rt2x00: Rename config_preamble() to config_erp()

Rename config_preamble() to config_erp() and cleanup argument
list by putting it all into a single structure.
This will make the function more meaningful and easier to
expand later. This second option is mostly intended to make
the patch "mac80211: proper short-slot handling" from Johannes Berg
easier to apply for rt2x00.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 8718ad3..a324ff3 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -384,7 +384,7 @@
 	 */
 	unsigned int delayed_flags;
 #define DELAYED_UPDATE_BEACON		0x00000001
-#define DELAYED_CONFIG_PREAMBLE		0x00000002
+#define DELAYED_CONFIG_ERP		0x00000002
 };
 
 static inline struct rt2x00_intf* vif_to_intf(struct ieee80211_vif *vif)
@@ -451,6 +451,16 @@
 };
 
 /*
+ * Configuration structure for erp settings.
+ */
+struct rt2x00lib_erp {
+	int short_preamble;
+
+	int ack_timeout;
+	int ack_consume_time;
+};
+
+/*
  * Configuration structure wrapper around the
  * rt2x00 interface configuration handler.
  */
@@ -558,10 +568,8 @@
 #define CONFIG_UPDATE_MAC		( 1 << 2 )
 #define CONFIG_UPDATE_BSSID		( 1 << 3 )
 
-	int (*config_preamble) (struct rt2x00_dev *rt2x00dev,
-				const int short_preamble,
-				const int ack_timeout,
-				const int ack_consume_time);
+	int (*config_erp) (struct rt2x00_dev *rt2x00dev,
+			   struct rt2x00lib_erp *erp);
 	void (*config) (struct rt2x00_dev *rt2x00dev,
 			struct rt2x00lib_conf *libconf,
 			const unsigned int flags);