changed, 443 insertions, 1073 deletions

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 262c81595f6..9105a92364f 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2009 Atheros Communications Inc.
+ * Copyright (c) 2008-2011 Atheros Communications Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -14,19 +14,11 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <linux/dma-mapping.h>
 #include "ath9k.h"
 #include "ar9003_mac.h"
 
-#define SKB_CB_ATHBUF(__skb)	(*((struct ath_buf **)__skb->cb))
-
-static inline bool ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta,
-					       int mindelta, int main_rssi_avg,
-					       int alt_rssi_avg, int pkt_count)
-{
-	return (((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
-		(alt_rssi_avg > main_rssi_avg + maxdelta)) ||
-		(alt_rssi_avg > main_rssi_avg + mindelta)) && (pkt_count > 50);
-}
+#define SKB_CB_ATHBUF(__skb)	(*((struct ath_rxbuf **)__skb->cb))
 
 static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
 {
@@ -34,27 +26,6 @@ static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
 	       (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP);
 }
 
-static struct ieee80211_hw * ath_get_virt_hw(struct ath_softc *sc,
-					     struct ieee80211_hdr *hdr)
-{
-	struct ieee80211_hw *hw = sc->pri_wiphy->hw;
-	int i;
-
-	spin_lock_bh(&sc->wiphy_lock);
-	for (i = 0; i < sc->num_sec_wiphy; i++) {
-		struct ath_wiphy *aphy = sc->sec_wiphy[i];
-		if (aphy == NULL)
-			continue;
-		if (compare_ether_addr(hdr->addr1, aphy->hw->wiphy->perm_addr)
-		    == 0) {
-			hw = aphy->hw;
-			break;
-		}
-	}
-	spin_unlock_bh(&sc->wiphy_lock);
-	return hw;
-}
-
 /*
  * Setup and link descriptors.
  *
@@ -63,15 +34,14 @@ static struct ieee80211_hw * ath_get_virt_hw(struct ath_softc *sc,
  * buffer (or rx fifo). This can incorrectly acknowledge packets
  * to a sender if last desc is self-linked.
  */
-static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
+static void ath_rx_buf_link(struct ath_softc *sc, struct ath_rxbuf *bf,
+			    bool flush)
 {
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath_desc *ds;
 	struct sk_buff *skb;
 
-	ATH_RXBUF_RESET(bf);
-
 	ds = bf->bf_desc;
 	ds->ds_link = 0; /* link to null */
 	ds->ds_data = bf->bf_buf_addr;
@@ -90,13 +60,21 @@ static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
 			     common->rx_bufsize,
 			     0);
 
-	if (sc->rx.rxlink == NULL)
-		ath9k_hw_putrxbuf(ah, bf->bf_daddr);
-	else
+	if (sc->rx.rxlink)
 		*sc->rx.rxlink = bf->bf_daddr;
+	else if (!flush)
+		ath9k_hw_putrxbuf(ah, bf->bf_daddr);
 
 	sc->rx.rxlink = &ds->ds_link;
-	ath9k_hw_rxena(ah);
+}
+
+static void ath_rx_buf_relink(struct ath_softc *sc, struct ath_rxbuf *bf,
+			      bool flush)
+{
+	if (sc->rx.buf_hold)
+		ath_rx_buf_link(sc, sc->rx.buf_hold, flush);
+
+	sc->rx.buf_hold = bf;
 }
 
 static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
@@ -135,61 +113,55 @@ static bool ath_rx_edma_buf_link(struct ath_softc *sc,
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_rx_edma *rx_edma;
 	struct sk_buff *skb;
-	struct ath_buf *bf;
+	struct ath_rxbuf *bf;
 
 	rx_edma = &sc->rx.rx_edma[qtype];
 	if (skb_queue_len(&rx_edma->rx_fifo) >= rx_edma->rx_fifo_hwsize)
 		return false;
 
-	bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
+	bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list);
 	list_del_init(&bf->list);
 
 	skb = bf->bf_mpdu;
 
-	ATH_RXBUF_RESET(bf);
 	memset(skb->data, 0, ah->caps.rx_status_len);
 	dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
 				ah->caps.rx_status_len, DMA_TO_DEVICE);
 
 	SKB_CB_ATHBUF(skb) = bf;
 	ath9k_hw_addrxbuf_edma(ah, bf->bf_buf_addr, qtype);
-	skb_queue_tail(&rx_edma->rx_fifo, skb);
+	__skb_queue_tail(&rx_edma->rx_fifo, skb);
 
 	return true;
 }
 
 static void ath_rx_addbuffer_edma(struct ath_softc *sc,
-				  enum ath9k_rx_qtype qtype, int size)
+				  enum ath9k_rx_qtype qtype)
 {
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
-	u32 nbuf = 0;
+	struct ath_rxbuf *bf, *tbf;
 
 	if (list_empty(&sc->rx.rxbuf)) {
-		ath_print(common, ATH_DBG_QUEUE, "No free rx buf available\n");
+		ath_dbg(common, QUEUE, "No free rx buf available\n");
 		return;
 	}
 
-	while (!list_empty(&sc->rx.rxbuf)) {
-		nbuf++;
-
+	list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list)
 		if (!ath_rx_edma_buf_link(sc, qtype))
 			break;
 
-		if (nbuf >= size)
-			break;
-	}
 }
 
 static void ath_rx_remove_buffer(struct ath_softc *sc,
 				 enum ath9k_rx_qtype qtype)
 {
-	struct ath_buf *bf;
+	struct ath_rxbuf *bf;
 	struct ath_rx_edma *rx_edma;
 	struct sk_buff *skb;
 
 	rx_edma = &sc->rx.rx_edma[qtype];
 
-	while ((skb = skb_dequeue(&rx_edma->rx_fifo)) != NULL) {
+	while ((skb = __skb_dequeue(&rx_edma->rx_fifo)) != NULL) {
 		bf = SKB_CB_ATHBUF(skb);
 		BUG_ON(!bf);
 		list_add_tail(&bf->list, &sc->rx.rxbuf);
@@ -198,26 +170,28 @@ static void ath_rx_remove_buffer(struct ath_softc *sc,
 
 static void ath_rx_edma_cleanup(struct ath_softc *sc)
 {
-	struct ath_buf *bf;
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ath_rxbuf *bf;
 
 	ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
 	ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
 
 	list_for_each_entry(bf, &sc->rx.rxbuf, list) {
-		if (bf->bf_mpdu)
+		if (bf->bf_mpdu) {
+			dma_unmap_single(sc->dev, bf->bf_buf_addr,
+					common->rx_bufsize,
+					DMA_BIDIRECTIONAL);
 			dev_kfree_skb_any(bf->bf_mpdu);
+			bf->bf_buf_addr = 0;
+			bf->bf_mpdu = NULL;
+		}
 	}
-
-	INIT_LIST_HEAD(&sc->rx.rxbuf);
-
-	kfree(sc->rx.rx_bufptr);
-	sc->rx.rx_bufptr = NULL;
 }
 
 static void ath_rx_edma_init_queue(struct ath_rx_edma *rx_edma, int size)
 {
-	skb_queue_head_init(&rx_edma->rx_fifo);
-	skb_queue_head_init(&rx_edma->rx_buffers);
+	__skb_queue_head_init(&rx_edma->rx_fifo);
 	rx_edma->rx_fifo_hwsize = size;
 }
 
@@ -226,15 +200,10 @@ static int ath_rx_edma_init(struct ath_softc *sc, int nbufs)
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct ath_hw *ah = sc->sc_ah;
 	struct sk_buff *skb;
-	struct ath_buf *bf;
+	struct ath_rxbuf *bf;
 	int error = 0, i;
 	u32 size;
 
-
-	common->rx_bufsize = roundup(IEEE80211_MAX_MPDU_LEN +
-				     ah->caps.rx_status_len,
-				     min(common->cachelsz, (u16)64));
-
 	ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize -
 				    ah->caps.rx_status_len);
 
@@ -243,13 +212,12 @@ static int ath_rx_edma_init(struct ath_softc *sc, int nbufs)
 	ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_HP],
 			       ah->caps.rx_hp_qdepth);
 
-	size = sizeof(struct ath_buf) * nbufs;
-	bf = kzalloc(size, GFP_KERNEL);
+	size = sizeof(struct ath_rxbuf) * nbufs;
+	bf = devm_kzalloc(sc->dev, size, GFP_KERNEL);
 	if (!bf)
 		return -ENOMEM;
 
