diff --git a/drivers/net/wireless/adm8211.c b/drivers/net/wireless/adm8211.c
index 5695911..b80f514 100644
--- a/drivers/net/wireless/adm8211.c
+++ b/drivers/net/wireless/adm8211.c
@@ -1328,16 +1328,39 @@
 	}
 }
 
+static u64 adm8211_prepare_multicast(struct ieee80211_hw *hw,
+				     int mc_count, struct dev_addr_list *mclist)
+{
+	unsigned int bit_nr, i;
+	u32 mc_filter[2];
+
+	mc_filter[1] = mc_filter[0] = 0;
+
+	for (i = 0; i < mc_count; i++) {
+		if (!mclist)
+			break;
+		bit_nr = ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26;
+
+		bit_nr &= 0x3F;
+		mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
+		mclist = mclist->next;
+	}
+
+	return mc_filter[0] | ((u64)(mc_filter[1]) << 32);
+}
+
 static void adm8211_configure_filter(struct ieee80211_hw *dev,
 				     unsigned int changed_flags,
 				     unsigned int *total_flags,
-				     int mc_count, struct dev_mc_list *mclist)
+				     u64 multicast)
 {
 	static const u8 bcast[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 	struct adm8211_priv *priv = dev->priv;
-	unsigned int bit_nr, new_flags;
+	unsigned int new_flags;
 	u32 mc_filter[2];
-	int i;
+
+	mc_filter[0] = multicast;
+	mc_filter[1] = multicast >> 32;
 
 	new_flags = 0;
 
@@ -1346,23 +1369,13 @@
 		priv->nar |= ADM8211_NAR_PR;
 		priv->nar &= ~ADM8211_NAR_MM;
 		mc_filter[1] = mc_filter[0] = ~0;
-	} else if ((*total_flags & FIF_ALLMULTI) || (mc_count > 32)) {
+	} else if (*total_flags & FIF_ALLMULTI || multicast == ~(0ULL)) {
 		new_flags |= FIF_ALLMULTI;
 		priv->nar &= ~ADM8211_NAR_PR;
 		priv->nar |= ADM8211_NAR_MM;
 		mc_filter[1] = mc_filter[0] = ~0;
 	} else {
 		priv->nar &= ~(ADM8211_NAR_MM | ADM8211_NAR_PR);
-		mc_filter[1] = mc_filter[0] = 0;
-		for (i = 0; i < mc_count; i++) {
-			if (!mclist)
-				break;
-			bit_nr = ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26;
-
-			bit_nr &= 0x3F;
-			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
-			mclist = mclist->next;
-		}
 	}
 
 	ADM8211_IDLE_RX();
@@ -1757,6 +1770,7 @@
 	.remove_interface	= adm8211_remove_interface,
 	.config			= adm8211_config,
 	.bss_info_changed	= adm8211_bss_info_changed,
+	.prepare_multicast	= adm8211_prepare_multicast,
 	.configure_filter	= adm8211_configure_filter,
 	.get_stats		= adm8211_get_stats,
 	.get_tx_stats		= adm8211_get_tx_stats,
diff --git a/drivers/net/wireless/at76c50x-usb.c b/drivers/net/wireless/at76c50x-usb.c
index 7218dba..a6e1954 100644
--- a/drivers/net/wireless/at76c50x-usb.c
+++ b/drivers/net/wireless/at76c50x-usb.c
@@ -1997,15 +1997,14 @@
 /* must be atomic */
 static void at76_configure_filter(struct ieee80211_hw *hw,
 				  unsigned int changed_flags,
-				  unsigned int *total_flags, int mc_count,
-				  struct dev_addr_list *mc_list)
+				  unsigned int *total_flags, u64 multicast)
 {
 	struct at76_priv *priv = hw->priv;
 	int flags;
 
 	at76_dbg(DBG_MAC80211, "%s(): changed_flags=0x%08x "
-		 "total_flags=0x%08x mc_count=%d",
-		 __func__, changed_flags, *total_flags, mc_count);
+		 "total_flags=0x%08x",
+		 __func__, changed_flags, *total_flags);
 
 	flags = changed_flags & AT76_SUPPORTED_FILTERS;
 	*total_flags = AT76_SUPPORTED_FILTERS;
diff --git a/drivers/net/wireless/ath/ar9170/main.c b/drivers/net/wireless/ath/ar9170/main.c
index ea8c941..6a9462e 100644
--- a/drivers/net/wireless/ath/ar9170/main.c
+++ b/drivers/net/wireless/ath/ar9170/main.c
@@ -2100,10 +2100,29 @@
 	mutex_unlock(&ar->mutex);
 }
 
