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net: sh_eth: fix up the buffer pointers 

After freeing the buffer, the driver should change the value of
the pointer to NULL.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yoshihiro Shimoda 2012-06-26 20:00:01 +00:00 committed by David S. Miller
parent 2ecbb783c3
commit 91c7755000
1 changed files with 24 additions and 7 deletions
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31
drivers/net/ethernet/renesas/sh_eth.c
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@ -788,6 +788,7 @@ static void sh_eth_ring_free(struct net_device *ndev)
}
}
kfree(mdp->rx_skbuff);
mdp->rx_skbuff = NULL;
/* Free Tx skb ringbuffer */
if (mdp->tx_skbuff) {
@ -797,6 +798,7 @@ static void sh_eth_ring_free(struct net_device *ndev)
}
}
kfree(mdp->tx_skbuff);
mdp->tx_skbuff = NULL;
}
/* format skb and descriptor buffer */
@ -933,10 +935,31 @@ desc_ring_free:
skb_ring_free:
/* Free Rx and Tx skb ring buffer */
sh_eth_ring_free(ndev);
mdp->tx_ring = NULL;
mdp->rx_ring = NULL;
return ret;
}
static void sh_eth_free_dma_buffer(struct sh_eth_private *mdp)
{
int ringsize;
if (mdp->rx_ring) {
ringsize = sizeof(struct sh_eth_rxdesc) * RX_RING_SIZE;
dma_free_coherent(NULL, ringsize, mdp->rx_ring,
mdp->rx_desc_dma);
mdp->rx_ring = NULL;
}
if (mdp->tx_ring) {
ringsize = sizeof(struct sh_eth_txdesc) * TX_RING_SIZE;
dma_free_coherent(NULL, ringsize, mdp->tx_ring,
mdp->tx_desc_dma);
mdp->tx_ring = NULL;
}
}
static int sh_eth_dev_init(struct net_device *ndev)
{
int ret = 0;
@ -1677,7 +1700,6 @@ static int sh_eth_start_xmit(struct sk_buff *skb, struct net_device *ndev)
static int sh_eth_close(struct net_device *ndev)
{
struct sh_eth_private *mdp = netdev_priv(ndev);
int ringsize;
netif_stop_queue(ndev);
@ -1700,12 +1722,7 @@ static int sh_eth_close(struct net_device *ndev)
sh_eth_ring_free(ndev);
/* free DMA buffer */
ringsize = sizeof(struct sh_eth_rxdesc) * RX_RING_SIZE;
dma_free_coherent(NULL, ringsize, mdp->rx_ring, mdp->rx_desc_dma);
/* free DMA buffer */
ringsize = sizeof(struct sh_eth_txdesc) * TX_RING_SIZE;
dma_free_coherent(NULL, ringsize, mdp->tx_ring, mdp->tx_desc_dma);
sh_eth_free_dma_buffer(mdp);
pm_runtime_put_sync(&mdp->pdev->dev);