diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 099dac9..8ceda33 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -118,7 +118,7 @@
 		 sdata->u.sta.flags & IEEE80211_STA_AUTHENTICATED ? "AUTH\n" : "",
 		 sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED ? "ASSOC\n" : "",
 		 sdata->u.sta.flags & IEEE80211_STA_PROBEREQ_POLL ? "PROBEREQ POLL\n" : "",
-		 sdata->use_protection ? "CTS prot\n" : "");
+		 sdata->flags & IEEE80211_SDATA_USE_PROTECTION ? "CTS prot\n" : "");
 }
 __IEEE80211_IF_FILE(flags);
 
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index be678c6..50d7af3 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -555,23 +555,21 @@
 	unsigned short flags;
 
 	netif_tx_lock_nested(local->mdev, TX_LOCK_MASTER);
-	if (((dev->flags & IFF_ALLMULTI) != 0) ^ (sdata->allmulti != 0)) {
-		if (sdata->allmulti) {
-			sdata->allmulti = 0;
+	if (((dev->flags & IFF_ALLMULTI) != 0) ^
+	    ((sdata->flags & IEEE80211_SDATA_ALLMULTI) != 0)) {
+		if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 			local->iff_allmultis--;
-		} else {
-			sdata->allmulti = 1;
+		else
 			local->iff_allmultis++;
-		}
+		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 	}
-	if (((dev->flags & IFF_PROMISC) != 0) ^ (sdata->promisc != 0)) {
-		if (sdata->promisc) {
-			sdata->promisc = 0;
+	if (((dev->flags & IFF_PROMISC) != 0) ^
+	    ((sdata->flags & IEEE80211_SDATA_PROMISC) != 0)) {
+		if (sdata->flags & IEEE80211_SDATA_PROMISC)
 			local->iff_promiscs--;
-		} else {
-			sdata->promisc = 1;
+		else
 			local->iff_promiscs++;
-		}
+		sdata->flags ^= IEEE80211_SDATA_PROMISC;
 	}
 	if (dev->mc_count != sdata->mc_count) {
 		local->mc_count = local->mc_count - sdata->mc_count +
@@ -740,16 +738,16 @@
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	if (local->ops->erp_ie_changed)
 		local->ops->erp_ie_changed(local_to_hw(local), changes,
-					   sdata->use_protection,
-					   !sdata->short_preamble);
+			!!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
+			!(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
 }
 
 void ieee80211_reset_erp_info(struct net_device *dev)
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 
-	sdata->short_preamble = 0;
-	sdata->use_protection = 0;
+	sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
+			IEEE80211_SDATA_SHORT_PREAMBLE);
 	ieee80211_erp_info_change_notify(dev,
 					 IEEE80211_ERP_CHANGE_PROTECTION |
 					 IEEE80211_ERP_CHANGE_PREAMBLE);
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 28c5d51..ef633a04 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -277,6 +277,14 @@
 };
 
 
+/* flags used in struct ieee80211_sub_if_data.flags */
+#define IEEE80211_SDATA_ALLMULTI	BIT(0)
+#define IEEE80211_SDATA_PROMISC		BIT(1)
+#define IEEE80211_SDATA_USE_PROTECTION	BIT(2) /* CTS protect ERP frames */
+/* use short preamble with IEEE 802.11b: this flag is set when the AP or beacon
+ * generator reports that there are no present stations that cannot support short
+ * preambles */
+#define IEEE80211_SDATA_SHORT_PREAMBLE	BIT(3)
 struct ieee80211_sub_if_data {
 	struct list_head list;
 	unsigned int type;
@@ -287,14 +295,8 @@
 	struct ieee80211_local *local;
 
 	int mc_count;
-	unsigned int allmulti:1;
-	unsigned int promisc:1;
-	unsigned int use_protection:1; /* CTS protect ERP frames */
 