+static u64 ar9170_op_prepare_multicast(struct ieee80211_hw *hw, int mc_count,
+				       struct dev_addr_list *mclist)
+{
+	u64 mchash;
+	int i;
+
+	/* always get broadcast frames */
+	mchash = 1ULL << (0xff >> 2);
+
+	for (i = 0; i < mc_count; i++) {
+		if (WARN_ON(!mclist))
+			break;
+		mchash |= 1ULL << (mclist->dmi_addr[5] >> 2);
+		mclist = mclist->next;
+	}
+
+	return mchash;
+}
+
 static void ar9170_op_configure_filter(struct ieee80211_hw *hw,
 				       unsigned int changed_flags,
 				       unsigned int *new_flags,
-				       int mc_count, struct dev_mc_list *mclist)
+				       u64 multicast)
 {
 	struct ar9170 *ar = hw->priv;
 
@@ -2116,24 +2135,11 @@
 	 * then checking the error flags, later.
 	 */
 
-	if (changed_flags & FIF_ALLMULTI) {
-		if (*new_flags & FIF_ALLMULTI) {
-			ar->want_mc_hash = ~0ULL;
-		} else {
-			u64 mchash;
-			int i;
+	if (changed_flags & FIF_ALLMULTI && *new_flags & FIF_ALLMULTI)
+			multicast = ~0ULL;
 
-			/* always get broadcast frames */
-			mchash = 1ULL << (0xff >> 2);
-
-			for (i = 0; i < mc_count; i++) {
-				if (WARN_ON(!mclist))
-					break;
-				mchash |= 1ULL << (mclist->dmi_addr[5] >> 2);
-				mclist = mclist->next;
-			}
-		ar->want_mc_hash = mchash;
-		}
+	if (multicast != ar->want_mc_hash) {
+		ar->want_mc_hash = multicast;
 		set_bit(AR9170_FILTER_CHANGED_MULTICAST, &ar->filter_changed);
 	}
 
@@ -2543,6 +2549,7 @@
 	.add_interface		= ar9170_op_add_interface,
 	.remove_interface	= ar9170_op_remove_interface,
 	.config			= ar9170_op_config,
+	.prepare_multicast	= ar9170_op_prepare_multicast,
 	.configure_filter	= ar9170_op_configure_filter,
 	.conf_tx		= ar9170_conf_tx,
 	.bss_info_changed	= ar9170_op_bss_info_changed,
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index 2b3cf39..3951b5b 100644
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -229,10 +229,12 @@
 static void ath5k_remove_interface(struct ieee80211_hw *hw,
 		struct ieee80211_if_init_conf *conf);
 static int ath5k_config(struct ieee80211_hw *hw, u32 changed);
+static u64 ath5k_prepare_multicast(struct ieee80211_hw *hw,
+				   int mc_count, struct dev_addr_list *mc_list);
 static void ath5k_configure_filter(struct ieee80211_hw *hw,
 		unsigned int changed_flags,
 		unsigned int *new_flags,
-		int mc_count, struct dev_mc_list *mclist);
+		u64 multicast);
 static int ath5k_set_key(struct ieee80211_hw *hw,
 		enum set_key_cmd cmd,
 		struct ieee80211_vif *vif, struct ieee80211_sta *sta,
@@ -260,6 +262,7 @@
 	.add_interface 	= ath5k_add_interface,
 	.remove_interface = ath5k_remove_interface,
 	.config 	= ath5k_config,
+	.prepare_multicast = ath5k_prepare_multicast,
 	.configure_filter = ath5k_configure_filter,
 	.set_key 	= ath5k_set_key,
 	.get_stats 	= ath5k_get_stats,
@@ -2853,6 +2856,37 @@
 	return ret;
 }
 