 	INIT_LIST_HEAD(&sc->rx.rxbuf);
-	sc->rx.rx_bufptr = bf;
 
 	for (i = 0; i < nbufs; i++, bf++) {
 		skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_KERNEL);
@@ -269,7 +237,7 @@ static int ath_rx_edma_init(struct ath_softc *sc, int nbufs)
 				dev_kfree_skb_any(skb);
 				bf->bf_mpdu = NULL;
 				bf->bf_buf_addr = 0;
-				ath_print(common, ATH_DBG_FATAL,
+				ath_err(common,
 					"dma_mapping_error() on RX init\n");
 				error = -ENOMEM;
 				goto rx_init_fail;
@@ -287,21 +255,11 @@ rx_init_fail:
 
 static void ath_edma_start_recv(struct ath_softc *sc)
 {
-	spin_lock_bh(&sc->rx.rxbuflock);
-
 	ath9k_hw_rxena(sc->sc_ah);
-
-	ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_HP,
-			      sc->rx.rx_edma[ATH9K_RX_QUEUE_HP].rx_fifo_hwsize);
-
-	ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP,
-			      sc->rx.rx_edma[ATH9K_RX_QUEUE_LP].rx_fifo_hwsize);
-
+	ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_HP);
+	ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP);
 	ath_opmode_init(sc);
-
-	ath9k_hw_startpcureceive(sc->sc_ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
-
-	spin_unlock_bh(&sc->rx.rxbuflock);
+	ath9k_hw_startpcureceive(sc->sc_ah, !!(sc->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL));
 }
 
 static void ath_edma_stop_recv(struct ath_softc *sc)
@@ -314,59 +272,55 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
 {
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct sk_buff *skb;
-	struct ath_buf *bf;
+	struct ath_rxbuf *bf;
 	int error = 0;
 
 	spin_lock_init(&sc->sc_pcu_lock);
-	sc->sc_flags &= ~SC_OP_RXFLUSH;
-	spin_lock_init(&sc->rx.rxbuflock);
 
-	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
+	common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 +
+			     sc->sc_ah->caps.rx_status_len;
+
+	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
 		return ath_rx_edma_init(sc, nbufs);
-	} else {
-		common->rx_bufsize = roundup(IEEE80211_MAX_MPDU_LEN,
-				min(common->cachelsz, (u16)64));
 
-		ath_print(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n",
-				common->cachelsz, common->rx_bufsize);
+	ath_dbg(common, CONFIG, "cachelsz %u rxbufsize %u\n",
+		common->cachelsz, common->rx_bufsize);
 
-		/* Initialize rx descriptors */
+	/* Initialize rx descriptors */
 
-		error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
-				"rx", nbufs, 1, 0);
-		if (error != 0) {
-			ath_print(common, ATH_DBG_FATAL,
-				  "failed to allocate rx descriptors: %d\n",
-				  error);
+	error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
+				  "rx", nbufs, 1, 0);
+	if (error != 0) {
+		ath_err(common,
+			"failed to allocate rx descriptors: %d\n",
+			error);
+		goto err;
+	}
+
+	list_for_each_entry(bf, &sc->rx.rxbuf, list) {
+		skb = ath_rxbuf_alloc(common, common->rx_bufsize,
+				      GFP_KERNEL);
+		if (skb == NULL) {
+			error = -ENOMEM;
 			goto err;
 		}
 
-		list_for_each_entry(bf, &sc->rx.rxbuf, list) {
-			skb = ath_rxbuf_alloc(common, common->rx_bufsize,
-					      GFP_KERNEL);
-			if (skb == NULL) {
-				error = -ENOMEM;
-				goto err;
-			}
-
-			bf->bf_mpdu = skb;
-			bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
-					common->rx_bufsize,
-					DMA_FROM_DEVICE);
-			if (unlikely(dma_mapping_error(sc->dev,
-							bf->bf_buf_addr))) {
-				dev_kfree_skb_any(skb);
-				bf->bf_mpdu = NULL;
-				bf->bf_buf_addr = 0;
-				ath_print(common, ATH_DBG_FATAL,
-					  "dma_mapping_error() on RX init\n");
-				error = -ENOMEM;
-				goto err;
-			}
+		bf->bf_mpdu = skb;
+		bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
+						 common->rx_bufsize,
+						 DMA_FROM_DEVICE);
+		if (unlikely(dma_mapping_error(sc->dev,
+					       bf->bf_buf_addr))) {
+			dev_kfree_skb_any(skb);
+			bf->bf_mpdu = NULL;
+			bf->bf_buf_addr = 0;
+			ath_err(common,
+				"dma_mapping_error() on RX init\n");
+			error = -ENOMEM;
+			goto err;
 		}
-		sc->rx.rxlink = NULL;
 	}
-
+	sc->rx.rxlink = NULL;
 err:
 	if (error)
 		ath_rx_cleanup(sc);
@@ -379,26 +333,23 @@ void ath_rx_cleanup(struct ath_softc *sc)
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct sk_buff *skb;
-	struct ath_buf *bf;
+	struct ath_rxbuf *bf;
 
 	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
 		ath_rx_edma_cleanup(sc);
 		return;
-	} else {
-		list_for_each_entry(bf, &sc->rx.rxbuf, list) {
-			skb = bf->bf_mpdu;
-			if (skb) {
-				dma_unmap_single(sc->dev, bf->bf_buf_addr,
-						common->rx_bufsize,
-						DMA_FROM_DEVICE);
-				dev_kfree_skb(skb);
-				bf->bf_buf_addr = 0;
-				bf->bf_mpdu = NULL;
-			}
-		}
+	}
 
-		if (sc->rx.rxdma.dd_desc_len != 0)
-			ath_descdma_cleanup(sc, &sc->rx.rxdma, &sc->rx.rxbuf);
+	list_for_each_entry(bf, &sc->rx.rxbuf, list) {
+		skb = bf->bf_mpdu;
+		if (skb) {
+			dma_unmap_single(sc->dev, bf->bf_buf_addr,
+					 common->rx_bufsize,
+					 DMA_FROM_DEVICE);
+			dev_kfree_skb(skb);
+			bf->bf_buf_addr = 0;
+			bf->bf_mpdu = NULL;
+		}
 	}
 }
 
@@ -423,14 +374,18 @@ void ath_rx_cleanup(struct ath_softc *sc)
 
 u32 ath_calcrxfilter(struct ath_softc *sc)
 {
-#define	RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
-
 	u32 rfilt;
 
-	rfilt = (ath9k_hw_getrxfilter(sc->sc_ah) & RX_FILTER_PRESERVE)
-		| ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
+	if (config_enabled(CONFIG_ATH9K_TX99))
+		return 0;
+
+	rfilt = ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
 		| ATH9K_RX_FILTER_MCAST;
 
+	/* if operating on a DFS channel, enable radar pulse detection */
+	if (sc->hw->conf.radar_enabled)
+		rfilt |= ATH9K_RX_FILTER_PHYRADAR | ATH9K_RX_FILTER_PHYERR;
+
 	if (sc->rx.rxfilter & FIF_PROBE_REQ)
 		rfilt |= ATH9K_RX_FILTER_PROBEREQ;
 
@@ -439,9 +394,7 @@ u32 ath_calcrxfilter(struct ath_softc *sc)
 	 * mode interface or when in monitor mode. AP mode does not need this
 	 * since it receives all in-BSS frames anyway.
 	 */
-	if (((sc->sc_ah->opmode != NL80211_IFTYPE_AP) &&
-	     (sc->rx.rxfilter & FIF_PROMISC_IN_BSS)) ||
-	    (sc->sc_ah->is_monitoring))
+	if (sc->sc_ah->is_monitoring)
 		rfilt |= ATH9K_RX_FILTER_PROM;
 
 	if (sc->rx.rxfilter & FIF_CONTROL)
@@ -454,92 +407,92 @@ u32 ath_calcrxfilter(struct ath_softc *sc)
 	else
 		rfilt |= ATH9K_RX_FILTER_BEACON;
 
-	if ((AR_SREV_9280_20_OR_LATER(sc->sc_ah) ||
-	    AR_SREV_9285_12_OR_LATER(sc->sc_ah)) &&
-	    (sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
+	if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) ||
 	    (sc->rx.rxfilter & FIF_PSPOLL))
 		rfilt |= ATH9K_RX_FILTER_PSPOLL;
 
 	if (conf_is_ht(&sc->hw->conf))
 		rfilt |= ATH9K_RX_FILTER_COMP_BAR;
 
-	if (sc->sec_wiphy || (sc->nvifs > 1) ||
-	    (sc->rx.rxfilter & FIF_OTHER_BSS)) {
-		/* The following may also be needed for other older chips */
-		if (sc->sc_ah->hw_version.macVersion == AR_SREV_VERSION_9160)
+	if (sc->nvifs > 1 || (sc->rx.rxfilter & FIF_OTHER_BSS)) {
+		/* This is needed for older chips */
+		if (sc->sc_ah->hw_version.macVersion <= AR_SREV_VERSION_9160)
 			rfilt |= ATH9K_RX_FILTER_PROM;
 		rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
 	}
 
+	if (AR_SREV_9550(sc->sc_ah) || AR_SREV_9531(sc->sc_ah))
+		rfilt |= ATH9K_RX_FILTER_4ADDRESS;
+
 	return rfilt;
 
-#undef RX_FILTER_PRESERVE
 }
 
 int ath_startrecv(struct ath_softc *sc)
 {
 	struct ath_hw *ah = sc->sc_ah;
-	struct ath_buf *bf, *tbf;
+	struct ath_rxbuf *bf, *tbf;
 
 	if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
 		ath_edma_start_recv(sc);
 		return 0;
 	}
 
-	spin_lock_bh(&sc->rx.rxbuflock);
 	if (list_empty(&sc->rx.rxbuf))
 		goto start_recv;
 
+	sc->rx.buf_hold = NULL;
 	sc->rx.rxlink = NULL;
 	list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
-		ath_rx_buf_link(sc, bf);
+		ath_rx_buf_link(sc, bf, false);
 	}
 
 	/* We could have deleted elements so the list may be empty now */
 	if (list_empty(&sc->rx.rxbuf))
 		goto start_recv;
 
