diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index a8c050085648f1ad9bcd2c39c87ad95654f5fd37..4473278efc5e3962deb7246bf3cb60364ddb657a 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -721,6 +721,7 @@ extern int ath9k_modparam_nohwcrypt;
 extern int led_blink;
 extern bool is_ath9k_unloaded;
 
+u8 ath9k_parse_mpdudensity(u8 mpdudensity);
 irqreturn_t ath_isr(int irq, void *dev);
 int ath9k_init_device(u16 devid, struct ath_softc *sc,
 		    const struct ath_bus_ops *bus_ops);
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 85f9ab4fa26ee9b19fcd5fb40d1777dce8a9fe1c..e2e69585d674479c3babbaa7b14d94083c4b08ee 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -19,7 +19,7 @@
 #include "ath9k.h"
 #include "btcoex.h"
 
-static u8 parse_mpdudensity(u8 mpdudensity)
+u8 ath9k_parse_mpdudensity(u8 mpdudensity)
 {
 	/*
 	 * 802.11n D2.0 defined values for "Minimum MPDU Start Spacing":
@@ -320,6 +320,7 @@ static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta,
 			    struct ieee80211_vif *vif)
 {
 	struct ath_node *an;
+	u8 density;
 	an = (struct ath_node *)sta->drv_priv;
 
 #ifdef CONFIG_ATH9K_DEBUGFS
@@ -334,7 +335,8 @@ static void ath_node_attach(struct ath_softc *sc, struct ieee80211_sta *sta,
 		ath_tx_node_init(sc, an);
 		an->maxampdu = 1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
 				     sta->ht_cap.ampdu_factor);
-		an->mpdudensity = parse_mpdudensity(sta->ht_cap.ampdu_density);
+		density = ath9k_parse_mpdudensity(sta->ht_cap.ampdu_density);
+		an->mpdudensity = density;
 	}
 }
 
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index f777ddcd11726920a4492e5ce1d190e143e27ca4..2afc5e289df582c5bff4fdd575244557208121ab 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1175,6 +1175,7 @@ int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
 {
 	struct ath_atx_tid *txtid;
 	struct ath_node *an;
+	u8 density;
 
 	an = (struct ath_node *)sta->drv_priv;
 	txtid = ATH_AN_2_TID(an, tid);
@@ -1182,6 +1183,17 @@ int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
 	if (txtid->state & (AGGR_CLEANUP | AGGR_ADDBA_COMPLETE))
 		return -EAGAIN;
 
+	/* update ampdu factor/density, they may have changed. This may happen
+	 * in HT IBSS when a beacon with HT-info is received after the station
+	 * has already been added.
+	 */
+	if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) {
+		an->maxampdu = 1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
+				     sta->ht_cap.ampdu_factor);
+		density = ath9k_parse_mpdudensity(sta->ht_cap.ampdu_density);
+		an->mpdudensity = density;
+	}
+
 	txtid->state |= AGGR_ADDBA_PROGRESS;
 	txtid->paused = true;
 	*ssn = txtid->seq_start = txtid->seq_next;