+static u64 ath5k_prepare_multicast(struct ieee80211_hw *hw,
+				   int mc_count, struct dev_addr_list *mclist)
+{
+	u32 mfilt[2], val;
+	int i;
+	u8 pos;
+
+	mfilt[0] = 0;
+	mfilt[1] = 1;
+
+	for (i = 0; i < mc_count; i++) {
+		if (!mclist)
+			break;
+		/* calculate XOR of eight 6-bit values */
+		val = get_unaligned_le32(mclist->dmi_addr + 0);
+		pos = (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
+		val = get_unaligned_le32(mclist->dmi_addr + 3);
+		pos ^= (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
+		pos &= 0x3f;
+		mfilt[pos / 32] |= (1 << (pos % 32));
+		/* XXX: we might be able to just do this instead,
+		* but not sure, needs testing, if we do use this we'd
+		* neet to inform below to not reset the mcast */
+		/* ath5k_hw_set_mcast_filterindex(ah,
+		 *      mclist->dmi_addr[5]); */
+		mclist = mclist->next;
+	}
+
+	return ((u64)(mfilt[1]) << 32) | mfilt[0];
+}
+
 #define SUPPORTED_FIF_FLAGS \
 	FIF_PROMISC_IN_BSS |  FIF_ALLMULTI | FIF_FCSFAIL | \
 	FIF_PLCPFAIL | FIF_CONTROL | FIF_OTHER_BSS | \
@@ -2878,16 +2912,14 @@
 static void ath5k_configure_filter(struct ieee80211_hw *hw,
 		unsigned int changed_flags,
 		unsigned int *new_flags,
-		int mc_count, struct dev_mc_list *mclist)
+		u64 multicast)
 {
 	struct ath5k_softc *sc = hw->priv;
 	struct ath5k_hw *ah = sc->ah;
-	u32 mfilt[2], val, rfilt;
-	u8 pos;
-	int i;
+	u32 mfilt[2], rfilt;
 
-	mfilt[0] = 0;
-	mfilt[1] = 0;
+	mfilt[0] = multicast;
+	mfilt[1] = multicast >> 32;
 
 	/* Only deal with supported flags */
 	changed_flags &= SUPPORTED_FIF_FLAGS;
@@ -2913,24 +2945,6 @@
 	if (*new_flags & FIF_ALLMULTI) {
 		mfilt[0] =  ~0;
 		mfilt[1] =  ~0;
-	} else {
-		for (i = 0; i < mc_count; i++) {
-			if (!mclist)
-				break;
-			/* calculate XOR of eight 6-bit values */
-			val = get_unaligned_le32(mclist->dmi_addr + 0);
-			pos = (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
-			val = get_unaligned_le32(mclist->dmi_addr + 3);
-			pos ^= (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
-			pos &= 0x3f;
-			mfilt[pos / 32] |= (1 << (pos % 32));
-			/* XXX: we might be able to just do this instead,
-			* but not sure, needs testing, if we do use this we'd
-			* neet to inform below to not reset the mcast */
-			/* ath5k_hw_set_mcast_filterindex(ah,
-			 *      mclist->dmi_addr[5]); */
-			mclist = mclist->next;
-		}
 	}
 
 	/* This is the best we can do */
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 3e09b9a..2f9c149 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -2394,8 +2394,7 @@
 static void ath9k_configure_filter(struct ieee80211_hw *hw,
 				   unsigned int changed_flags,
 				   unsigned int *total_flags,
-				   int mc_count,
-				   struct dev_mc_list *mclist)
+				   u64 multicast)
 {
 	struct ath_wiphy *aphy = hw->priv;
 	struct ath_softc *sc = aphy->sc;
diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index c5bece0..78ddbc7 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -3679,7 +3679,7 @@
 
 static void b43_op_configure_filter(struct ieee80211_hw *hw,
 				    unsigned int changed, unsigned int *fflags,
-				    int mc_count, struct dev_addr_list *mc_list)
+				    u64 multicast)
 {
 	struct b43_wl *wl = hw_to_b43_wl(hw);
 	struct b43_wldev *dev = wl->current_dev;
diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
index b143559..b166a6f 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -2836,9 +2836,7 @@
 
