diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index a9b852b..1d9dcd7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -594,10 +594,11 @@ static void iwl3945_rx_reply_rx(struct iwl_priv *priv,
 
 	rx_status.flag = 0;
 	rx_status.mactime = le64_to_cpu(rx_end->timestamp);
-	rx_status.freq =
-		ieee80211_channel_to_frequency(le16_to_cpu(rx_hdr->channel));
 	rx_status.band = (rx_hdr->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
 				IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
+	rx_status.freq =
+		ieee80211_channel_to_frequency(le16_to_cpu(rx_hdr->channel),
+					       rx_status.band);
 
 	rx_status.rate_idx = iwl3945_hwrate_to_plcp_idx(rx_hdr->rate);
 	if (rx_status.band == IEEE80211_BAND_5GHZ)
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index 3dee87e..a800318 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -1157,10 +1157,11 @@ void iwlagn_rx_reply_rx(struct iwl_priv *priv,
 
 	/* rx_status carries information about the packet to mac80211 */
 	rx_status.mactime = le64_to_cpu(phy_res->timestamp);
-	rx_status.freq =
-		ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel));
 	rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
 				IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
+	rx_status.freq =
+		ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
+					       rx_status.band);
 	rx_status.rate_idx =
 		iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
 	rx_status.flag = 0;
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index efbde1f..a8d4a93 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -227,7 +227,8 @@ int iwlcore_init_geos(struct iwl_priv *priv)
 		geo_ch = &sband->channels[sband->n_channels++];
 
 		geo_ch->center_freq =
-				ieee80211_channel_to_frequency(ch->channel);
+				ieee80211_channel_to_frequency(ch->channel,
+							       sband->band);
 		geo_ch->max_power = ch->max_power_avg;
 		geo_ch->max_antenna_gain = 0xff;
 		geo_ch->hw_value = ch->channel;
diff --git a/drivers/net/wireless/iwmc3200wifi/cfg80211.c b/drivers/net/wireless/iwmc3200wifi/cfg80211.c
index 5a49822..ed57e44 100644
--- a/drivers/net/wireless/iwmc3200wifi/cfg80211.c
+++ b/drivers/net/wireless/iwmc3200wifi/cfg80211.c
@@ -287,7 +287,8 @@ int iwm_cfg80211_inform_bss(struct iwm_priv *iwm)
 			return -EINVAL;
 		}
 
-		freq = ieee80211_channel_to_frequency(umac_bss->channel);
+		freq = ieee80211_channel_to_frequency(umac_bss->channel,
+						      band->band);
 		channel = ieee80211_get_channel(wiphy, freq);
 		signal = umac_bss->rssi * 100;
 
diff --git a/drivers/net/wireless/iwmc3200wifi/rx.c b/drivers/net/wireless/iwmc3200wifi/rx.c
index a944893..9a57cf6 100644
--- a/drivers/net/wireless/iwmc3200wifi/rx.c
+++ b/drivers/net/wireless/iwmc3200wifi/rx.c
@@ -543,7 +543,10 @@ static int iwm_mlme_assoc_complete(struct iwm_priv *iwm, u8 *buf,
 	switch (le32_to_cpu(complete->status)) {
 	case UMAC_ASSOC_COMPLETE_SUCCESS:
 		chan = ieee80211_get_channel(wiphy,
-			ieee80211_channel_to_frequency(complete->channel));
+			ieee80211_channel_to_frequency(complete->channel,
+				complete->band == UMAC_BAND_2GHZ ?
+					IEEE80211_BAND_2GHZ :
+					IEEE80211_BAND_5GHZ));
 		if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) {
 			/* Associated to a unallowed channel, disassociate. */
 			__iwm_invalidate_mlme_profile(iwm);
@@ -841,7 +844,7 @@ static int iwm_mlme_update_bss_table(struct iwm_priv *iwm, u8 *buf,
 		goto err;
 	}
 
-	freq = ieee80211_channel_to_frequency(umac_bss->channel);
+	freq = ieee80211_channel_to_frequency(umac_bss->channel, band->band);
 	channel = ieee80211_get_channel(wiphy, freq);
 	signal = umac_bss->rssi * 100;
 
diff --git a/drivers/net/wireless/libertas/cfg.c b/drivers/net/wireless/libertas/cfg.c
index 698a1f7..30ef035 100644
--- a/drivers/net/wireless/libertas/cfg.c
+++ b/drivers/net/wireless/libertas/cfg.c
@@ -607,7 +607,8 @@ static int lbs_ret_scan(struct lbs_private *priv, unsigned long dummy,
 		/* No channel, no luck */
 		if (chan_no != -1) {
 			struct wiphy *wiphy = priv->wdev->wiphy;
-			int freq = ieee80211_channel_to_frequency(chan_no);
+			int freq = ieee80211_channel_to_frequency(chan_no,
+							IEEE80211_BAND_2GHZ);
 			struct ieee80211_channel *channel =
 				ieee80211_get_channel(wiphy, freq);
 
