802.11: clean up/fix HT support

This patch cleans up a number of things:
 * the unusable definition of the HT capabilities/HT information
   information elements
 * variable names that are hard to understand
 * mac80211: move ieee80211_handle_ht to ht.c and remove the unused
             enable_ht parameter
 * mac80211: fix bug with MCS rate 32 in ieee80211_handle_ht
 * mac80211: fix bug with casting the result of ieee80211_bss_get_ie
             to an information element _contents_ rather than the
             whole element, add size checking (another out-of-bounds
             access bug fixed!)
 * mac80211: remove some unused return values in favour of BUG_ON
             checking
 * a few minor other things

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

7 files changed, 67 insertions, 66 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index b497d40dc396..cd1bff590491 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -1134,10 +1134,10 @@ static int rs_switch_to_mimo2(struct iwl_priv *priv,
         s8 is_green = lq_sta->is_green;
 
         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
-            !sta->ht_info.ht_supported)
+            !sta->ht_cap.ht_supported)
                 return -1;
 
-        if (((sta->ht_info.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
+        if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
                                                 == WLAN_HT_CAP_SM_PS_STATIC)
                 return -1;
 
@@ -1202,7 +1202,7 @@ static int rs_switch_to_siso(struct iwl_priv *priv,
         s32 rate;
 
         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
-            !sta->ht_info.ht_supported)
+            !sta->ht_cap.ht_supported)
                 return -1;
 
         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
@@ -2238,19 +2238,19 @@ static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
          * supp_rates[] does not; shift to convert format, force 9 MBits off.
          */
-        lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
-        lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
+        lq_sta->active_siso_rate = conf->ht_cap.mcs.rx_mask[0] << 1;
+        lq_sta->active_siso_rate |= conf->ht_cap.mcs.rx_mask[0] & 0x1;
         lq_sta->active_siso_rate &= ~((u16)0x2);
         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
 
         /* Same here */
-        lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
-        lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
+        lq_sta->active_mimo2_rate = conf->ht_cap.mcs.rx_mask[1] << 1;
+        lq_sta->active_mimo2_rate |= conf->ht_cap.mcs.rx_mask[1] & 0x1;
         lq_sta->active_mimo2_rate &= ~((u16)0x2);
         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
 
-        lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
-        lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
+        lq_sta->active_mimo3_rate = conf->ht_cap.mcs.rx_mask[2] << 1;
+        lq_sta->active_mimo3_rate |= conf->ht_cap.mcs.rx_mask[2] & 0x1;
         lq_sta->active_mimo3_rate &= ~((u16)0x2);
         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 2cac09405afe..e6695e80fb53 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -552,7 +552,7 @@ static int iwl4965_send_beacon_cmd(struct iwl_priv *priv)
 static void iwl4965_ht_conf(struct iwl_priv *priv,
                             struct ieee80211_bss_conf *bss_conf)
 {
-        struct ieee80211_ht_info *ht_conf = bss_conf->ht_conf;
+        struct ieee80211_sta_ht_cap *ht_conf = bss_conf->ht_cap;
         struct ieee80211_ht_bss_info *ht_bss_conf = bss_conf->ht_bss_conf;
         struct iwl_ht_info *iwl_conf = &priv->current_ht_config;
 
@@ -573,27 +573,27 @@ static void iwl4965_ht_conf(struct iwl_priv *priv,
                 !!(ht_conf->cap & IEEE80211_HT_CAP_MAX_AMSDU);
 
         iwl_conf->supported_chan_width =
-                !!(ht_conf->cap & IEEE80211_HT_CAP_SUP_WIDTH);
+                !!(ht_conf->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40);
         iwl_conf->extension_chan_offset =
-                ht_bss_conf->bss_cap & IEEE80211_HT_IE_CHA_SEC_OFFSET;
+                ht_bss_conf->bss_cap & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
         /* If no above or below channel supplied disable FAT channel */
-        if (iwl_conf->extension_chan_offset != IEEE80211_HT_IE_CHA_SEC_ABOVE &&
-            iwl_conf->extension_chan_offset != IEEE80211_HT_IE_CHA_SEC_BELOW) {
-                iwl_conf->extension_chan_offset = IEEE80211_HT_IE_CHA_SEC_NONE;
+        if (iwl_conf->extension_chan_offset != IEEE80211_HT_PARAM_CHA_SEC_ABOVE &&
+            iwl_conf->extension_chan_offset != IEEE80211_HT_PARAM_CHA_SEC_BELOW) {
+                iwl_conf->extension_chan_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
                 iwl_conf->supported_chan_width = 0;
         }
 
         iwl_conf->sm_ps = (u8)((ht_conf->cap & IEEE80211_HT_CAP_SM_PS) >> 2);
 