 static void b43legacy_op_configure_filter(struct ieee80211_hw *hw,
 					  unsigned int changed,
-					  unsigned int *fflags,
-					  int mc_count,
-					  struct dev_addr_list *mc_list)
+					  unsigned int *fflags,u64 multicast)
 {
 	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
 	struct b43legacy_wldev *dev = wl->current_dev;
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index c0efa66..f1f6dab 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1514,7 +1514,7 @@
 void iwl_configure_filter(struct ieee80211_hw *hw,
 			  unsigned int changed_flags,
 			  unsigned int *total_flags,
-			  int mc_count, struct dev_addr_list *mc_list)
+			  u64 multicast)
 {
 	struct iwl_priv *priv = hw->priv;
 	__le32 *filter_flags = &priv->staging_rxon.filter_flags;
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 4ca025a..62d9036 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -282,8 +282,7 @@
 void iwl_irq_handle_error(struct iwl_priv *priv);
 void iwl_configure_filter(struct ieee80211_hw *hw,
 			  unsigned int changed_flags,
-			  unsigned int *total_flags,
-			  int mc_count, struct dev_addr_list *mc_list);
+			  unsigned int *total_flags, u64 multicast);
 int iwl_hw_nic_init(struct iwl_priv *priv);
 int iwl_setup_mac(struct iwl_priv *priv);
 int iwl_set_hw_params(struct iwl_priv *priv);
diff --git a/drivers/net/wireless/libertas_tf/main.c b/drivers/net/wireless/libertas_tf/main.c
index 4872345..019431d 100644
--- a/drivers/net/wireless/libertas_tf/main.c
+++ b/drivers/net/wireless/libertas_tf/main.c
@@ -366,15 +366,35 @@
 	return 0;
 }
 
+static u64 lbtf_op_prepare_multicast(struct ieee80211_hw *hw,
+				     int mc_count, struct dev_addr_list *mclist)
+{
+	struct lbtf_private *priv = hw->priv;
+	int i;
+
+	if (!mc_count || mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE)
+		return mc_count;
+
+	priv->nr_of_multicastmacaddr = mc_count;
+	for (i = 0; i < mc_count; i++) {
+		if (!mclist)
+			break;
+		memcpy(&priv->multicastlist[i], mclist->da_addr,
+				ETH_ALEN);
+		mclist = mclist->next;
+	}
+
+	return mc_count;
+}
+
 #define SUPPORTED_FIF_FLAGS  (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)
 static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
 			unsigned int changed_flags,
 			unsigned int *new_flags,
-			int mc_count, struct dev_mc_list *mclist)
+			u64 multicast)
 {
 	struct lbtf_private *priv = hw->priv;
 	int old_mac_control = priv->mac_control;
-	int i;
 	changed_flags &= SUPPORTED_FIF_FLAGS;
 	*new_flags &= SUPPORTED_FIF_FLAGS;
 
@@ -386,20 +406,12 @@
 	else
 		priv->mac_control &= ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 	if (*new_flags & (FIF_ALLMULTI) ||
-	    mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
+	    multicast > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
 		priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 		priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
-	} else if (mc_count) {
+	} else if (multicast) {
 		priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
 		priv->mac_control &= ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
-		priv->nr_of_multicastmacaddr = mc_count;
-		for (i = 0; i < mc_count; i++) {
-			if (!mclist)
-				break;
-			memcpy(&priv->multicastlist[i], mclist->da_addr,
-					ETH_ALEN);
-			mclist = mclist->next;
-		}
 		lbtf_cmd_set_mac_multicast_addr(priv);
 	} else {
 		priv->mac_control &= ~(CMD_ACT_MAC_MULTICAST_ENABLE |
@@ -461,6 +473,7 @@
 	.add_interface		= lbtf_op_add_interface,
 	.remove_interface	= lbtf_op_remove_interface,
 	.config			= lbtf_op_config,
+	.prepare_multicast	= lbtf_op_prepare_multicast,
 	.configure_filter	= lbtf_op_configure_filter,
 	.bss_info_changed	= lbtf_op_bss_info_changed,
 };
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 930f5c7..6f6cd43 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -582,9 +582,7 @@
 
