rt2x00: Minor optimizazion in txdone path

We can save an indirect function call + some instructions for fetching
the actual function pointer by passing the driver specific txwi pointer
directly from rt2800pci/rt2800usb to rt2800lib instead of using the
rt2800_drv_get_txwi callback.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800lib.c

@@ -601,21 +601,19 @@ void rt2800_process_rxwi(struct queue_entry *entry,
 }
 EXPORT_SYMBOL_GPL(rt2800_process_rxwi);
 
-void rt2800_txdone_entry(struct queue_entry *entry, u32 status)
+void rt2800_txdone_entry(struct queue_entry *entry, u32 status, __le32 *txwi)
 {
 	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 	struct txdone_entry_desc txdesc;
 	u32 word;
 	u16 mcs, real_mcs;
 	int aggr, ampdu;
-	__le32 *txwi;
 
 	/*
 	 * Obtain the status about this packet.
 	 */
 	txdesc.flags = 0;
-	txwi = rt2800_drv_get_txwi(entry);
 	rt2x00_desc_read(txwi, 0, &word);
 
 	mcs = rt2x00_get_field32(word, TXWI_W0_MCS);

drivers/net/wireless/rt2x00/rt2800lib.h

@@ -152,7 +152,7 @@ void rt2800_write_tx_data(struct queue_entry *entry,
 			  struct txentry_desc *txdesc);
 void rt2800_process_rxwi(struct queue_entry *entry, struct rxdone_entry_desc *txdesc);
 
-void rt2800_txdone_entry(struct queue_entry *entry, u32 status);
+void rt2800_txdone_entry(struct queue_entry *entry, u32 status, __le32* txwi);
 
 void rt2800_write_beacon(struct queue_entry *entry, struct txentry_desc *txdesc);
 void rt2800_clear_beacon(struct queue_entry *entry);

drivers/net/wireless/rt2x00/rt2800pci.c

@@ -760,7 +760,7 @@ static bool rt2800pci_txdone(struct rt2x00_dev *rt2x00dev)
 		}
 
 		entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
-		rt2800_txdone_entry(entry, status);
+		rt2800_txdone_entry(entry, status, rt2800pci_get_txwi(entry));
 
 		if (--max_tx_done == 0)
 			break;

drivers/net/wireless/rt2x00/rt2800usb.c

@@ -534,7 +534,8 @@ static void rt2800usb_txdone(struct rt2x00_dev *rt2x00dev)
 		if (!entry || rt2x00queue_empty(queue))
 			break;
 
-		rt2800_txdone_entry(entry, reg);
+		rt2800_txdone_entry(entry, reg,
+				    rt2800usb_get_txwi(entry));
 	}
 }