-	/* use short preamble with IEEE 802.11b: this flag is set when the AP
-	 * or beacon generator reports that there are no present stations that
-	 * cannot support short preambles */
-	unsigned int short_preamble:1;
+	unsigned int flags;
 
 	struct net_device_stats stats;
 	int drop_unencrypted;
diff --git a/net/mac80211/ieee80211_ioctl.c b/net/mac80211/ieee80211_ioctl.c
index ea2e0f9..9964f05 100644
--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -1063,8 +1063,12 @@
 
 	case PRISM2_PARAM_CTS_PROTECT_ERP_FRAMES:
 		if (sdata->type == IEEE80211_IF_TYPE_AP) {
-			sdata->use_protection = !!value;
-			ieee80211_erp_info_change_notify(dev, IEEE80211_ERP_CHANGE_PROTECTION);
+			if (value)
+				sdata->flags |= IEEE80211_SDATA_USE_PROTECTION;
+			else
+				sdata->flags &= ~IEEE80211_SDATA_USE_PROTECTION;
+			ieee80211_erp_info_change_notify(dev,
+					IEEE80211_ERP_CHANGE_PROTECTION);
 		} else {
 			ret = -ENOENT;
 		}
@@ -1072,8 +1076,12 @@
 
 	case PRISM2_PARAM_PREAMBLE:
 		if (sdata->type != IEEE80211_IF_TYPE_AP) {
-			sdata->short_preamble = !!value;
-			ieee80211_erp_info_change_notify(dev, IEEE80211_ERP_CHANGE_PREAMBLE);
+			if (value)
+				sdata->flags |= IEEE80211_SDATA_SHORT_PREAMBLE;
+			else
+				sdata->flags &= ~IEEE80211_SDATA_SHORT_PREAMBLE;
+			ieee80211_erp_info_change_notify(dev,
+					IEEE80211_ERP_CHANGE_PREAMBLE);
 		} else {
 			ret = -ENOENT;
 		}
@@ -1167,11 +1175,11 @@
 		break;
 
 	case PRISM2_PARAM_CTS_PROTECT_ERP_FRAMES:
-		*param = sdata->use_protection;
+		*param = !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION);
 		break;
 
 	case PRISM2_PARAM_PREAMBLE:
-		*param = sdata->short_preamble;
+		*param = !!(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
 		break;
 
 	case PRISM2_PARAM_SHORT_SLOT_TIME:
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 6a57333..fe94ebfc 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -321,7 +321,7 @@
 	int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
 	u8 changes = 0;
 
-	if (use_protection != sdata->use_protection) {
+	if (use_protection != !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION)) {
 		if (net_ratelimit()) {
 			printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
 			       MAC_FMT ")\n",
@@ -329,11 +329,14 @@
 			       use_protection ? "enabled" : "disabled",
 			       MAC_ARG(ifsta->bssid));
 		}
-		sdata->use_protection = use_protection;
+		if (use_protection)
+			sdata->flags |= IEEE80211_SDATA_USE_PROTECTION;
+		else
+			sdata->flags &= ~IEEE80211_SDATA_USE_PROTECTION;
 		changes |= IEEE80211_ERP_CHANGE_PROTECTION;
 	}
 
-	if (!preamble_mode != sdata->short_preamble) {
+	if (preamble_mode != !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE)) {
 		if (net_ratelimit()) {
 			printk(KERN_DEBUG "%s: switched to %s barker preamble"
 			       " (BSSID=" MAC_FMT ")\n",
@@ -342,7 +345,10 @@
 					"short" : "long",
 			       MAC_ARG(ifsta->bssid));
 		}
-		sdata->short_preamble = !preamble_mode;
+		if (preamble_mode)
+			sdata->flags &= ~IEEE80211_SDATA_SHORT_PREAMBLE;
+		else
+			sdata->flags |= IEEE80211_SDATA_SHORT_PREAMBLE;
 		changes |= IEEE80211_ERP_CHANGE_PREAMBLE;
 	}
 