 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
 					    unsigned int changed_flags,
-					    unsigned int *total_flags,
-					    int mc_count,
-					    struct dev_addr_list *mc_list)
+					    unsigned int *total_flags,u64 multicast)
 {
 	struct mac80211_hwsim_data *data = hw->priv;
 
diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index 8a6d3af..f843870 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -3251,31 +3251,50 @@
 	return rc;
 }
 
+static u64 mwl8k_prepare_multicast(struct ieee80211_hw *hw,
+				   int mc_count, struct dev_addr_list *mclist)
+{
+	struct mwl8k_configure_filter_worker *worker;
+
+	worker = kzalloc(sizeof(*worker), GFP_ATOMIC);
+
+	if (!worker)
+		return 0;
+
+	/*
+	 * XXX: This is _HORRIBLY_ broken!!
+	 *
+	 *	No locking, the mclist pointer might be invalid as soon as this
+	 *	function returns, something in the list might be invalidated
+	 *	once we get to the worker, etc...
+	 */
+	worker->mc_count = mc_count;
+	worker->mclist = mclist;
+
+	return (u64)worker;
+}
+
 static void mwl8k_configure_filter(struct ieee80211_hw *hw,
 				   unsigned int changed_flags,
 				   unsigned int *total_flags,
-				   int mc_count,
-				   struct dev_addr_list *mclist)
+				   u64 multicast)
 {
 
-	struct mwl8k_configure_filter_worker *worker;
+	struct mwl8k_configure_filter_worker *worker = (void *)multicast;
 	struct mwl8k_priv *priv = hw->priv;
 
 	/* Clear unsupported feature flags */
 	*total_flags &= MWL8K_SUPPORTED_IF_FLAGS;
 
-	if (!(changed_flags & MWL8K_SUPPORTED_IF_FLAGS) && !mc_count)
+	if (!(changed_flags & MWL8K_SUPPORTED_IF_FLAGS))
 		return;
 
-	worker = kzalloc(sizeof(*worker), GFP_ATOMIC);
 	if (worker == NULL)
 		return;
 
 	worker->header.options = MWL8K_WQ_QUEUE_ONLY | MWL8K_WQ_TX_WAIT_EMPTY;
 	worker->changed_flags = changed_flags;
 	worker->total_flags = total_flags;
-	worker->mc_count = mc_count;
-	worker->mclist = mclist;
 
 	mwl8k_queue_work(hw, &worker->header, priv->config_wq,
 			 mwl8k_configure_filter_wt);
@@ -3441,6 +3460,7 @@
 	.remove_interface	= mwl8k_remove_interface,
 	.config			= mwl8k_config,
 	.bss_info_changed	= mwl8k_bss_info_changed,
+	.prepare_multicast	= mwl8k_prepare_multicast,
 	.configure_filter	= mwl8k_configure_filter,
 	.set_rts_threshold	= mwl8k_set_rts_threshold,
 	.conf_tx		= mwl8k_conf_tx,
diff --git a/drivers/net/wireless/p54/main.c b/drivers/net/wireless/p54/main.c
index 77203e3..4d486bf 100644
--- a/drivers/net/wireless/p54/main.c
+++ b/drivers/net/wireless/p54/main.c
@@ -302,7 +302,7 @@
 static void p54_configure_filter(struct ieee80211_hw *dev,
 				 unsigned int changed_flags,
 				 unsigned int *total_flags,
-				 int mc_count, struct dev_mc_list *mclist)
+				 u64 multicast)
 {
 	struct p54_common *priv = dev->priv;
 
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 99e8959..39d7d9b 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -978,7 +978,7 @@
 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 				unsigned int changed_flags,
 				unsigned int *total_flags,
-				int mc_count, struct dev_addr_list *mc_list);
+				u64 multicast);
 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 		      bool set);
 #ifdef CONFIG_RT2X00_LIB_CRYPTO
diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index cb7b6d4..602f126 100644
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -379,7 +379,7 @@
 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 				unsigned int changed_flags,
 				unsigned int *total_flags,
-				int mc_count, struct dev_addr_list *mc_list)
+				u64 multicast)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 
diff --git a/drivers/net/wireless/rtl818x/rtl8180_dev.c b/drivers/net/wireless/rtl818x/rtl8180_dev.c
index 09f46ab..16429c4 100644
--- a/drivers/net/wireless/rtl818x/rtl8180_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8180_dev.c
@@ -728,10 +728,16 @@
 	        priv->rf->conf_erp(dev, info);
 }
 