@@ -1597,7 +1598,8 @@ static int lbs_get_survey(struct wiphy *wiphy, struct net_device *dev,
 	lbs_deb_enter(LBS_DEB_CFG80211);
 
 	survey->channel = ieee80211_get_channel(wiphy,
-		ieee80211_channel_to_frequency(priv->channel));
+		ieee80211_channel_to_frequency(priv->channel,
+					       IEEE80211_BAND_2GHZ));
 
 	ret = lbs_get_rssi(priv, &signal, &noise);
 	if (ret == 0) {
diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index 809f2bf..b62f7ef 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -906,7 +906,8 @@ mwl8k_rxd_8366_ap_process(void *_rxd, struct ieee80211_rx_status *status,
 	} else {
 		status->band = IEEE80211_BAND_2GHZ;
 	}
-	status->freq = ieee80211_channel_to_frequency(rxd->channel);
+	status->freq = ieee80211_channel_to_frequency(rxd->channel,
+						      status->band);
 
 	*qos = rxd->qos_control;
 
@@ -1013,7 +1014,8 @@ mwl8k_rxd_sta_process(void *_rxd, struct ieee80211_rx_status *status,
 	} else {
 		status->band = IEEE80211_BAND_2GHZ;
 	}
-	status->freq = ieee80211_channel_to_frequency(rxd->channel);
+	status->freq = ieee80211_channel_to_frequency(rxd->channel,
+						      status->band);
 
 	*qos = rxd->qos_control;
 	if ((rxd->rx_ctrl & MWL8K_STA_RX_CTRL_DECRYPT_ERROR) &&
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 9597a03..31b7db0 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -649,7 +649,10 @@ static void rt2x00lib_channel(struct ieee80211_channel *entry,
 			      const int channel, const int tx_power,
 			      const int value)
 {
-	entry->center_freq = ieee80211_channel_to_frequency(channel);
+	/* XXX: this assumption about the band is wrong for 802.11j */
+	entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
+	entry->center_freq = ieee80211_channel_to_frequency(channel,
+							    entry->band);
 	entry->hw_value = value;
 	entry->max_power = tx_power;
 	entry->max_antenna_gain = 0xff;
diff --git a/drivers/net/wireless/wl1251/rx.c b/drivers/net/wireless/wl1251/rx.c
index efa5360..86eef45 100644
--- a/drivers/net/wireless/wl1251/rx.c
+++ b/drivers/net/wireless/wl1251/rx.c
@@ -78,7 +78,8 @@ static void wl1251_rx_status(struct wl1251 *wl,
 	 */
 	wl->noise = desc->rssi - desc->snr / 2;
 
-	status->freq = ieee80211_channel_to_frequency(desc->channel);
+	status->freq = ieee80211_channel_to_frequency(desc->channel,
+						      status->band);
 
 	status->flag |= RX_FLAG_TSFT;
 
diff --git a/drivers/net/wireless/wl12xx/rx.c b/drivers/net/wireless/wl12xx/rx.c
index 682304c..ec8d843 100644
--- a/drivers/net/wireless/wl12xx/rx.c
+++ b/drivers/net/wireless/wl12xx/rx.c
@@ -76,7 +76,7 @@ static void wl1271_rx_status(struct wl1271 *wl,
 	 */
 	wl->noise = desc->rssi - (desc->snr >> 1);
 
-	status->freq = ieee80211_channel_to_frequency(desc->channel);
+	status->freq = ieee80211_channel_to_frequency(desc->channel, desc_band);
 
 	if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
 		status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 1322695..679a049 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1790,8 +1790,9 @@ static inline void *wdev_priv(struct wireless_dev *wdev)
 /**
  * ieee80211_channel_to_frequency - convert channel number to frequency
  * @chan: channel number
+ * @band: band, necessary due to channel number overlap
  */
-extern int ieee80211_channel_to_frequency(int chan);
+extern int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band);
 