@@ -2307,8 +2313,9 @@
 			       "for IBSS beacon\n", dev->name);
 			break;
 		}
-		control.tx_rate = (sdata->short_preamble &&
-				   (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
+		control.tx_rate =
+			((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
+			(rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
 			rate->val2 : rate->val;
 		control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
 		control.power_level = local->hw.conf.power_level;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index af94fb5..b52e330 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1288,7 +1288,7 @@
 		} else if (!multicast &&
 			   compare_ether_addr(sdata->dev->dev_addr,
 					      hdr->addr1) != 0) {
-			if (!sdata->promisc)
+			if (!(sdata->flags & IEEE80211_SDATA_PROMISC))
 				return 0;
 			rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
 		}
@@ -1303,7 +1303,7 @@
 		} else if (!multicast &&
 			   compare_ether_addr(sdata->dev->dev_addr,
 					      hdr->addr1) != 0) {
-			if (!sdata->promisc)
+			if (!(sdata->flags & IEEE80211_SDATA_PROMISC))
 				return 0;
 			rx->flags &= ~IEEE80211_TXRXD_RXRA_MATCH;
 		} else if (!rx->sta)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 01e7a73..ddb104a 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -173,7 +173,7 @@
 	 * to closest integer */
 
 	dur = ieee80211_frame_duration(local, 10, rate, erp,
-				       tx->sdata->short_preamble);
+		       tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
 
 	if (next_frag_len) {
 		/* Frame is fragmented: duration increases with time needed to
@@ -181,8 +181,9 @@
 		dur *= 2; /* ACK + SIFS */
 		/* next fragment */
 		dur += ieee80211_frame_duration(local, next_frag_len,
-						txrate->rate, erp,
-						tx->sdata->short_preamble);
+				txrate->rate, erp,
+				tx->sdata->flags &
+					IEEE80211_SDATA_SHORT_PREAMBLE);
 	}
 
 	return dur;
@@ -613,7 +614,7 @@
 	if (!tx->u.tx.rate)
 		return TXRX_DROP;
 	if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
-	    tx->sdata->use_protection &&
+	    (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
 	    (tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
 		tx->u.tx.last_frag_rate = tx->u.tx.rate;
 		if (extra.probe)
@@ -670,7 +671,7 @@
 	if (mode->mode == MODE_IEEE80211G &&
 	    (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
 	    (tx->flags & IEEE80211_TXRXD_TXUNICAST) &&
-	    tx->sdata->use_protection &&
+	    (tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
 	    !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
 		control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
 
@@ -679,7 +680,7 @@
 	 * available on the network at the current point in time. */
 	if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
 	    (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
-	    tx->sdata->short_preamble &&
+	    (tx->sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
 	    (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
 		tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
 	}
@@ -1777,8 +1778,9 @@
 			return NULL;
 		}
 
-		control->tx_rate = (sdata->short_preamble &&
-				    (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
+		control->tx_rate =
+			((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
+			(rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
 			rate->val2 : rate->val;
 		control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
 		control->power_level = local->hw.conf.power_level;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 091ac0d..07686bd 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -329,7 +329,7 @@
 	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
 	erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
 	dur = ieee80211_frame_duration(local, frame_len, rate,
-				       erp, sdata->short_preamble);
+		       erp, sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
 
 	dev_put(bdev);
 	return cpu_to_le16(dur);
@@ -352,7 +352,7 @@
 		return 0;
 
 	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
-	short_preamble = sdata->short_preamble;
+	short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE;
 
 	rate = frame_txctl->rts_rate;
 	erp = !!(rate->flags & IEEE80211_RATE_ERP);
@@ -388,7 +388,7 @@
 		return 0;
 
 	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
-	short_preamble = sdata->short_preamble;
+	short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE;
 
 	rate = frame_txctl->rts_rate;
 	erp = !!(rate->flags & IEEE80211_RATE_ERP);