+static u64 rtl8180_prepare_multicast(struct ieee80211_hw *dev, int mc_count,
+				     struct dev_addr_list *mc_list)
+{
+	return mc_count;
+}
+
 static void rtl8180_configure_filter(struct ieee80211_hw *dev,
 				     unsigned int changed_flags,
 				     unsigned int *total_flags,
-				     int mc_count, struct dev_addr_list *mclist)
+				     u64 multicast)
 {
 	struct rtl8180_priv *priv = dev->priv;
 
@@ -741,7 +747,7 @@
 		priv->rx_conf ^= RTL818X_RX_CONF_CTRL;
 	if (changed_flags & FIF_OTHER_BSS)
 		priv->rx_conf ^= RTL818X_RX_CONF_MONITOR;
-	if (*total_flags & FIF_ALLMULTI || mc_count > 0)
+	if (*total_flags & FIF_ALLMULTI || multicast > 0)
 		priv->rx_conf |= RTL818X_RX_CONF_MULTICAST;
 	else
 		priv->rx_conf &= ~RTL818X_RX_CONF_MULTICAST;
@@ -768,6 +774,7 @@
 	.remove_interface	= rtl8180_remove_interface,
 	.config			= rtl8180_config,
 	.bss_info_changed	= rtl8180_bss_info_changed,
+	.prepare_multicast	= rtl8180_prepare_multicast,
 	.configure_filter	= rtl8180_configure_filter,
 };
 
diff --git a/drivers/net/wireless/rtl818x/rtl8187_dev.c b/drivers/net/wireless/rtl818x/rtl8187_dev.c
index 53f57dc..90f3835 100644
--- a/drivers/net/wireless/rtl818x/rtl8187_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8187_dev.c
@@ -1192,10 +1192,16 @@
 				 info->use_short_preamble);
 }
 
+static u64 rtl8187_prepare_multicast(struct ieee80211_hw *dev,
+				     int mc_count, struct dev_addr_list *mc_list)
+{
+	return mc_count;
+}
+
 static void rtl8187_configure_filter(struct ieee80211_hw *dev,
 				     unsigned int changed_flags,
 				     unsigned int *total_flags,
-				     int mc_count, struct dev_addr_list *mclist)
+				     u64 multicast)
 {
 	struct rtl8187_priv *priv = dev->priv;
 
@@ -1205,7 +1211,7 @@
 		priv->rx_conf ^= RTL818X_RX_CONF_CTRL;
 	if (changed_flags & FIF_OTHER_BSS)
 		priv->rx_conf ^= RTL818X_RX_CONF_MONITOR;
-	if (*total_flags & FIF_ALLMULTI || mc_count > 0)
+	if (*total_flags & FIF_ALLMULTI || multicast > 0)
 		priv->rx_conf |= RTL818X_RX_CONF_MULTICAST;
 	else
 		priv->rx_conf &= ~RTL818X_RX_CONF_MULTICAST;
@@ -1268,6 +1274,7 @@
 	.remove_interface	= rtl8187_remove_interface,
 	.config			= rtl8187_config,
 	.bss_info_changed	= rtl8187_bss_info_changed,
+	.prepare_multicast	= rtl8187_prepare_multicast,
 	.configure_filter	= rtl8187_configure_filter,
 	.conf_tx		= rtl8187_conf_tx
 };
diff --git a/drivers/net/wireless/wl12xx/wl1251_main.c b/drivers/net/wireless/wl12xx/wl1251_main.c
index 7148934..5809ef5 100644
--- a/drivers/net/wireless/wl12xx/wl1251_main.c
+++ b/drivers/net/wireless/wl12xx/wl1251_main.c
@@ -652,9 +652,7 @@
 
