iwlwifi: support "pure 40MHz" in RXON command

Fix the bug when using 11n "pure 40MHz" mode cause uCode
crashing by adding support for "pure 40MHz" in RX_ON command flag.
the "mode" field (bits 25:26) has value of 0-3
    0 = 20 MHz only
    1 = 40MHz only
    2 = Mixed
    3 = Reserved
Control Channel ID (bit 22) is valid only in Mixed mode.

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>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c
index 065214b55895..f6d4af5c7509 100644
--- a/drivers/net/wireless/iwlwifi/iwl-scan.c
+++ b/drivers/net/wireless/iwlwifi/iwl-scan.c
@@ -586,6 +586,7 @@ static void iwl_bg_request_scan(struct work_struct *data)
         u8 rx_ant = priv->hw_params.valid_rx_ant;
         u8 rate;
         bool is_active = false;
+        int  chan_mod;
 
         conf = ieee80211_get_hw_conf(priv->hw);
 
@@ -703,7 +704,9 @@ static void iwl_bg_request_scan(struct work_struct *data)
         if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
                 band = IEEE80211_BAND_2GHZ;
                 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
-                if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) {
+                chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
+                                       >> RXON_FLG_CHANNEL_MODE_POS;
+                if (chan_mod == CHANNEL_MODE_PURE_40) {
                         rate = IWL_RATE_6M_PLCP;
                 } else {
                         rate = IWL_RATE_1M_PLCP;