-	bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
+	bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list);
 	ath9k_hw_putrxbuf(ah, bf->bf_daddr);
 	ath9k_hw_rxena(ah);
 
 start_recv:
 	ath_opmode_init(sc);
-	ath9k_hw_startpcureceive(ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
-
-	spin_unlock_bh(&sc->rx.rxbuflock);
+	ath9k_hw_startpcureceive(ah, !!(sc->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL));
 
 	return 0;
 }
 
+static void ath_flushrecv(struct ath_softc *sc)
+{
+	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
+		ath_rx_tasklet(sc, 1, true);
+	ath_rx_tasklet(sc, 1, false);
+}
+
 bool ath_stoprecv(struct ath_softc *sc)
 {
 	struct ath_hw *ah = sc->sc_ah;
-	bool stopped;
+	bool stopped, reset = false;
 
-	spin_lock_bh(&sc->rx.rxbuflock);
 	ath9k_hw_abortpcurecv(ah);
 	ath9k_hw_setrxfilter(ah, 0);
-	stopped = ath9k_hw_stopdmarecv(ah);
+	stopped = ath9k_hw_stopdmarecv(ah, &reset);
+
+	ath_flushrecv(sc);
 
 	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
 		ath_edma_stop_recv(sc);
 	else
 		sc->rx.rxlink = NULL;
-	spin_unlock_bh(&sc->rx.rxbuflock);
 
-	ATH_DBG_WARN(!stopped, "Could not stop RX, we could be "
-		     "confusing the DMA engine when we start RX up\n");
-	return stopped;
-}
-
-void ath_flushrecv(struct ath_softc *sc)
-{
-	sc->sc_flags |= SC_OP_RXFLUSH;
-	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
-		ath_rx_tasklet(sc, 1, true);
-	ath_rx_tasklet(sc, 1, false);
-	sc->sc_flags &= ~SC_OP_RXFLUSH;
+	if (!(ah->ah_flags & AH_UNPLUGGED) &&
+	    unlikely(!stopped)) {
+		ath_err(ath9k_hw_common(sc->sc_ah),
+			"Could not stop RX, we could be "
+			"confusing the DMA engine when we start RX up\n");
+		ATH_DBG_WARN_ON_ONCE(!stopped);
+	}
+	return stopped && !reset;
 }
 
 static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
@@ -576,24 +529,21 @@ static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
 
 static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
 {
-	struct ieee80211_mgmt *mgmt;
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 
 	if (skb->len < 24 + 8 + 2 + 2)
 		return;
 
-	mgmt = (struct ieee80211_mgmt *)skb->data;
-	if (memcmp(common->curbssid, mgmt->bssid, ETH_ALEN) != 0)
-		return; /* not from our current AP */
-
 	sc->ps_flags &= ~PS_WAIT_FOR_BEACON;
 
 	if (sc->ps_flags & PS_BEACON_SYNC) {
 		sc->ps_flags &= ~PS_BEACON_SYNC;
-		ath_print(common, ATH_DBG_PS,
-			  "Reconfigure Beacon timers based on "
-			  "timestamp from the AP\n");
-		ath_beacon_config(sc, NULL);
+		ath_dbg(common, PS,
+			"Reconfigure beacon timers based on synchronized timestamp\n");
+		if (!(WARN_ON_ONCE(sc->cur_beacon_conf.beacon_interval == 0)))
+			ath9k_set_beacon(sc);
+		if (sc->p2p_ps_vif)
+			ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif);
 	}
 
 	if (ath_beacon_dtim_pending_cab(skb)) {
@@ -604,8 +554,8 @@ static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
 		 * a backup trigger for returning into NETWORK SLEEP state,
 		 * so we are waiting for it as well.
 		 */
-		ath_print(common, ATH_DBG_PS, "Received DTIM beacon indicating "
-			  "buffered broadcast/multicast frame(s)\n");
+		ath_dbg(common, PS,
+			"Received DTIM beacon indicating buffered broadcast/multicast frame(s)\n");
 		sc->ps_flags |= PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON;
 		return;
 	}
@@ -617,12 +567,11 @@ static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
 		 * been delivered.
 		 */
 		sc->ps_flags &= ~PS_WAIT_FOR_CAB;
-		ath_print(common, ATH_DBG_PS,
-			  "PS wait for CAB frames timed out\n");
+		ath_dbg(common, PS, "PS wait for CAB frames timed out\n");
 	}
 }
 
-static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb)
+static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb, bool mybeacon)
 {
 	struct ieee80211_hdr *hdr;
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
@@ -631,27 +580,26 @@ static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb)
 
 	/* Process Beacon and CAB receive in PS state */
 	if (((sc->ps_flags & PS_WAIT_FOR_BEACON) || ath9k_check_auto_sleep(sc))
-	    && ieee80211_is_beacon(hdr->frame_control))
+	    && mybeacon) {
 		ath_rx_ps_beacon(sc, skb);
-	else if ((sc->ps_flags & PS_WAIT_FOR_CAB) &&
-		 (ieee80211_is_data(hdr->frame_control) ||
-		  ieee80211_is_action(hdr->frame_control)) &&
-		 is_multicast_ether_addr(hdr->addr1) &&
-		 !ieee80211_has_moredata(hdr->frame_control)) {
+	} else if ((sc->ps_flags & PS_WAIT_FOR_CAB) &&
+		   (ieee80211_is_data(hdr->frame_control) ||
+		    ieee80211_is_action(hdr->frame_control)) &&
+		   is_multicast_ether_addr(hdr->addr1) &&
+		   !ieee80211_has_moredata(hdr->frame_control)) {
 		/*
 		 * No more broadcast/multicast frames to be received at this
 		 * point.
 		 */
 		sc->ps_flags &= ~(PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON);
-		ath_print(common, ATH_DBG_PS,
-			  "All PS CAB frames received, back to sleep\n");
+		ath_dbg(common, PS,
+			"All PS CAB frames received, back to sleep\n");
 	} else if ((sc->ps_flags & PS_WAIT_FOR_PSPOLL_DATA) &&
 		   !is_multicast_ether_addr(hdr->addr1) &&
 		   !ieee80211_has_morefrags(hdr->frame_control)) {
 		sc->ps_flags &= ~PS_WAIT_FOR_PSPOLL_DATA;
-		ath_print(common, ATH_DBG_PS,
-			  "Going back to sleep after having received "
-			  "PS-Poll data (0x%lx)\n",
+		ath_dbg(common, PS,
+			"Going back to sleep after having received PS-Poll data (0x%lx)\n",
 			sc->ps_flags & (PS_WAIT_FOR_BEACON |
 					PS_WAIT_FOR_CAB |
 					PS_WAIT_FOR_PSPOLL_DATA |
@@ -659,46 +607,16 @@ static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb)
 	}
 }
 
-static void ath_rx_send_to_mac80211(struct ieee80211_hw *hw,
-				    struct ath_softc *sc, struct sk_buff *skb,
-				    struct ieee80211_rx_status *rxs)
-{
-	struct ieee80211_hdr *hdr;
-
-	hdr = (struct ieee80211_hdr *)skb->data;
-
-	/* Send the frame to mac80211 */
-	if (is_multicast_ether_addr(hdr->addr1)) {
-		int i;
-		/*
-		 * Deliver broadcast/multicast frames to all suitable
-		 * virtual wiphys.
-		 */
-		/* TODO: filter based on channel configuration */
-		for (i = 0; i < sc->num_sec_wiphy; i++) {
-			struct ath_wiphy *aphy = sc->sec_wiphy[i];
-			struct sk_buff *nskb;
-			if (aphy == NULL)
-				continue;
-			nskb = skb_copy(skb, GFP_ATOMIC);
-			if (!nskb)
-				continue;
-			ieee80211_rx(aphy->hw, nskb);
-		}
-		ieee80211_rx(sc->hw, skb);
-	} else
-		/* Deliver unicast frames based on receiver address */
-		ieee80211_rx(hw, skb);
-}
-
 static bool ath_edma_get_buffers(struct ath_softc *sc,
-				 enum ath9k_rx_qtype qtype)
+				 enum ath9k_rx_qtype qtype,
+				 struct ath_rx_status *rs,
+				 struct ath_rxbuf **dest)
 {
 	struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct sk_buff *skb;
-	struct ath_buf *bf;
+	struct ath_rxbuf *bf;
 	int ret;
 
 	skb = skb_peek(&rx_edma->rx_fifo);
@@ -711,7 +629,7 @@ static bool ath_edma_get_buffers(struct ath_softc *sc,
 	dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
 				common->rx_bufsize, DMA_FROM_DEVICE);
 
-	ret = ath9k_hw_process_rxdesc_edma(ah, NULL, skb->data);
+	ret = ath9k_hw_process_rxdesc_edma(ah, rs, skb->data);
 	if (ret == -EINPROGRESS) {
 		/*let device gain the buffer again*/
 		dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
@@ -724,48 +642,46 @@ static bool ath_edma_get_buffers(struct ath_softc *sc,
 		/* corrupt descriptor, skip this one and the following one */
 		list_add_tail(&bf->list, &sc->rx.rxbuf);
 		ath_rx_edma_buf_link(sc, qtype);
+
 		skb = skb_peek(&rx_edma->rx_fifo);
-		if (!skb)
-			return true;
+		if (skb) {
+			bf = SKB_CB_ATHBUF(skb);
+			BUG_ON(!bf);
 
-		bf = SKB_CB_ATHBUF(skb);
-		BUG_ON(!bf);
+			__skb_unlink(skb, &rx_edma->rx_fifo);
+			list_add_tail(&bf->list, &sc->rx.rxbuf);
+			ath_rx_edma_buf_link(sc, qtype);
+		}
 