 static void wl1251_op_configure_filter(struct ieee80211_hw *hw,
 				       unsigned int changed,
-				       unsigned int *total,
-				       int mc_count,
-				       struct dev_addr_list *mc_list)
+				       unsigned int *total,u64 multicast)
 {
 	struct wl1251 *wl = hw->priv;
 
diff --git a/drivers/net/wireless/wl12xx/wl1271_main.c b/drivers/net/wireless/wl12xx/wl1271_main.c
index 4102d59..754be81 100644
--- a/drivers/net/wireless/wl12xx/wl1271_main.c
+++ b/drivers/net/wireless/wl12xx/wl1271_main.c
@@ -793,9 +793,7 @@
 
 static void wl1271_op_configure_filter(struct ieee80211_hw *hw,
 				       unsigned int changed,
-				       unsigned int *total,
-				       int mc_count,
-				       struct dev_addr_list *mc_list)
+				       unsigned int *total,u64 multicast)
 {
 	struct wl1271 *wl = hw->priv;
 
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index 55b7fbd..6d66635 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -796,18 +796,40 @@
 		dev_err(zd_mac_dev(mac), "set_rx_filter_handler error %d\n", r);
 }
 
+static u64 zd_op_prepare_multicast(struct ieee80211_hw *hw,
+				   int mc_count, struct dev_addr_list *mclist)
+{
+	struct zd_mac *mac = zd_hw_mac(hw);
+	struct zd_mc_hash hash;
+	int i;
+
+	zd_mc_clear(&hash);
+
+	for (i = 0; i < mc_count; i++) {
+		if (!mclist)
+			break;
+		dev_dbg_f(zd_mac_dev(mac), "mc addr %pM\n", mclist->dmi_addr);
+		zd_mc_add_addr(&hash, mclist->dmi_addr);
+		mclist = mclist->next;
+	}
+
+	return hash.low | ((u64)hash.high << 32);
+}
+
 #define SUPPORTED_FIF_FLAGS \
 	(FIF_PROMISC_IN_BSS | FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
 	FIF_OTHER_BSS | FIF_BCN_PRBRESP_PROMISC)
 static void zd_op_configure_filter(struct ieee80211_hw *hw,
 			unsigned int changed_flags,
 			unsigned int *new_flags,
-			int mc_count, struct dev_mc_list *mclist)
+			u64 multicast)
 {
-	struct zd_mc_hash hash;
+	struct zd_mc_hash hash = {
+		.low = multicast,
+		.high = multicast >> 32,
+	};
 	struct zd_mac *mac = zd_hw_mac(hw);
 	unsigned long flags;
-	int i;
 
 	/* Only deal with supported flags */
 	changed_flags &= SUPPORTED_FIF_FLAGS;
@@ -819,25 +841,16 @@
 	if (!changed_flags)
 		return;
 
-	if (*new_flags & (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)) {
+	if (*new_flags & (FIF_PROMISC_IN_BSS | FIF_ALLMULTI))
 		zd_mc_add_all(&hash);
-	} else {
-		zd_mc_clear(&hash);
-		for (i = 0; i < mc_count; i++) {
-			if (!mclist)
-				break;
-			dev_dbg_f(zd_mac_dev(mac), "mc addr %pM\n",
-				  mclist->dmi_addr);
-			zd_mc_add_addr(&hash, mclist->dmi_addr);
-			mclist = mclist->next;
-		}
-	}
 
 	spin_lock_irqsave(&mac->lock, flags);
 	mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL);
 	mac->pass_ctrl = !!(*new_flags & FIF_CONTROL);
 	mac->multicast_hash = hash;
 	spin_unlock_irqrestore(&mac->lock, flags);
+
+	/* XXX: these can be called here now, can sleep now! */
 	queue_work(zd_workqueue, &mac->set_multicast_hash_work);
 
 	if (changed_flags & FIF_CONTROL)
@@ -940,6 +953,7 @@
 	.add_interface		= zd_op_add_interface,
 	.remove_interface	= zd_op_remove_interface,
 	.config			= zd_op_config,
+	.prepare_multicast	= zd_op_prepare_multicast,
 	.configure_filter	= zd_op_configure_filter,
 	.bss_info_changed	= zd_op_bss_info_changed,
 	.get_tsf		= zd_op_get_tsf,