-        memcpy(iwl_conf->supp_mcs_set, ht_conf->supp_mcs_set, 16);
+        memcpy(&iwl_conf->mcs, &ht_conf->mcs, 16);
 
         iwl_conf->control_channel = ht_bss_conf->primary_channel;
         iwl_conf->tx_chan_width =
-                !!(ht_bss_conf->bss_cap & IEEE80211_HT_IE_CHA_WIDTH);
+                !!(ht_bss_conf->bss_cap & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY);
         iwl_conf->ht_protection =
-                ht_bss_conf->bss_op_mode & IEEE80211_HT_IE_HT_PROTECTION;
+                ht_bss_conf->bss_op_mode & IEEE80211_HT_OP_MODE_PROTECTION;
         iwl_conf->non_GF_STA_present =
-                !!(ht_bss_conf->bss_op_mode & IEEE80211_HT_IE_NON_GF_STA_PRSNT);
+                !!(ht_bss_conf->bss_op_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 
         IWL_DEBUG_MAC80211("control channel %d\n", iwl_conf->control_channel);
         IWL_DEBUG_MAC80211("leave\n");
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index 4c312c55f90c..4678da447ff6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -382,10 +382,10 @@ void iwl_reset_qos(struct iwl_priv *priv)
 }
 EXPORT_SYMBOL(iwl_reset_qos);
 
-#define MAX_BIT_RATE_40_MHZ 0x96 /* 150 Mbps */
-#define MAX_BIT_RATE_20_MHZ 0x48 /* 72 Mbps */
+#define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
+#define MAX_BIT_RATE_20_MHZ 72 /* Mbps */
 static void iwlcore_init_ht_hw_capab(const struct iwl_priv *priv,
-                              struct ieee80211_ht_info *ht_info,
+                              struct ieee80211_sta_ht_cap *ht_info,
                               enum ieee80211_band band)
 {
         u16 max_bit_rate = 0;
@@ -393,45 +393,46 @@ static void iwlcore_init_ht_hw_capab(const struct iwl_priv *priv,
         u8 tx_chains_num = priv->hw_params.tx_chains_num;
 
         ht_info->cap = 0;
-        memset(ht_info->supp_mcs_set, 0, 16);
+        memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
 
-        ht_info->ht_supported = 1;
+        ht_info->ht_supported = true;
 
-        ht_info->cap |= (u16)IEEE80211_HT_CAP_GRN_FLD;
-        ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_20;
-        ht_info->cap |= (u16)(IEEE80211_HT_CAP_SM_PS &
+        ht_info->cap |= IEEE80211_HT_CAP_GRN_FLD;
+        ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
+        ht_info->cap |= (IEEE80211_HT_CAP_SM_PS &
                              (WLAN_HT_CAP_SM_PS_DISABLED << 2));
 
         max_bit_rate = MAX_BIT_RATE_20_MHZ;
         if (priv->hw_params.fat_channel & BIT(band)) {
-                ht_info->cap |= (u16)IEEE80211_HT_CAP_SUP_WIDTH;
-                ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_40;
-                ht_info->supp_mcs_set[4] = 0x01;
+                ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+                ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
+                ht_info->mcs.rx_mask[4] = 0x01;
                 max_bit_rate = MAX_BIT_RATE_40_MHZ;
         }
 
         if (priv->cfg->mod_params->amsdu_size_8K)
-                ht_info->cap |= (u16)IEEE80211_HT_CAP_MAX_AMSDU;
+                ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
 
         ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
         ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
 
-        ht_info->supp_mcs_set[0] = 0xFF;
+        ht_info->mcs.rx_mask[0] = 0xFF;
         if (rx_chains_num >= 2)
-                ht_info->supp_mcs_set[1] = 0xFF;
+                ht_info->mcs.rx_mask[1] = 0xFF;
         if (rx_chains_num >= 3)
-                ht_info->supp_mcs_set[2] = 0xFF;
+                ht_info->mcs.rx_mask[2] = 0xFF;
 
         /* Highest supported Rx data rate */
         max_bit_rate *= rx_chains_num;
-        ht_info->supp_mcs_set[10] = (u8)(max_bit_rate & 0x00FF);
-        ht_info->supp_mcs_set[11] = (u8)((max_bit_rate & 0xFF00) >> 8);
+        WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
+        ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);
 