-		__skb_unlink(skb, &rx_edma->rx_fifo);
-		list_add_tail(&bf->list, &sc->rx.rxbuf);
-		ath_rx_edma_buf_link(sc, qtype);
-		return true;
+		bf = NULL;
 	}
-	skb_queue_tail(&rx_edma->rx_buffers, skb);
 
+	*dest = bf;
 	return true;
 }
 
-static struct ath_buf *ath_edma_get_next_rx_buf(struct ath_softc *sc,
+static struct ath_rxbuf *ath_edma_get_next_rx_buf(struct ath_softc *sc,
 						struct ath_rx_status *rs,
 						enum ath9k_rx_qtype qtype)
 {
-	struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
-	struct sk_buff *skb;
-	struct ath_buf *bf;
+	struct ath_rxbuf *bf = NULL;
 
-	while (ath_edma_get_buffers(sc, qtype));
-	skb = __skb_dequeue(&rx_edma->rx_buffers);
-	if (!skb)
-		return NULL;
+	while (ath_edma_get_buffers(sc, qtype, rs, &bf)) {
+		if (!bf)
+			continue;
 
-	bf = SKB_CB_ATHBUF(skb);
-	ath9k_hw_process_rxdesc_edma(sc->sc_ah, rs, skb->data);
-	return bf;
+		return bf;
+	}
+	return NULL;
 }
 
-static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
+static struct ath_rxbuf *ath_get_next_rx_buf(struct ath_softc *sc,
 					   struct ath_rx_status *rs)
 {
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath_desc *ds;
-	struct ath_buf *bf;
+	struct ath_rxbuf *bf;
 	int ret;
 
 	if (list_empty(&sc->rx.rxbuf)) {
@@ -773,7 +689,10 @@ static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
 		return NULL;
 	}
 
-	bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
+	bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list);
+	if (bf == sc->rx.buf_hold)
+		return NULL;
+
 	ds = bf->bf_desc;
 
 	/*
@@ -787,10 +706,10 @@ static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
 	 * on.  All this is necessary because of our use of
 	 * a self-linked list to avoid rx overruns.
 	 */
-	ret = ath9k_hw_rxprocdesc(ah, ds, rs, 0);
+	ret = ath9k_hw_rxprocdesc(ah, ds, rs);
 	if (ret == -EINPROGRESS) {
 		struct ath_rx_status trs;
-		struct ath_buf *tbf;
+		struct ath_rxbuf *tbf;
 		struct ath_desc *tds;
 
 		memset(&trs, 0, sizeof(trs));
@@ -799,7 +718,7 @@ static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
 			return NULL;
 		}
 
-		tbf = list_entry(bf->list.next, struct ath_buf, list);
+		tbf = list_entry(bf->list.next, struct ath_rxbuf, list);
 
 		/*
 		 * On some hardware the descriptor status words could
@@ -813,11 +732,26 @@ static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
 		 */
 
 		tds = tbf->bf_desc;
-		ret = ath9k_hw_rxprocdesc(ah, tds, &trs, 0);
+		ret = ath9k_hw_rxprocdesc(ah, tds, &trs);
 		if (ret == -EINPROGRESS)
 			return NULL;
+
+		/*
+		 * Re-check previous descriptor, in case it has been filled
+		 * in the mean time.
+		 */
+		ret = ath9k_hw_rxprocdesc(ah, ds, rs);
+		if (ret == -EINPROGRESS) {
+			/*
+			 * mark descriptor as zero-length and set the 'more'
+			 * flag to ensure that both buffers get discarded
+			 */
+			rs->rs_datalen = 0;
+			rs->rs_more = true;
+		}
 	}
 
+	list_del(&bf->list);
 	if (!bf->bf_mpdu)
 		return bf;
 
@@ -833,807 +767,220 @@ static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
 	return bf;
 }
 
-/* Assumes you've already done the endian to CPU conversion */
-static bool ath9k_rx_accept(struct ath_common *common,
-			    struct ieee80211_hdr *hdr,
-			    struct ieee80211_rx_status *rxs,
-			    struct ath_rx_status *rx_stats,
-			    bool *decrypt_error)
+static void ath9k_process_tsf(struct ath_rx_status *rs,
+			      struct ieee80211_rx_status *rxs,
+			      u64 tsf)
 {
-	struct ath_hw *ah = common->ah;
-	__le16 fc;
-	u8 rx_status_len = ah->caps.rx_status_len;
+	u32 tsf_lower = tsf & 0xffffffff;
 
-	fc = hdr->frame_control;
+	rxs->mactime = (tsf & ~0xffffffffULL) | rs->rs_tstamp;
+	if (rs->rs_tstamp > tsf_lower &&
+	    unlikely(rs->rs_tstamp - tsf_lower > 0x10000000))
+		rxs->mactime -= 0x100000000ULL;
 
-	if (!rx_stats->rs_datalen)
-		return false;
-        /*
-         * rs_status follows rs_datalen so if rs_datalen is too large
-         * we can take a hint that hardware corrupted it, so ignore
-         * those frames.
-         */
-	if (rx_stats->rs_datalen > (common->rx_bufsize - rx_status_len))
-		return false;
+	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
+ * decryption key or real decryption error. This let us keep statistics there.
+ */
+static int ath9k_rx_skb_preprocess(struct ath_softc *sc,
+				   struct sk_buff *skb,
+				   struct ath_rx_status *rx_stats,
+				   struct ieee80211_rx_status *rx_status,
+				   bool *decrypt_error, u64 tsf)
+{
+	struct ieee80211_hw *hw = sc->hw;
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ieee80211_hdr *hdr;
+	bool discard_current = sc->rx.discard_next;
 
 	/*
-	 * rs_more indicates chained descriptors which can be used
-	 * to link buffers together for a sort of scatter-gather
-	 * operation.
-	 * reject the frame, we don't support scatter-gather yet and
-	 * the frame is probably corrupt anyway
+	 * Discard corrupt descriptors which are marked in
+	 * ath_get_next_rx_buf().
 	 */
-	if (rx_stats->rs_more)
-		return false;
+	if (discard_current)
+		goto corrupt;
+
+	sc->rx.discard_next = false;
 
 	/*
-	 * The rx_stats->rs_status will not be set until the end of the
-	 * chained descriptors so it can be ignored if rs_more is set. The
-	 * rs_more will be false at the last element of the chained
-	 * descriptors.
+	 * Discard zero-length packets.
 	 */
-	if (rx_stats->rs_status != 0) {
-		if (rx_stats->rs_status & ATH9K_RXERR_CRC)
-			rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
-		if (rx_stats->rs_status & ATH9K_RXERR_PHY)
-			return false;
-
-		if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
-			*decrypt_error = true;
-		} else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
-			/*
-			 * The MIC error bit is only valid if the frame
-			 * is not a control frame or fragment, and it was
-			 * decrypted using a valid TKIP key.
-			 */
-			if (!ieee80211_is_ctl(fc) &&
-			    !ieee80211_has_morefrags(fc) &&
-			    !(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
-			    test_bit(rx_stats->rs_keyix, common->tkip_keymap))
-				rxs->flag |= RX_FLAG_MMIC_ERROR;
-			else
-				rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
-		}
-		/*
-		 * Reject error frames with the exception of
-		 * decryption and MIC failures. For monitor mode,
-		 * we also ignore the CRC error.
-		 */
-		if (ah->is_monitoring) {
-			if (rx_stats->rs_status &
-			    ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
-			      ATH9K_RXERR_CRC))
-				return false;
-		} else {
-			if (rx_stats->rs_status &
-			    ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
-				return false;
-			}
-		}
+	if (!rx_stats->rs_datalen) {
+		RX_STAT_INC(rx_len_err);
+		goto corrupt;
 	}
-	return true;
-}
 
-static int ath9k_process_rate(struct ath_common *common,
-			      struct ieee80211_hw *hw,
-			      struct ath_rx_status *rx_stats,
-			      struct ieee80211_rx_status *rxs)
-{
-	struct ieee80211_supported_band *sband;
-	enum ieee80211_band band;
-	unsigned int i = 0;
-
-	band = hw->conf.channel->band;
-	sband = hw->wiphy->bands[band];
-
-	if (rx_stats->rs_rate & 0x80) {
-		/* HT rate */
-		rxs->flag |= RX_FLAG_HT;
-		if (rx_stats->rs_flags & ATH9K_RX_2040)
-			rxs->flag |= RX_FLAG_40MHZ;
-		if (rx_stats->rs_flags & ATH9K_RX_GI)
-			rxs->flag |= RX_FLAG_SHORT_GI;
-		rxs->rate_idx = rx_stats->rs_rate & 0x7f;
-		return 0;
+	/*
+	 * rs_status follows rs_datalen so if rs_datalen is too large
+	 * we can take a hint that hardware corrupted it, so ignore
+	 * those frames.
+	 */
+	if (rx_stats->rs_datalen > (common->rx_bufsize - ah->caps.rx_status_len)) {
+		RX_STAT_INC(rx_len_err);
+		goto corrupt;
 	}
 
-	for (i = 0; i < sband->n_bitrates; i++) {
-		if (sband->bitrates[i].hw_value == rx_stats->rs_rate) {
-			rxs->rate_idx = i;
-			return 0;
-		}
-		if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
-			rxs->flag |= RX_FLAG_SHORTPRE;
-			rxs->rate_idx = i;
-			return 0;
-		}
-	}
+	/* Only use status info from the last fragment */
+	if (rx_stats->rs_more)
+		return 0;
 
