iwlwifi: check control channel for pure 40MHz

for pure 40MHz mode, set the control channel location if provided, but not
like Mixed mode; if information is not provided, still allow 40MHz
operation.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index b2875fe12561cc2e240be6a30c89d27c99c994fc..b122eedef3694f53658415114d27263b2e069097 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -826,9 +826,18 @@ void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_info *ht_info)
                         RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
        if (iwl_is_fat_tx_allowed(priv, NULL)) {
                /* pure 40 fat */
-               if (ht_info->ht_protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ)
+               if (ht_info->ht_protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
                        rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
-               else {
+                       /* Note: control channel is opposite of extension channel */
+                       switch (ht_info->extension_chan_offset) {
+                       case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
+                               rxon->flags &= ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
+                               break;
+                       case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
+                               rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
+                               break;
+                       }
+               } else {
                        /* Note: control channel is opposite of extension channel */
                        switch (ht_info->extension_chan_offset) {
                        case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: