iwlwifi: don't switch to SGI if not supported by AP

[~andy/linux] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965-rs.c b/drivers/net/wireless/iwlwifi/iwl-4965-rs.c
index 071c7b6ebef203c9e34b9f0bd822033f891916a1..2adc2281c77c75571a3bbe183a0835ac8fa97729 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-4965-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965-rs.c
@@ -1439,6 +1439,15 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
                        }
                        break;
                case IWL_SISO_SWITCH_GI:
+                       if (!tbl->is_fat &&
+                               !(priv->current_ht_config.sgf &
+                                               HT_SHORT_GI_20MHZ))
+                               break;
+                       if (tbl->is_fat &&
+                               !(priv->current_ht_config.sgf &
+                                               HT_SHORT_GI_40MHZ))
+                               break;
+
                        IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
 
                        memcpy(search_tbl, tbl, sz);
@@ -1521,6 +1530,15 @@ static int rs_move_mimo_to_other(struct iwl_priv *priv,
                        break;
 
                case IWL_MIMO_SWITCH_GI:
+                       if (!tbl->is_fat &&
+                               !(priv->current_ht_config.sgf &
+                                               HT_SHORT_GI_20MHZ))
+                               break;
+                       if (tbl->is_fat &&
+                               !(priv->current_ht_config.sgf &
+                                               HT_SHORT_GI_40MHZ))
+                               break;
+
                        IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
 
                        /* Set up new search table for MIMO */