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/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 7ea4247..43da93a 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -356,10 +356,8 @@
 					      (3 * sizeof(__le16)));
 }
 
-static int rt2500usb_config_preamble(struct rt2x00_dev *rt2x00dev,
-				     const int short_preamble,
-				     const int ack_timeout,
-				     const int ack_consume_time)
+static int rt2500usb_config_erp(struct rt2x00_dev *rt2x00dev,
+				struct rt2x00lib_erp *erp)
 {
 	u16 reg;
 
@@ -371,12 +369,12 @@
 		return -EAGAIN;
 
 	rt2500usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
-	rt2x00_set_field16(&reg, TXRX_CSR1_ACK_TIMEOUT, ack_timeout);
+	rt2x00_set_field16(&reg, TXRX_CSR1_ACK_TIMEOUT, erp->ack_timeout);
 	rt2500usb_register_write(rt2x00dev, TXRX_CSR1, reg);
 
 	rt2500usb_register_read(rt2x00dev, TXRX_CSR10, &reg);
 	rt2x00_set_field16(&reg, TXRX_CSR10_AUTORESPOND_PREAMBLE,
-			   !!short_preamble);
+			   !!erp->short_preamble);
 	rt2500usb_register_write(rt2x00dev, TXRX_CSR10, reg);
 
 	return 0;
@@ -1842,7 +1840,7 @@
 	.kick_tx_queue		= rt2500usb_kick_tx_queue,
 	.fill_rxdone		= rt2500usb_fill_rxdone,
 	.config_intf		= rt2500usb_config_intf,
-	.config_preamble	= rt2500usb_config_preamble,
+	.config_erp		= rt2500usb_config_erp,
 	.config			= rt2500usb_config,
 };