pasemi_mac: pass in count of buffers to replenish rx ring with

pasemi_mac: pass in count of buffers to replenish rx ring with

Refactor replenish_rx_ring to take an argument for how many entries to
fill. Since it's normally available from where it's called anyway, this
is just simpler. It also removes the awkward logic to try to figure out
if we're filling for the first time or not.
Signed-off-by: NOlof Johansson <olof@lixom.net>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/pasemi_mac.c

@@ -370,23 +370,18 @@ static void pasemi_mac_free_rx_resources(struct net_device *dev)
 	mac->rx = NULL;
 }
 
-static void pasemi_mac_replenish_rx_ring(struct net_device *dev)
+static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
 {
 	struct pasemi_mac *mac = netdev_priv(dev);
 	unsigned int i;
 	int start = mac->rx->next_to_fill;
-	unsigned int limit, count;
-
-	limit = RING_AVAIL(mac->rx);
-	/* Check to see if we're doing first-time setup */
-	if (unlikely(mac->rx->next_to_clean == 0 && mac->rx->next_to_fill == 0))
-		limit = RX_RING_SIZE;
+	int count;
 
 	if (limit <= 0)
 		return;
 
 	i = start;
-	for (count = limit; count; count--) {
+	for (count = 0; count < limit; count++) {
 		struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i);
 		u64 *buff = &RX_BUFF(mac, i);
 		struct sk_buff *skb;
@@ -417,10 +412,10 @@ static void pasemi_mac_replenish_rx_ring(struct net_device *dev)
 
 	wmb();
 
-	write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), limit - count);
-	write_dma_reg(mac, PAS_DMA_RXINT_INCR(mac->dma_if), limit - count);
+	write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), count);
+	write_dma_reg(mac, PAS_DMA_RXINT_INCR(mac->dma_if), count);
 
-	mac->rx->next_to_fill += limit - count;
+	mac->rx->next_to_fill += count;
 }
 
 static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
@@ -538,7 +533,7 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 	}
 
 	mac->rx->next_to_clean += limit - count;
-	pasemi_mac_replenish_rx_ring(mac->netdev);
+	pasemi_mac_replenish_rx_ring(mac->netdev, limit-count);
 
 	spin_unlock(&mac->rx->lock);
 
@@ -825,7 +820,7 @@ static int pasemi_mac_open(struct net_device *dev)
 	write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 			   PAS_DMA_TXCHAN_TCMDSTA_EN);
 
-	pasemi_mac_replenish_rx_ring(dev);
+	pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
 
 	flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 		PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;