 /**
  * ieee80211_frequency_to_channel - convert frequency to channel number
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 53c7077..775fb63 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -270,7 +270,8 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 	enum ieee80211_band band = rx_status->band;
 
 	if (elems->ds_params && elems->ds_params_len == 1)
-		freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
+		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
+						      band);
 	else
 		freq = rx_status->freq;
 
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 2563fd1..2a57cc0 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -574,7 +574,7 @@ static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 			       &elems);
 
 	if (elems.ds_params && elems.ds_params_len == 1)
-		freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
+		freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 	else
 		freq = rx_status->freq;
 
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 45fbb9e..33bd6d4 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -176,7 +176,7 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 
 	/* check that channel matches the right operating channel */
 	if (local->hw.conf.channel->center_freq !=
-	    ieee80211_channel_to_frequency(hti->control_chan))
+	    ieee80211_channel_to_frequency(hti->control_chan, sband->band))
 		enable_ht = false;
 
 	if (enable_ht) {
@@ -429,7 +429,8 @@ void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 		container_of((void *)bss, struct cfg80211_bss, priv);
 	struct ieee80211_channel *new_ch;
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
-	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
+	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
+						      cbss->channel->band);
 
 	ASSERT_MGD_MTX(ifmgd);
 
@@ -1519,7 +1520,8 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 	}
 
 	if (elems->ds_params && elems->ds_params_len == 1)
-		freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
+		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
+						      rx_status->band);
 	else
 		freq = rx_status->freq;
 
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index fb274db..1ef73be 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -196,7 +196,8 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 	ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
 
 	if (elems.ds_params && elems.ds_params_len == 1)
-		freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
+		freq = ieee80211_channel_to_frequency(elems.ds_params[0],
+						      rx_status->band);
 	else
 		freq = rx_status->freq;
 
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 37693b6..c565689 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1801,9 +1801,9 @@ void regulatory_hint_disconnect(void)
 
 static bool freq_is_chan_12_13_14(u16 freq)
 {
-	if (freq == ieee80211_channel_to_frequency(12) ||
-	    freq == ieee80211_channel_to_frequency(13) ||
-	    freq == ieee80211_channel_to_frequency(14))
+	if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
+	    freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
+	    freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
 		return true;
 	return false;
 }
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 7620ae2..4ed065d 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -29,29 +29,37 @@ ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
 }
 EXPORT_SYMBOL(ieee80211_get_response_rate);
 
-int ieee80211_channel_to_frequency(int chan)
+int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
 {
-	if (chan < 14)
-		return 2407 + chan * 5;
-
-	if (chan == 14)
-		return 2484;
-
-	/* FIXME: 802.11j 17.3.8.3.2 */
-	return (chan + 1000) * 5;
+	/* see 802.11 17.3.8.3.2 and Annex J
+	 * there are overlapping channel numbers in 5GHz and 2GHz bands */
+	if (band == IEEE80211_BAND_5GHZ) {
+		if (chan >= 182 && chan <= 196)
+			return 4000 + chan * 5;
+		else
+			return 5000 + chan * 5;
+	} else { /* IEEE80211_BAND_2GHZ */
+		if (chan == 14)
+			return 2484;
+		else if (chan < 14)
+			return 2407 + chan * 5;
+		else
+			return 0; /* not supported */
+	}
 }
 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
 
 int ieee80211_frequency_to_channel(int freq)
 {
+	/* see 802.11 17.3.8.3.2 and Annex J */
 	if (freq == 2484)
 		return 14;
-
-	if (freq < 2484)
+	else if (freq < 2484)
 		return (freq - 2407) / 5;
-
-	/* FIXME: 802.11j 17.3.8.3.2 */
-	return freq/5 - 1000;
+	else if (freq >= 4910 && freq <= 4980)
+		return (freq - 4000) / 5;
+	else
+		return (freq - 5000) / 5;
 }
 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 3e5dbd4..7f1f4ec 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -267,9 +267,12 @@ int cfg80211_wext_freq(struct wiphy *wiphy, struct iw_freq *freq)
 	 * -EINVAL for impossible things.
 	 */
 	if (freq->e == 0) {
+		enum ieee80211_band band = IEEE80211_BAND_2GHZ;
 		if (freq->m < 0)
 			return 0;
-		return ieee80211_channel_to_frequency(freq->m);
+		if (freq->m > 14)
+			band = IEEE80211_BAND_5GHZ;
+		return ieee80211_channel_to_frequency(freq->m, band);
 	} else {
 		int i, div = 1000000;
 		for (i = 0; i < freq->e; i++)
