[PATCH] bcm43xx: Abstract the locking mechanism.

This is the starting point to make the driver out-of-order-MMIO-stores safe.
There are more mmiowb() needed.

Signed-off-by: Michael Buesch <mbuesch@freenet.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/bcm43xx/bcm43xx_pio.c

@@ -258,7 +258,7 @@ static void tx_tasklet(unsigned long d)
 	struct bcm43xx_pio_txpacket *packet, *tmp_packet;
 	int err;
 
-	spin_lock_irqsave(&bcm->lock, flags);
+	bcm43xx_lock_mmio(bcm, flags);
 	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
 		assert(packet->xmitted_frags < packet->txb->nr_frags);
 		if (packet->xmitted_frags == 0) {
@@ -288,7 +288,7 @@ static void tx_tasklet(unsigned long d)
 	next_packet:
 		continue;
 	}
-	spin_unlock_irqrestore(&bcm->lock, flags);
+	bcm43xx_unlock_mmio(bcm, flags);
 }
 
 static void setup_txqueues(struct bcm43xx_pioqueue *queue)