         /* Tx MCS capabilities */
-        ht_info->supp_mcs_set[12] = IEEE80211_HT_CAP_MCS_TX_DEFINED;
+        ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
         if (tx_chains_num != rx_chains_num) {
-                ht_info->supp_mcs_set[12] |= IEEE80211_HT_CAP_MCS_TX_RX_DIFF;
-                ht_info->supp_mcs_set[12] |= ((tx_chains_num - 1) << 2);
+                ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
+                ht_info->mcs.tx_params |= ((tx_chains_num - 1) <<
+                                IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
         }
 }
 
@@ -495,7 +496,7 @@ static int iwlcore_init_geos(struct iwl_priv *priv)
         sband->n_bitrates = IWL_RATE_COUNT - IWL_FIRST_OFDM_RATE;
 
         if (priv->cfg->sku & IWL_SKU_N)
-                iwlcore_init_ht_hw_capab(priv, &sband->ht_info,
+                iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
                                          IEEE80211_BAND_5GHZ);
 
         sband = &priv->bands[IEEE80211_BAND_2GHZ];
@@ -505,7 +506,7 @@ static int iwlcore_init_geos(struct iwl_priv *priv)
         sband->n_bitrates = IWL_RATE_COUNT;
 
         if (priv->cfg->sku & IWL_SKU_N)
-                iwlcore_init_ht_hw_capab(priv, &sband->ht_info,
+                iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
                                          IEEE80211_BAND_2GHZ);
 
         priv->ieee_channels = channels;
@@ -595,8 +596,8 @@ static void iwlcore_free_geos(struct iwl_priv *priv)
 static bool is_single_rx_stream(struct iwl_priv *priv)
 {
         return !priv->current_ht_config.is_ht ||
-               ((priv->current_ht_config.supp_mcs_set[1] == 0) &&
-                (priv->current_ht_config.supp_mcs_set[2] == 0));
+               ((priv->current_ht_config.mcs.rx_mask[1] == 0) &&
+                (priv->current_ht_config.mcs.rx_mask[2] == 0));
 }
 
 static u8 iwl_is_channel_extension(struct iwl_priv *priv,
@@ -609,10 +610,10 @@ static u8 iwl_is_channel_extension(struct iwl_priv *priv,
         if (!is_channel_valid(ch_info))
                 return 0;
 
-        if (extension_chan_offset == IEEE80211_HT_IE_CHA_SEC_ABOVE)
+        if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
                 return !(ch_info->fat_extension_channel &
                                         IEEE80211_CHAN_NO_FAT_ABOVE);
-        else if (extension_chan_offset == IEEE80211_HT_IE_CHA_SEC_BELOW)
+        else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
                 return !(ch_info->fat_extension_channel &
                                         IEEE80211_CHAN_NO_FAT_BELOW);
 
@@ -620,18 +621,18 @@ static u8 iwl_is_channel_extension(struct iwl_priv *priv,
 }
 
 u8 iwl_is_fat_tx_allowed(struct iwl_priv *priv,
-                             struct ieee80211_ht_info *sta_ht_inf)
+                         struct ieee80211_sta_ht_cap *sta_ht_inf)
 {
         struct iwl_ht_info *iwl_ht_conf = &priv->current_ht_config;
 
         if ((!iwl_ht_conf->is_ht) ||
            (iwl_ht_conf->supported_chan_width != IWL_CHANNEL_WIDTH_40MHZ) ||
-           (iwl_ht_conf->extension_chan_offset == IEEE80211_HT_IE_CHA_SEC_NONE))
+           (iwl_ht_conf->extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_NONE))
                 return 0;
 
         if (sta_ht_inf) {
                 if ((!sta_ht_inf->ht_supported) ||
-                   (!(sta_ht_inf->cap & IEEE80211_HT_CAP_SUP_WIDTH)))
+                   (!(sta_ht_inf->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)))
                         return 0;
         }
 
@@ -671,13 +672,13 @@ void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_info *ht_info)
 
