iwlwifi: fix default LQ table in 5.2 band

The default LQ is filled decreasingly using
iwl_get_prev_ieee_rate from a starting rate.
Since the starting rate is already the lowest one for
a specific band it should be actually filled evenly with
the starting rate: 1M and 6M for 5.2GHZ and 2.4GH respectively.
The bug is that for for A or G-only it decreases to
CCK rates which are not supported.
iwl_get_prev_ieee_rate function is just not band aware.
This affects broadcast station which lq table
is not updated by rs algorithm

G-only scenario is not treated by this patch

iwl_get_prev_ieee_rate is removed completely as it
is not used in other contexts

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

2 files changed, 8 insertions, 20 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.h b/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
index 3970ab1deaf9..357cdb26f16d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
@@ -453,15 +453,6 @@ static inline u8 first_antenna(u8 mask)
 }
 
 
-static inline u8 iwl_get_prev_ieee_rate(u8 rate_index)
-{
-        u8 rate = iwl_rates[rate_index].prev_ieee;
-
-        if (rate == IWL_RATE_INVALID)
-                rate = rate_index;
-        return rate;
-}
-
 static inline u8 iwl3945_get_prev_ieee_rate(u8 rate_index)
 {
         u8 rate = iwl3945_rates[rate_index].prev_ieee;
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index ccd09027c7cd..6edd0341dfe2 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -386,7 +386,8 @@ static struct iwl_link_quality_cmd *iwl_sta_alloc_lq(struct iwl_priv *priv,
 {
         int i, r;
         struct iwl_link_quality_cmd *link_cmd;
-        u32 rate_flags;
+        u32 rate_flags = 0;
+        __le32 rate_n_flags;
 
         link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
         if (!link_cmd) {
@@ -400,18 +401,14 @@ static struct iwl_link_quality_cmd *iwl_sta_alloc_lq(struct iwl_priv *priv,
         else
                 r = IWL_RATE_1M_INDEX;
 
-        for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
-                rate_flags = 0;
-                if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
-                        rate_flags |= RATE_MCS_CCK_MSK;
+        if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
+                rate_flags |= RATE_MCS_CCK_MSK;
 
-                rate_flags |= first_antenna(priv->hw_params.valid_tx_ant) <<
+        rate_flags |= first_antenna(priv->hw_params.valid_tx_ant) <<
                                 RATE_MCS_ANT_POS;
-
-                link_cmd->rs_table[i].rate_n_flags =
-                        iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
-                r = iwl_get_prev_ieee_rate(r);
-        }
+        rate_n_flags = iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
+        for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
+                link_cmd->rs_table[i].rate_n_flags = rate_n_flags;
 
         link_cmd->general_params.single_stream_ant_msk =
                                 first_antenna(priv->hw_params.valid_tx_ant);