 	/*
-	 * No valid hardware bitrate found -- we should not get here
-	 * because hardware has already validated this frame as OK.
+	 * Return immediately if the RX descriptor has been marked
+	 * as corrupt based on the various error bits.
+	 *
+	 * This is different from the other corrupt descriptor
+	 * condition handled above.
 	 */
-	ath_print(common, ATH_DBG_XMIT, "unsupported hw bitrate detected "
-		  "0x%02x using 1 Mbit\n", rx_stats->rs_rate);
-
-	return -EINVAL;
-}
+	if (rx_stats->rs_status & ATH9K_RXERR_CORRUPT_DESC)
+		goto corrupt;
 
-static void ath9k_process_rssi(struct ath_common *common,
-			       struct ieee80211_hw *hw,
-			       struct ieee80211_hdr *hdr,
-			       struct ath_rx_status *rx_stats)
-{
-	struct ath_wiphy *aphy = hw->priv;
-	struct ath_hw *ah = common->ah;
-	int last_rssi;
-	__le16 fc;
+	hdr = (struct ieee80211_hdr *) (skb->data + ah->caps.rx_status_len);
 
-	if (ah->opmode != NL80211_IFTYPE_STATION)
-		return;
+	ath9k_process_tsf(rx_stats, rx_status, tsf);
+	ath_debug_stat_rx(sc, rx_stats);
 
-	fc = hdr->frame_control;
-	if (!ieee80211_is_beacon(fc) ||
-	    compare_ether_addr(hdr->addr3, common->curbssid))
-		return;
-
-	if (rx_stats->rs_rssi != ATH9K_RSSI_BAD && !rx_stats->rs_moreaggr)
-		ATH_RSSI_LPF(aphy->last_rssi, rx_stats->rs_rssi);
-
-	last_rssi = aphy->last_rssi;
-	if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
-		rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
-					      ATH_RSSI_EP_MULTIPLIER);
-	if (rx_stats->rs_rssi < 0)
-		rx_stats->rs_rssi = 0;
-
-	/* Update Beacon RSSI, this is used by ANI. */
-	ah->stats.avgbrssi = rx_stats->rs_rssi;
-}
+	/*
+	 * Process PHY errors and return so that the packet
+	 * can be dropped.
+	 */
+	if (rx_stats->rs_status & ATH9K_RXERR_PHY) {
+		ath9k_dfs_process_phyerr(sc, hdr, rx_stats, rx_status->mactime);
+		if (ath_process_fft(sc, hdr, rx_stats, rx_status->mactime))
+			RX_STAT_INC(rx_spectral);
 
-/*
- * 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
- * decryption key or real decryption error. This let us keep statistics there.
- */
-static int ath9k_rx_skb_preprocess(struct ath_common *common,
-				   struct ieee80211_hw *hw,
-				   struct ieee80211_hdr *hdr,
-				   struct ath_rx_status *rx_stats,
-				   struct ieee80211_rx_status *rx_status,
-				   bool *decrypt_error)
-{
-	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
+		return -EINVAL;
+	}
 
 	/*
 	 * everything but the rate is checked here, the rate check is done
 	 * separately to avoid doing two lookups for a rate for each frame.
 	 */
-	if (!ath9k_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error))
+	if (!ath9k_cmn_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error, sc->rx.rxfilter))
 		return -EINVAL;
 
-	ath9k_process_rssi(common, hw, hdr, rx_stats);
+	if (ath_is_mybeacon(common, hdr)) {
+		RX_STAT_INC(rx_beacons);
+		rx_stats->is_mybeacon = true;
+	}
 
-	if (ath9k_process_rate(common, hw, rx_stats, rx_status))
+	/*
+	 * This shouldn't happen, but have a safety check anyway.
+	 */
+	if (WARN_ON(!ah->curchan))
 		return -EINVAL;
 
-	rx_status->band = hw->conf.channel->band;
-	rx_status->freq = hw->conf.channel->center_freq;
-	rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
-	rx_status->antenna = rx_stats->rs_antenna;
-	rx_status->flag |= RX_FLAG_TSFT;
-
-	return 0;
-}
-
-static void ath9k_rx_skb_postprocess(struct ath_common *common,
-				     struct sk_buff *skb,
-				     struct ath_rx_status *rx_stats,
-				     struct ieee80211_rx_status *rxs,
-				     bool decrypt_error)
-{
-	struct ath_hw *ah = common->ah;
-	struct ieee80211_hdr *hdr;
-	int hdrlen, padpos, padsize;
-	u8 keyix;
-	__le16 fc;
-
-	/* see if any padding is done by the hw and remove it */
-	hdr = (struct ieee80211_hdr *) skb->data;
-	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
-	fc = hdr->frame_control;
-	padpos = ath9k_cmn_padpos(hdr->frame_control);
-
-	/* The MAC header is padded to have 32-bit boundary if the
-	 * packet payload is non-zero. The general calculation for
-	 * padsize would take into account odd header lengths:
-	 * padsize = (4 - padpos % 4) % 4; However, since only
-	 * even-length headers are used, padding can only be 0 or 2
-	 * bytes and we can optimize this a bit. In addition, we must
-	 * not try to remove padding from short control frames that do
-	 * not have payload. */
-	padsize = padpos & 3;
-	if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
-		memmove(skb->data + padsize, skb->data, padpos);
-		skb_pull(skb, padsize);
+	if (ath9k_cmn_process_rate(common, hw, rx_stats, rx_status)) {
+		/*
+		 * No valid hardware bitrate found -- we should not get here
+		 * because hardware has already validated this frame as OK.
+		 */
+		ath_dbg(common, ANY, "unsupported hw bitrate detected 0x%02x using 1 Mbit\n",
+			rx_stats->rs_rate);
+		RX_STAT_INC(rx_rate_err);
+		return -EINVAL;
 	}
 
-	keyix = rx_stats->rs_keyix;
+	ath9k_cmn_process_rssi(common, hw, rx_stats, rx_status);
+
+	rx_status->band = ah->curchan->chan->band;
+	rx_status->freq = ah->curchan->chan->center_freq;
+	rx_status->antenna = rx_stats->rs_antenna;
+	rx_status->flag |= RX_FLAG_MACTIME_END;
 
-	if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
-	    ieee80211_has_protected(fc)) {
-		rxs->flag |= RX_FLAG_DECRYPTED;
-	} else if (ieee80211_has_protected(fc)
-		   && !decrypt_error && skb->len >= hdrlen + 4) {
-		keyix = skb->data[hdrlen + 3] >> 6;
+#ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
+	if (ieee80211_is_data_present(hdr->frame_control) &&
+	    !ieee80211_is_qos_nullfunc(hdr->frame_control))
+		sc->rx.num_pkts++;
+#endif
 
-		if (test_bit(keyix, common->keymap))
-			rxs->flag |= RX_FLAG_DECRYPTED;
-	}
-	if (ah->sw_mgmt_crypto &&
-	    (rxs->flag & RX_FLAG_DECRYPTED) &&
-	    ieee80211_is_mgmt(fc))
-		/* Use software decrypt for management frames. */
-		rxs->flag &= ~RX_FLAG_DECRYPTED;
-}
+	return 0;
 
-static void ath_lnaconf_alt_good_scan(struct ath_ant_comb *antcomb,
-				      struct ath_hw_antcomb_conf ant_conf,
-				      int main_rssi_avg)
-{
-	antcomb->quick_scan_cnt = 0;
-
-	if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA2)
-		antcomb->rssi_lna2 = main_rssi_avg;
-	else if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA1)
-		antcomb->rssi_lna1 = main_rssi_avg;
-
-	switch ((ant_conf.main_lna_conf << 4) | ant_conf.alt_lna_conf) {
-	case (0x10): /* LNA2 A-B */
-		antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-		antcomb->first_quick_scan_conf =
-			ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-		antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1;
-		break;
-	case (0x20): /* LNA1 A-B */
-		antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-		antcomb->first_quick_scan_conf =
-			ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-		antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2;
-		break;
-	case (0x21): /* LNA1 LNA2 */
-		antcomb->main_conf = ATH_ANT_DIV_COMB_LNA2;
-		antcomb->first_quick_scan_conf =
-			ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-		antcomb->second_quick_scan_conf =
-			ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-		break;
-	case (0x12): /* LNA2 LNA1 */
-		antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1;
-		antcomb->first_quick_scan_conf =
-			ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-		antcomb->second_quick_scan_conf =
-			ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-		break;
-	case (0x13): /* LNA2 A+B */
-		antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-		antcomb->first_quick_scan_conf =
-			ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-		antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1;
-		break;
-	case (0x23): /* LNA1 A+B */
-		antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-		antcomb->first_quick_scan_conf =
-			ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-		antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2;
-		break;
-	default:
-		break;
-	}
+corrupt:
+	sc->rx.discard_next = rx_stats->rs_more;
+	return -EINVAL;
 }
 
