iwlwifi: fix 40MHz operation setting on cards that do not allow it

commit 6c3069b1e7e983e176a5f826e2edffefdd404a08 upstream.

Some devices have 40MHz operation disabled entirely. Ensure that driver do
not enable 40MHz operation if a channel does not allow this.

This fixes http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=2135

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.c b/drivers/net/wireless/iwlwifi/iwl-eeprom.c
index 622b636aefaec55dc13fca1b3f83d719c2d0771a..18dc3a4b794834205c64eaa51d8c2316a2acf16f 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-eeprom.c
+++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.c
@@ -711,7 +711,8 @@ static int iwl_mod_ht40_chan_info(struct iwl_priv *priv,
        ch_info->ht40_min_power = 0;
        ch_info->ht40_scan_power = eeprom_ch->max_power_avg;
        ch_info->ht40_flags = eeprom_ch->flags;
-       ch_info->ht40_extension_channel &= ~clear_ht40_extension_channel;
+       if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
+               ch_info->ht40_extension_channel &= ~clear_ht40_extension_channel;
 
        return 0;
 }