[PATCH 3.19 41/75] iwlwifi: mvm: rs: fix BT Coex check to look at the correct ant

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eyal Shapira <eyal@wizery.com>

commit 57bff1485096c53f943e26b1c5847f2a9dfe84db upstream.

The check to avoid the shared antenna was passed the wrong
antenna parameter. It should have checked whether the antenna of
the next column we're considering is allowed and instead it was
passed the current antenna.
This could lead to a wrong choice of the next column in the rs
algorithm and non optimal performance.

Fixes: commit 219fb66b49fac64bb ("iwlwifi: mvm: rs - don't use the shared antenna when BT load is high")
Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/iwlwifi/mvm/rs.c |   21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

--- a/drivers/net/wireless/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/rs.c
@@ -146,9 +146,12 @@ enum rs_column_mode {
 #define MAX_NEXT_COLUMNS 7
 #define MAX_COLUMN_CHECKS 3
 
+struct rs_tx_column;
+
 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 				     struct ieee80211_sta *sta,
-				     struct iwl_scale_tbl_info *tbl);
+				     struct iwl_scale_tbl_info *tbl,
+				     const struct rs_tx_column *next_col);
 
 struct rs_tx_column {
 	enum rs_column_mode mode;
@@ -159,13 +162,15 @@ struct rs_tx_column {
 };
 
 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
-			 struct iwl_scale_tbl_info *tbl)
+			 struct iwl_scale_tbl_info *tbl,
+			 const struct rs_tx_column *next_col)
 {
-	return iwl_mvm_bt_coex_is_ant_avail(mvm, tbl->rate.ant);
+	return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 }
 
 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
-			  struct iwl_scale_tbl_info *tbl)
+			  struct iwl_scale_tbl_info *tbl,
+			  const struct rs_tx_column *next_col)
 {
 	if (!sta->ht_cap.ht_supported)
 		return false;
@@ -183,7 +188,8 @@ static bool rs_mimo_allow(struct iwl_mvm
 }
 
 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
-			  struct iwl_scale_tbl_info *tbl)
+			  struct iwl_scale_tbl_info *tbl,
+			  const struct rs_tx_column *next_col)
 {
 	if (!sta->ht_cap.ht_supported)
 		return false;
@@ -192,7 +198,8 @@ static bool rs_siso_allow(struct iwl_mvm
 }
 
 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
-			 struct iwl_scale_tbl_info *tbl)
+			 struct iwl_scale_tbl_info *tbl,
+			 const struct rs_tx_column *next_col)
 {
 	struct rs_rate *rate = &tbl->rate;
 	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
@@ -1594,7 +1601,7 @@ static enum rs_column rs_get_next_column
 
 		for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
 			allow_func = next_col->checks[j];
-			if (allow_func && !allow_func(mvm, sta, tbl))
+			if (allow_func && !allow_func(mvm, sta, tbl, next_col))
 				break;
 		}