gianfar: Simplify skb resources freeing code
Anton Vorontsov [Mon, 12 Oct 2009 06:00:30 +0000 (06:00 +0000)]
Remove dma_free_coherent() from stop_gfar() and gfar_start() calls,
place it into free_skb_resources(). That makes SKB resources management
more understandable, plus free_skb_resources() will be used as a cleanup
routine for gfar_alloc_skb_resources() that will be implemented soon.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/gianfar.c

index 5d6480c..a8b50c9 100644 (file)
@@ -806,7 +806,6 @@ void gfar_halt(struct net_device *dev)
 void stop_gfar(struct net_device *dev)
 {
        struct gfar_private *priv = netdev_priv(dev);
-       struct gfar __iomem *regs = priv->regs;
        unsigned long flags;
 
        phy_stop(priv->phydev);
@@ -830,18 +829,13 @@ void stop_gfar(struct net_device *dev)
        }
 
        free_skb_resources(priv);
-
-       dma_free_coherent(&priv->ofdev->dev,
-                       sizeof(struct txbd8)*priv->tx_ring_size
-                       + sizeof(struct rxbd8)*priv->rx_ring_size,
-                       priv->tx_bd_base,
-                       gfar_read(&regs->tbase0));
 }
 
 /* If there are any tx skbs or rx skbs still around, free them.
  * Then free tx_skbuff and rx_skbuff */
 static void free_skb_resources(struct gfar_private *priv)
 {
+       struct device *dev = &priv->ofdev->dev;
        struct rxbd8 *rxbdp;
        struct txbd8 *txbdp;
        int i, j;
@@ -849,6 +843,9 @@ static void free_skb_resources(struct gfar_private *priv)
        /* Go through all the buffer descriptors and free their data buffers */
        txbdp = priv->tx_bd_base;
 
+       if (!priv->tx_skbuff)
+               goto skip_tx_skbuff;
+
        for (i = 0; i < priv->tx_ring_size; i++) {
                if (!priv->tx_skbuff[i])
                        continue;
@@ -867,30 +864,33 @@ static void free_skb_resources(struct gfar_private *priv)
        }
 
        kfree(priv->tx_skbuff);
+skip_tx_skbuff:
 
        rxbdp = priv->rx_bd_base;
 
-       /* rx_skbuff is not guaranteed to be allocated, so only
-        * free it and its contents if it is allocated */
-       if(priv->rx_skbuff != NULL) {
-               for (i = 0; i < priv->rx_ring_size; i++) {
-                       if (priv->rx_skbuff[i]) {
-                               dma_unmap_single(&priv->ofdev->dev, rxbdp->bufPtr,
-                                               priv->rx_buffer_size,
-                                               DMA_FROM_DEVICE);
-
-                               dev_kfree_skb_any(priv->rx_skbuff[i]);
-                               priv->rx_skbuff[i] = NULL;
-                       }
-
-                       rxbdp->lstatus = 0;
-                       rxbdp->bufPtr = 0;
+       if (!priv->rx_skbuff)
+               goto skip_rx_skbuff;
 
-                       rxbdp++;
+       for (i = 0; i < priv->rx_ring_size; i++) {
+               if (priv->rx_skbuff[i]) {
+                       dma_unmap_single(&priv->ofdev->dev, rxbdp->bufPtr,
+                                        priv->rx_buffer_size,
+                                       DMA_FROM_DEVICE);
+                       dev_kfree_skb_any(priv->rx_skbuff[i]);
+                       priv->rx_skbuff[i] = NULL;
                }
 
-               kfree(priv->rx_skbuff);
+               rxbdp->lstatus = 0;
+               rxbdp->bufPtr = 0;
+               rxbdp++;
        }
+
+       kfree(priv->rx_skbuff);
+skip_rx_skbuff:
+
+       dma_free_coherent(dev, sizeof(*txbdp) * priv->tx_ring_size +
+                              sizeof(*rxbdp) * priv->rx_ring_size,
+                         priv->tx_bd_base, gfar_read(&priv->regs->tbase0));
 }
 
 void gfar_start(struct net_device *dev)
@@ -1148,11 +1148,8 @@ tx_irq_fail:
 err_irq_fail:
 err_rxalloc_fail:
 rx_skb_fail:
-       free_skb_resources(priv);
 tx_skb_fail:
-       dma_free_coherent(dev, sizeof(*txbdp) * priv->tx_ring_size +
-                              sizeof(*rxbdp) * priv->rx_ring_size,
-                         priv->tx_bd_base, gfar_read(&regs->tbase0));
+       free_skb_resources(priv);
        return err;
 }