-static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb,
-				struct ath_hw_antcomb_conf *div_ant_conf,
-				int main_rssi_avg, int alt_rssi_avg,
-				int alt_ratio)
+/*
+ * Run the LNA combining algorithm only in these cases:
+ *
+ * Standalone WLAN cards with both LNA/Antenna diversity
+ * enabled in the EEPROM.
+ *
+ * WLAN+BT cards which are in the supported card list
+ * in ath_pci_id_table and the user has loaded the
+ * driver with "bt_ant_diversity" set to true.
+ */
+static void ath9k_antenna_check(struct ath_softc *sc,
+				struct ath_rx_status *rs)
 {
-	/* alt_good */
-	switch (antcomb->quick_scan_cnt) {
-	case 0:
-		/* set alt to main, and alt to first conf */
-		div_ant_conf->main_lna_conf = antcomb->main_conf;
-		div_ant_conf->alt_lna_conf = antcomb->first_quick_scan_conf;
-		break;
-	case 1:
-		/* set alt to main, and alt to first conf */
-		div_ant_conf->main_lna_conf = antcomb->main_conf;
-		div_ant_conf->alt_lna_conf = antcomb->second_quick_scan_conf;
-		antcomb->rssi_first = main_rssi_avg;
-		antcomb->rssi_second = alt_rssi_avg;
-
-		if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) {
-			/* main is LNA1 */
-			if (ath_is_alt_ant_ratio_better(alt_ratio,
-						ATH_ANT_DIV_COMB_LNA1_DELTA_HI,
-						ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
-						main_rssi_avg, alt_rssi_avg,
-						antcomb->total_pkt_count))
-				antcomb->first_ratio = true;
-			else
-				antcomb->first_ratio = false;
-		} else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) {
-			if (ath_is_alt_ant_ratio_better(alt_ratio,
-						ATH_ANT_DIV_COMB_LNA1_DELTA_MID,
-						ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
-						main_rssi_avg, alt_rssi_avg,
-						antcomb->total_pkt_count))
-				antcomb->first_ratio = true;
-			else
-				antcomb->first_ratio = false;
-		} else {
-			if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
-			    (alt_rssi_avg > main_rssi_avg +
-			    ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
-			    (alt_rssi_avg > main_rssi_avg)) &&
-			    (antcomb->total_pkt_count > 50))
-				antcomb->first_ratio = true;
-			else
-				antcomb->first_ratio = false;
-		}
-		break;
-	case 2:
-		antcomb->alt_good = false;
-		antcomb->scan_not_start = false;
-		antcomb->scan = false;
-		antcomb->rssi_first = main_rssi_avg;
-		antcomb->rssi_third = alt_rssi_avg;
-
-		if (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1)
-			antcomb->rssi_lna1 = alt_rssi_avg;
-		else if (antcomb->second_quick_scan_conf ==
-			 ATH_ANT_DIV_COMB_LNA2)
-			antcomb->rssi_lna2 = alt_rssi_avg;
-		else if (antcomb->second_quick_scan_conf ==
-			 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2) {
-			if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2)
-				antcomb->rssi_lna2 = main_rssi_avg;
-			else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1)
-				antcomb->rssi_lna1 = main_rssi_avg;
-		}
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath9k_hw_capabilities *pCap = &ah->caps;
+	struct ath_common *common = ath9k_hw_common(ah);
 
-		if (antcomb->rssi_lna2 > antcomb->rssi_lna1 +
-		    ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)
-			div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
-		else
-			div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1;
-
-		if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) {
-			if (ath_is_alt_ant_ratio_better(alt_ratio,
-						ATH_ANT_DIV_COMB_LNA1_DELTA_HI,
-						ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
-						main_rssi_avg, alt_rssi_avg,
-						antcomb->total_pkt_count))
-				antcomb->second_ratio = true;
-			else
-				antcomb->second_ratio = false;
-		} else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) {
-			if (ath_is_alt_ant_ratio_better(alt_ratio,
-						ATH_ANT_DIV_COMB_LNA1_DELTA_MID,
-						ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
-						main_rssi_avg, alt_rssi_avg,
-						antcomb->total_pkt_count))
-				antcomb->second_ratio = true;
-			else
-				antcomb->second_ratio = false;
-		} else {
-			if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
-			    (alt_rssi_avg > main_rssi_avg +
-			    ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
-			    (alt_rssi_avg > main_rssi_avg)) &&
-			    (antcomb->total_pkt_count > 50))
-				antcomb->second_ratio = true;
-			else
-				antcomb->second_ratio = false;
-		}
+	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB))
+		return;
 
-		/* set alt to the conf with maximun ratio */
-		if (antcomb->first_ratio && antcomb->second_ratio) {
-			if (antcomb->rssi_second > antcomb->rssi_third) {
-				/* first alt*/
-				if ((antcomb->first_quick_scan_conf ==
-				    ATH_ANT_DIV_COMB_LNA1) ||
-				    (antcomb->first_quick_scan_conf ==
-				    ATH_ANT_DIV_COMB_LNA2))
-					/* Set alt LNA1 or LNA2*/
-					if (div_ant_conf->main_lna_conf ==
-					    ATH_ANT_DIV_COMB_LNA2)
-						div_ant_conf->alt_lna_conf =
-							ATH_ANT_DIV_COMB_LNA1;
-					else
-						div_ant_conf->alt_lna_conf =
-							ATH_ANT_DIV_COMB_LNA2;
-				else
-					/* Set alt to A+B or A-B */
-					div_ant_conf->alt_lna_conf =
-						antcomb->first_quick_scan_conf;
-			} else if ((antcomb->second_quick_scan_conf ==
-				   ATH_ANT_DIV_COMB_LNA1) ||
-				   (antcomb->second_quick_scan_conf ==
-				   ATH_ANT_DIV_COMB_LNA2)) {
-				/* Set alt LNA1 or LNA2 */
-				if (div_ant_conf->main_lna_conf ==
-				    ATH_ANT_DIV_COMB_LNA2)
-					div_ant_conf->alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-				else
-					div_ant_conf->alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-			} else {
-				/* Set alt to A+B or A-B */
-				div_ant_conf->alt_lna_conf =
-					antcomb->second_quick_scan_conf;
-			}
-		} else if (antcomb->first_ratio) {
-			/* first alt */
-			if ((antcomb->first_quick_scan_conf ==
-			    ATH_ANT_DIV_COMB_LNA1) ||
-			    (antcomb->first_quick_scan_conf ==
-			    ATH_ANT_DIV_COMB_LNA2))
-					/* Set alt LNA1 or LNA2 */
-				if (div_ant_conf->main_lna_conf ==
-				    ATH_ANT_DIV_COMB_LNA2)
-					div_ant_conf->alt_lna_conf =
-							ATH_ANT_DIV_COMB_LNA1;
-				else
-					div_ant_conf->alt_lna_conf =
-							ATH_ANT_DIV_COMB_LNA2;
-			else
-				/* Set alt to A+B or A-B */
-				div_ant_conf->alt_lna_conf =
-						antcomb->first_quick_scan_conf;
-		} else if (antcomb->second_ratio) {
-				/* second alt */
-			if ((antcomb->second_quick_scan_conf ==
-			    ATH_ANT_DIV_COMB_LNA1) ||
-			    (antcomb->second_quick_scan_conf ==
-			    ATH_ANT_DIV_COMB_LNA2))
-				/* Set alt LNA1 or LNA2 */
-				if (div_ant_conf->main_lna_conf ==
-				    ATH_ANT_DIV_COMB_LNA2)
-					div_ant_conf->alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-				else
-					div_ant_conf->alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-			else
-				/* Set alt to A+B or A-B */
-				div_ant_conf->alt_lna_conf =
-						antcomb->second_quick_scan_conf;
-		} else {
-			/* main is largest */
-			if ((antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) ||
-			    (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2))
-				/* Set alt LNA1 or LNA2 */
-				if (div_ant_conf->main_lna_conf ==
-				    ATH_ANT_DIV_COMB_LNA2)
-					div_ant_conf->alt_lna_conf =
-							ATH_ANT_DIV_COMB_LNA1;
-				else
-					div_ant_conf->alt_lna_conf =
-							ATH_ANT_DIV_COMB_LNA2;
-			else
-				/* Set alt to A+B or A-B */
-				div_ant_conf->alt_lna_conf = antcomb->main_conf;
-		}
-		break;
-	default:
-		break;
+	/*
+	 * Change the default rx antenna if rx diversity
+	 * chooses the other antenna 3 times in a row.
+	 */
+	if (sc->rx.defant != rs->rs_antenna) {
+		if (++sc->rx.rxotherant >= 3)
+			ath_setdefantenna(sc, rs->rs_antenna);
+	} else {
+		sc->rx.rxotherant = 0;
 	}
-}
 
-static void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf)
-{
-	/* Adjust the fast_div_bias based on main and alt lna conf */
-	switch ((ant_conf->main_lna_conf << 4) | ant_conf->alt_lna_conf) {
-	case (0x01): /* A-B LNA2 */
-		ant_conf->fast_div_bias = 0x3b;
-		break;
-	case (0x02): /* A-B LNA1 */
-		ant_conf->fast_div_bias = 0x3d;
-		break;
-	case (0x03): /* A-B A+B */
-		ant_conf->fast_div_bias = 0x1;
-		break;
-	case (0x10): /* LNA2 A-B */
-		ant_conf->fast_div_bias = 0x7;
-		break;
-	case (0x12): /* LNA2 LNA1 */
-		ant_conf->fast_div_bias = 0x2;
-		break;
-	case (0x13): /* LNA2 A+B */
-		ant_conf->fast_div_bias = 0x7;
-		break;
-	case (0x20): /* LNA1 A-B */
-		ant_conf->fast_div_bias = 0x6;
-		break;
-	case (0x21): /* LNA1 LNA2 */
-		ant_conf->fast_div_bias = 0x0;
-		break;
-	case (0x23): /* LNA1 A+B */
-		ant_conf->fast_div_bias = 0x6;
-		break;
-	case (0x30): /* A+B A-B */
-		ant_conf->fast_div_bias = 0x1;
-		break;
-	case (0x31): /* A+B LNA2 */
-		ant_conf->fast_div_bias = 0x3b;
-		break;
-	case (0x32): /* A+B LNA1 */
-		ant_conf->fast_div_bias = 0x3d;
-		break;
-	default:
-		break;
+	if (pCap->hw_caps & ATH9K_HW_CAP_BT_ANT_DIV) {
+		if (common->bt_ant_diversity)
+			ath_ant_comb_scan(sc, rs);
+	} else {
+		ath_ant_comb_scan(sc, rs);
 	}
 }
 