         /* Note: control channel is opposite of extension channel */
         switch (ht_info->extension_chan_offset) {
-        case IEEE80211_HT_IE_CHA_SEC_ABOVE:
+        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                 rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
                 break;
-        case IEEE80211_HT_IE_CHA_SEC_BELOW:
+        case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
                 break;
-        case IEEE80211_HT_IE_CHA_SEC_NONE:
+        case IEEE80211_HT_PARAM_CHA_SEC_NONE:
         default:
                 rxon->flags &= ~RXON_FLG_CHANNEL_MODE_MIXED_MSK;
                 break;
@@ -693,9 +694,9 @@ void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_info *ht_info)
                         "rxon flags 0x%X operation mode :0x%X "
                         "extension channel offset 0x%x "
                         "control chan %d\n",
-                        ht_info->supp_mcs_set[0],
-                        ht_info->supp_mcs_set[1],
-                        ht_info->supp_mcs_set[2],
+                        ht_info->mcs.rx_mask[0],
+                        ht_info->mcs.rx_mask[1],
+                        ht_info->mcs.rx_mask[2],
                         le32_to_cpu(rxon->flags), ht_info->ht_protection,
                         ht_info->extension_chan_offset,
                         ht_info->control_channel);
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 288b6a800e03..1a3ad8b1ebdb 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -190,7 +190,7 @@ void iwl_set_rxon_chain(struct iwl_priv *priv);
 int iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch);
 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_info *ht_info);
 u8 iwl_is_fat_tx_allowed(struct iwl_priv *priv,
-                         struct ieee80211_ht_info *sta_ht_inf);
+                         struct ieee80211_sta_ht_cap *sta_ht_inf);
 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/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 34306b6798e2..572250ee9d58 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -411,7 +411,7 @@ struct iwl_ht_info {
         u8 max_amsdu_size;
         u8 ampdu_factor;
         u8 mpdu_density;
-        u8 supp_mcs_set[16];
+        struct ieee80211_mcs_info mcs;
         /* BSS related data */
         u8 control_channel;
         u8 extension_chan_offset;
@@ -585,7 +585,7 @@ struct iwl_addsta_cmd;
 extern int iwl_send_add_sta(struct iwl_priv *priv,
                             struct iwl_addsta_cmd *sta, u8 flags);
 extern u8 iwl_add_station_flags(struct iwl_priv *priv, const u8 *addr,
-                        int is_ap, u8 flags, struct ieee80211_ht_info *ht_info);
+                        int is_ap, u8 flags, struct ieee80211_sta_ht_cap *ht_info);
 extern void iwl4965_update_chain_flags(struct iwl_priv *priv);
 extern int iwl4965_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src);
 extern const u8 iwl_bcast_addr[ETH_ALEN];
diff --git a/drivers/net/wireless/iwlwifi/iwl-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c
index 3b0bee331a33..78d16bd7b745 100644
--- a/drivers/net/wireless/iwlwifi/iwl-scan.c
+++ b/drivers/net/wireless/iwlwifi/iwl-scan.c
@@ -550,7 +550,7 @@ static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
 {
         struct ieee80211_ht_cap *ht_cap;
 
-        if (!sband || !sband->ht_info.ht_supported)
+        if (!sband || !sband->ht_cap.ht_supported)
                 return;
 
         if (*left < sizeof(struct ieee80211_ht_cap))
@@ -559,12 +559,12 @@ static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
         *pos++ = sizeof(struct ieee80211_ht_cap);
         ht_cap = (struct ieee80211_ht_cap *) pos;
 
-        ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
-        memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
+        ht_cap->cap_info = cpu_to_le16(sband->ht_cap.cap);
+        memcpy(&ht_cap->mcs, &sband->ht_cap.mcs, 16);
         ht_cap->ampdu_params_info =
-                (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
-                ((sband->ht_info.ampdu_density << 2) &
-                        IEEE80211_HT_CAP_AMPDU_DENSITY);
+                (sband->ht_cap.ampdu_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) |
+                ((sband->ht_cap.ampdu_density << 2) &
+                        IEEE80211_HT_AMPDU_PARM_DENSITY);
         *left -= sizeof(struct ieee80211_ht_cap);
 }
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index a28a8decc79c..b9b8554433a6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -181,7 +181,7 @@ int iwl_send_add_sta(struct iwl_priv *priv,
 EXPORT_SYMBOL(iwl_send_add_sta);
 
 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
-                                   struct ieee80211_ht_info *sta_ht_inf)
+                                   struct ieee80211_sta_ht_cap *sta_ht_inf)
 {
         __le32 sta_flags;
         u8 mimo_ps_mode;
@@ -229,7 +229,7 @@ static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
  * iwl_add_station_flags - Add station to tables in driver and device
  */
 u8 iwl_add_station_flags(struct iwl_priv *priv, const u8 *addr, int is_ap,
-                         u8 flags, struct ieee80211_ht_info *ht_info)
+                         u8 flags, struct ieee80211_sta_ht_cap *ht_info)
 {
         int i;
         int sta_id = IWL_INVALID_STATION;
@@ -894,7 +894,7 @@ int iwl_rxon_add_station(struct iwl_priv *priv, const u8 *addr, int is_ap)
 
         /* Add station to device's station table */
         struct ieee80211_conf *conf = &priv->hw->conf;
-        struct ieee80211_ht_info *cur_ht_config = &conf->ht_conf;
+        struct ieee80211_sta_ht_cap *cur_ht_config = &conf->ht_cap;
 
         if ((is_ap) &&
             (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&