iwlagn: use per-vif AC parameters

Eliad added the ability to configure AC parameters
per virtual interface; make use of this in iwlwifi
and set the parameters in the right context. Since
storage and uploading to the device is already per
context, this is sufficient.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-core.c

@@ -1125,10 +1125,14 @@ int iwlagn_mac_conf_tx(struct ieee80211_hw *hw,
 		    const struct ieee80211_tx_queue_params *params)
 {
 	struct iwl_priv *priv = hw->priv;
-	struct iwl_rxon_context *ctx;
+	struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
+	struct iwl_rxon_context *ctx = vif_priv->ctx;
 	unsigned long flags;
 	int q;
 
+	if (WARN_ON(!ctx))
+		return -EINVAL;
+
 	IWL_DEBUG_MAC80211(priv, "enter\n");
 
 	if (!iwl_is_ready_rf(priv->shrd)) {
@@ -1145,11 +1149,6 @@ int iwlagn_mac_conf_tx(struct ieee80211_hw *hw,
 
 	spin_lock_irqsave(&priv->shrd->lock, flags);
 
-	/*
-	 * MULTI-FIXME
-	 * This may need to be done per interface in nl80211/cfg80211/mac80211.
-	 */
-	for_each_context(priv, ctx) {
 	ctx->qos_data.def_qos_parm.ac[q].cw_min =
 		cpu_to_le16(params->cw_min);
 	ctx->qos_data.def_qos_parm.ac[q].cw_max =
@@ -1159,7 +1158,6 @@ int iwlagn_mac_conf_tx(struct ieee80211_hw *hw,
 			cpu_to_le16((params->txop * 32));
 
 	ctx->qos_data.def_qos_parm.ac[q].reserved1 = 0;
-	}
 
 	spin_unlock_irqrestore(&priv->shrd->lock, flags);