-/* Antenna diversity and combining */
-static void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs)
+static void ath9k_apply_ampdu_details(struct ath_softc *sc,
+	struct ath_rx_status *rs, struct ieee80211_rx_status *rxs)
 {
-	struct ath_hw_antcomb_conf div_ant_conf;
-	struct ath_ant_comb *antcomb = &sc->ant_comb;
-	int alt_ratio = 0, alt_rssi_avg = 0, main_rssi_avg = 0, curr_alt_set;
-	int curr_main_set, curr_bias;
-	int main_rssi = rs->rs_rssi_ctl0;
-	int alt_rssi = rs->rs_rssi_ctl1;
-	int rx_ant_conf,  main_ant_conf;
-	bool short_scan = false;
-
-	rx_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_CURRENT_SHIFT) &
-		       ATH_ANT_RX_MASK;
-	main_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_MAIN_SHIFT) &
-			 ATH_ANT_RX_MASK;
-
-	/* Record packet only when alt_rssi is positive */
-	if (alt_rssi > 0) {
-		antcomb->total_pkt_count++;
-		antcomb->main_total_rssi += main_rssi;
-		antcomb->alt_total_rssi  += alt_rssi;
-		if (main_ant_conf == rx_ant_conf)
-			antcomb->main_recv_cnt++;
-		else
-			antcomb->alt_recv_cnt++;
-	}
-
-	/* Short scan check */
-	if (antcomb->scan && antcomb->alt_good) {
-		if (time_after(jiffies, antcomb->scan_start_time +
-		    msecs_to_jiffies(ATH_ANT_DIV_COMB_SHORT_SCAN_INTR)))
-			short_scan = true;
-		else
-			if (antcomb->total_pkt_count ==
-			    ATH_ANT_DIV_COMB_SHORT_SCAN_PKTCOUNT) {
-				alt_ratio = ((antcomb->alt_recv_cnt * 100) /
-					    antcomb->total_pkt_count);
-				if (alt_ratio < ATH_ANT_DIV_COMB_ALT_ANT_RATIO)
-					short_scan = true;
-			}
-	}
-
-	if (((antcomb->total_pkt_count < ATH_ANT_DIV_COMB_MAX_PKTCOUNT) ||
-	    rs->rs_moreaggr) && !short_scan)
-		return;
-
-	if (antcomb->total_pkt_count) {
-		alt_ratio = ((antcomb->alt_recv_cnt * 100) /
-			     antcomb->total_pkt_count);
-		main_rssi_avg = (antcomb->main_total_rssi /
-				 antcomb->total_pkt_count);
-		alt_rssi_avg = (antcomb->alt_total_rssi /
-				 antcomb->total_pkt_count);
-	}
+	if (rs->rs_isaggr) {
+		rxs->flag |= RX_FLAG_AMPDU_DETAILS | RX_FLAG_AMPDU_LAST_KNOWN;
 
+		rxs->ampdu_reference = sc->rx.ampdu_ref;
 
-	ath9k_hw_antdiv_comb_conf_get(sc->sc_ah, &div_ant_conf);
-	curr_alt_set = div_ant_conf.alt_lna_conf;
-	curr_main_set = div_ant_conf.main_lna_conf;
-	curr_bias = div_ant_conf.fast_div_bias;
-
-	antcomb->count++;
-
-	if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) {
-		if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) {
-			ath_lnaconf_alt_good_scan(antcomb, div_ant_conf,
-						  main_rssi_avg);
-			antcomb->alt_good = true;
-		} else {
-			antcomb->alt_good = false;
+		if (!rs->rs_moreaggr) {
+			rxs->flag |= RX_FLAG_AMPDU_IS_LAST;
+			sc->rx.ampdu_ref++;
 		}
 
-		antcomb->count = 0;
-		antcomb->scan = true;
-		antcomb->scan_not_start = true;
+		if (rs->rs_flags & ATH9K_RX_DELIM_CRC_PRE)
+			rxs->flag |= RX_FLAG_AMPDU_DELIM_CRC_ERROR;
 	}
-
-	if (!antcomb->scan) {
-		if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) {
-			if (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) {
-				/* Switch main and alt LNA */
-				div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-				div_ant_conf.alt_lna_conf  =
-						ATH_ANT_DIV_COMB_LNA1;
-			} else if (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) {
-				div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-				div_ant_conf.alt_lna_conf  =
-						ATH_ANT_DIV_COMB_LNA2;
-			}
-
-			goto div_comb_done;
-		} else if ((curr_alt_set != ATH_ANT_DIV_COMB_LNA1) &&
-			   (curr_alt_set != ATH_ANT_DIV_COMB_LNA2)) {
-			/* Set alt to another LNA */
-			if (curr_main_set == ATH_ANT_DIV_COMB_LNA2)
-				div_ant_conf.alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-			else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1)
-				div_ant_conf.alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-
-			goto div_comb_done;
-		}
-
-		if ((alt_rssi_avg < (main_rssi_avg +
-		    ATH_ANT_DIV_COMB_LNA1_LNA2_DELTA)))
-			goto div_comb_done;
-	}
-
-	if (!antcomb->scan_not_start) {
-		switch (curr_alt_set) {
-		case ATH_ANT_DIV_COMB_LNA2:
-			antcomb->rssi_lna2 = alt_rssi_avg;
-			antcomb->rssi_lna1 = main_rssi_avg;
-			antcomb->scan = true;
-			/* set to A+B */
-			div_ant_conf.main_lna_conf =
-				ATH_ANT_DIV_COMB_LNA1;
-			div_ant_conf.alt_lna_conf  =
-				ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-			break;
-		case ATH_ANT_DIV_COMB_LNA1:
-			antcomb->rssi_lna1 = alt_rssi_avg;
-			antcomb->rssi_lna2 = main_rssi_avg;
-			antcomb->scan = true;
-			/* set to A+B */
-			div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
-			div_ant_conf.alt_lna_conf  =
-				ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-			break;
-		case ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2:
-			antcomb->rssi_add = alt_rssi_avg;
-			antcomb->scan = true;
-			/* set to A-B */
-			div_ant_conf.alt_lna_conf =
-				ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-			break;
-		case ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2:
-			antcomb->rssi_sub = alt_rssi_avg;
-			antcomb->scan = false;
-			if (antcomb->rssi_lna2 >
-			    (antcomb->rssi_lna1 +
-			    ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)) {
-				/* use LNA2 as main LNA */
-				if ((antcomb->rssi_add > antcomb->rssi_lna1) &&
-				    (antcomb->rssi_add > antcomb->rssi_sub)) {
-					/* set to A+B */
-					div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-					div_ant_conf.alt_lna_conf  =
-						ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-				} else if (antcomb->rssi_sub >
-					   antcomb->rssi_lna1) {
-					/* set to A-B */
-					div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-					div_ant_conf.alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-				} else {
-					/* set to LNA1 */
-					div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-					div_ant_conf.alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-				}
-			} else {
-				/* use LNA1 as main LNA */
-				if ((antcomb->rssi_add > antcomb->rssi_lna2) &&
-				    (antcomb->rssi_add > antcomb->rssi_sub)) {
-					/* set to A+B */
-					div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-					div_ant_conf.alt_lna_conf  =
-						ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
-				} else if (antcomb->rssi_sub >
-					   antcomb->rssi_lna1) {
-					/* set to A-B */
-					div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-					div_ant_conf.alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
-				} else {
-					/* set to LNA2 */
-					div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-					div_ant_conf.alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-				}
-			}
-			break;
-		default:
-			break;
-		}
-	} else {
-		if (!antcomb->alt_good) {
-			antcomb->scan_not_start = false;
-			/* Set alt to another LNA */
-			if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) {
-				div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-				div_ant_conf.alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-			} else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) {
-				div_ant_conf.main_lna_conf =
-						ATH_ANT_DIV_COMB_LNA1;
-				div_ant_conf.alt_lna_conf =
-						ATH_ANT_DIV_COMB_LNA2;
-			}
-			goto div_comb_done;
-		}
-	}
-
-	ath_select_ant_div_from_quick_scan(antcomb, &div_ant_conf,
-					   main_rssi_avg, alt_rssi_avg,
-					   alt_ratio);
-
-	antcomb->quick_scan_cnt++;
-
-div_comb_done:
-	ath_ant_div_conf_fast_divbias(&div_ant_conf);
-
-	ath9k_hw_antdiv_comb_conf_set(sc->sc_ah, &div_ant_conf);
-
-	antcomb->scan_start_time = jiffies;
-	antcomb->total_pkt_count = 0;
-	antcomb->main_total_rssi = 0;
-	antcomb->alt_total_rssi = 0;
-	antcomb->main_recv_cnt = 0;
-	antcomb->alt_recv_cnt = 0;
 }
 
