iwlwifi: fix HT operation in 2.4 GHz band

When we cleaned up the driver to properly tell mac80211 about HT rates
("iwlwifi: use iwl_hwrate_get_mac80211_idx where appropriate"), we broke
internal rate indexing in 2.4 GHz band.

Signed-off-by: Daniel C Halperin <daniel.c.halperin@intel.com>
Tested-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, 6 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index 40b207aa8fef..fd731534df1c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -883,6 +883,12 @@ static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
                         mac_index++;
+                /*
+                 * mac80211 HT index is always zero-indexed; we need to move
+                 * HT OFDM rates after CCK rates in 2.4 GHz band
+                 */
+                if (priv->band == IEEE80211_BAND_2GHZ)
+                        mac_index += IWL_FIRST_OFDM_RATE;
         }
 
         if ((mac_index < 0) ||