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/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index f912a85..99f18d4 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -366,20 +366,18 @@
 	}
 }
 
-static int rt61pci_config_preamble(struct rt2x00_dev *rt2x00dev,
-				   const int short_preamble,
-				   const int ack_timeout,
-				   const int ack_consume_time)
+static int rt61pci_config_erp(struct rt2x00_dev *rt2x00dev,
+			      struct rt2x00lib_erp *erp)
 {
 	u32 reg;
 
 	rt2x00pci_register_read(rt2x00dev, TXRX_CSR0, &reg);
-	rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, ack_timeout);
+	rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, erp->ack_timeout);
 	rt2x00pci_register_write(rt2x00dev, TXRX_CSR0, reg);
 
 	rt2x00pci_register_read(rt2x00dev, TXRX_CSR4, &reg);
 	rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_PREAMBLE,
-			   !!short_preamble);
+			   !!erp->short_preamble);
 	rt2x00pci_register_write(rt2x00dev, TXRX_CSR4, reg);
 
 	return 0;
@@ -2481,7 +2479,7 @@
 	.kick_tx_queue		= rt61pci_kick_tx_queue,
 	.fill_rxdone		= rt61pci_fill_rxdone,
 	.config_intf		= rt61pci_config_intf,
-	.config_preamble	= rt61pci_config_preamble,
+	.config_erp		= rt61pci_config_erp,
 	.config			= rt61pci_config,
 };