 int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 {
-	struct ath_buf *bf;
-	struct sk_buff *skb = NULL, *requeue_skb;
+	struct ath_rxbuf *bf;
+	struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb;
 	struct ieee80211_rx_status *rxs;
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
-	/*
-	 * The hw can techncically differ from common->hw when using ath9k
-	 * virtual wiphy so to account for that we iterate over the active
-	 * wiphys and find the appropriate wiphy and therefore hw.
-	 */
-	struct ieee80211_hw *hw = NULL;
-	struct ieee80211_hdr *hdr;
+	struct ieee80211_hw *hw = sc->hw;
 	int retval;
-	bool decrypt_error = false;
 	struct ath_rx_status rs;
 	enum ath9k_rx_qtype qtype;
 	bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
 	int dma_type;
-	u8 rx_status_len = ah->caps.rx_status_len;
 	u64 tsf = 0;
-	u32 tsf_lower = 0;
 	unsigned long flags;
+	dma_addr_t new_buf_addr;
+	unsigned int budget = 512;
 
 	if (edma)
 		dma_type = DMA_BIDIRECTIONAL;
@@ -1641,15 +988,11 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 		dma_type = DMA_FROM_DEVICE;
 
 	qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
-	spin_lock_bh(&sc->rx.rxbuflock);
 
 	tsf = ath9k_hw_gettsf64(ah);
-	tsf_lower = tsf & 0xffffffff;
 
 	do {
-		/* If handling rx interrupt and flush is in progress => exit */
-		if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0))
-			break;
+		bool decrypt_error = false;
 
 		memset(&rs, 0, sizeof(rs));
 		if (edma)
@@ -1664,33 +1007,22 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 		if (!skb)
 			continue;
 
-		hdr = (struct ieee80211_hdr *) (skb->data + rx_status_len);
-		rxs =  IEEE80211_SKB_RXCB(skb);
-
-		hw = ath_get_virt_hw(sc, hdr);
-
-		ath_debug_stat_rx(sc, &rs);
-
 		/*
-		 * If we're asked to flush receive queue, directly
-		 * chain it back at the queue without processing it.
+		 * Take frame header from the first fragment and RX status from
+		 * the last one.
 		 */
-		if (flush)
-			goto requeue;
-
-		retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
-						 rxs, &decrypt_error);
-		if (retval)
-			goto requeue;
+		if (sc->rx.frag)
+			hdr_skb = sc->rx.frag;
+		else
+			hdr_skb = skb;
 
-		rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
-		if (rs.rs_tstamp > tsf_lower &&
-		    unlikely(rs.rs_tstamp - tsf_lower > 0x10000000))
-			rxs->mactime -= 0x100000000ULL;
+		rxs = IEEE80211_SKB_RXCB(hdr_skb);
+		memset(rxs, 0, sizeof(struct ieee80211_rx_status));
 
-		if (rs.rs_tstamp < tsf_lower &&
-		    unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
-			rxs->mactime += 0x100000000ULL;
+		retval = ath9k_rx_skb_preprocess(sc, hdr_skb, &rs, rxs,
+						 &decrypt_error, tsf);
+		if (retval)
+			goto requeue_drop_frag;
 
 		/* Ensure we always have an skb to requeue once we are done
 		 * processing the current buffer's skb */
@@ -1700,72 +1032,110 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 		 * tell hardware it can give us a new frame using the old
 		 * skb and put it at the tail of the sc->rx.rxbuf list for
 		 * processing. */
-		if (!requeue_skb)
-			goto requeue;
+		if (!requeue_skb) {
+			RX_STAT_INC(rx_oom_err);
+			goto requeue_drop_frag;
+		}
+
+		/* We will now give hardware our shiny new allocated skb */
+		new_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
+					      common->rx_bufsize, dma_type);
+		if (unlikely(dma_mapping_error(sc->dev, new_buf_addr))) {
+			dev_kfree_skb_any(requeue_skb);
+			goto requeue_drop_frag;
+		}
 
 		/* Unmap the frame */
 		dma_unmap_single(sc->dev, bf->bf_buf_addr,
-				 common->rx_bufsize,
-				 dma_type);
+				 common->rx_bufsize, dma_type);
+
+		bf->bf_mpdu = requeue_skb;
+		bf->bf_buf_addr = new_buf_addr;
 
 		skb_put(skb, rs.rs_datalen + ah->caps.rx_status_len);
 		if (ah->caps.rx_status_len)
 			skb_pull(skb, ah->caps.rx_status_len);
 
-		ath9k_rx_skb_postprocess(common, skb, &rs,
-					 rxs, decrypt_error);
+		if (!rs.rs_more)
+			ath9k_cmn_rx_skb_postprocess(common, hdr_skb, &rs,
+						     rxs, decrypt_error);
 
-		/* We will now give hardware our shiny new allocated skb */
-		bf->bf_mpdu = requeue_skb;
-		bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
-						 common->rx_bufsize,
-						 dma_type);
-		if (unlikely(dma_mapping_error(sc->dev,
-			  bf->bf_buf_addr))) {
-			dev_kfree_skb_any(requeue_skb);
-			bf->bf_mpdu = NULL;
-			bf->bf_buf_addr = 0;
-			ath_print(common, ATH_DBG_FATAL,
-				  "dma_mapping_error() on RX\n");
-			ath_rx_send_to_mac80211(hw, sc, skb, rxs);
-			break;
+		if (rs.rs_more) {
+			RX_STAT_INC(rx_frags);
+			/*
+			 * rs_more indicates chained descriptors which can be
+			 * used to link buffers together for a sort of
+			 * scatter-gather operation.
+			 */
+			if (sc->rx.frag) {
+				/* too many fragments - cannot handle frame */
+				dev_kfree_skb_any(sc->rx.frag);
+				dev_kfree_skb_any(skb);
+				RX_STAT_INC(rx_too_many_frags_err);
+				skb = NULL;
+			}
+			sc->rx.frag = skb;
+			goto requeue;
 		}
 
-		/*
-		 * change the default rx antenna if rx diversity chooses the
-		 * other antenna 3 times in a row.
-		 */
-		if (sc->rx.defant != rs.rs_antenna) {
-			if (++sc->rx.rxotherant >= 3)
-				ath_setdefantenna(sc, rs.rs_antenna);
-		} else {
-			sc->rx.rxotherant = 0;
+		if (sc->rx.frag) {
+			int space = skb->len - skb_tailroom(hdr_skb);
+
+			if (pskb_expand_head(hdr_skb, 0, space, GFP_ATOMIC) < 0) {
+				dev_kfree_skb(skb);
+				RX_STAT_INC(rx_oom_err);
+				goto requeue_drop_frag;
+			}
+
+			sc->rx.frag = NULL;
+
+			skb_copy_from_linear_data(skb, skb_put(hdr_skb, skb->len),
+						  skb->len);
+			dev_kfree_skb_any(skb);
+			skb = hdr_skb;
 		}
 
+		if (rxs->flag & RX_FLAG_MMIC_STRIPPED)
+			skb_trim(skb, skb->len - 8);
+
 		spin_lock_irqsave(&sc->sc_pm_lock, flags);
-		if (unlikely(ath9k_check_auto_sleep(sc) ||
-			     (sc->ps_flags & (PS_WAIT_FOR_BEACON |
-					      PS_WAIT_FOR_CAB |
-					      PS_WAIT_FOR_PSPOLL_DATA))))
-			ath_rx_ps(sc, skb);
+		if ((sc->ps_flags & (PS_WAIT_FOR_BEACON |
+				     PS_WAIT_FOR_CAB |
+				     PS_WAIT_FOR_PSPOLL_DATA)) ||
+		    ath9k_check_auto_sleep(sc))
+			ath_rx_ps(sc, skb, rs.is_mybeacon);
 		spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
 
-		if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB)
-			ath_ant_comb_scan(sc, &rs);
+		ath9k_antenna_check(sc, &rs);
+		ath9k_apply_ampdu_details(sc, &rs, rxs);
+		ath_debug_rate_stats(sc, &rs, skb);
 
-		ath_rx_send_to_mac80211(hw, sc, skb, rxs);
+		ieee80211_rx(hw, skb);
 
+requeue_drop_frag:
+		if (sc->rx.frag) {
+			dev_kfree_skb_any(sc->rx.frag);
+			sc->rx.frag = NULL;
+		}
 requeue:
-		if (edma) {
-			list_add_tail(&bf->list, &sc->rx.rxbuf);
+		list_add_tail(&bf->list, &sc->rx.rxbuf);
+
+		if (!edma) {
+			ath_rx_buf_relink(sc, bf, flush);
+			if (!flush)
+				ath9k_hw_rxena(ah);
+		} else if (!flush) {
 			ath_rx_edma_buf_link(sc, qtype);
-		} else {
-			list_move_tail(&bf->list, &sc->rx.rxbuf);
-			ath_rx_buf_link(sc, bf);
 		}
+
+		if (!budget--)
+			break;
 	} while (1);
 
-	spin_unlock_bh(&sc->rx.rxbuflock);
+	if (!(ah->imask & ATH9K_INT_RXEOL)) {
+		ah->imask |= (ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
+		ath9k_hw_set_interrupts(ah);
+	}
 
 	return 0;
 }