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ll_temac: fix DMA resources leak 

V2: Check pointers before releasing resources.

Fix DMA resources leak.
Signed-off-by: Denis Kirjanov <dkirjanov@kernel.org>
Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
This commit is contained in:
Denis Kirjanov 2010-07-08 10:24:51 +00:00 committed by David S. Miller
parent 47562e5d32
commit 301e9d96bf
1 changed files with 32 additions and 0 deletions
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32
drivers/net/ll_temac_main.c
View File

@ -192,6 +192,35 @@ static int temac_dcr_setup(struct temac_local *lp, struct of_device *op,
#endif
/**
* * temac_dma_bd_release - Release buffer descriptor rings
*/
static void temac_dma_bd_release(struct net_device *ndev)
{
struct temac_local *lp = netdev_priv(ndev);
int i;
for (i = 0; i < RX_BD_NUM; i++) {
if (!lp->rx_skb[i])
break;
else {
dma_unmap_single(ndev->dev.parent, lp->rx_bd_v[i].phys,
XTE_MAX_JUMBO_FRAME_SIZE, DMA_FROM_DEVICE);
dev_kfree_skb(lp->rx_skb[i]);
}
}
if (lp->rx_bd_v)
dma_free_coherent(ndev->dev.parent,
sizeof(*lp->rx_bd_v) * RX_BD_NUM,
lp->rx_bd_v, lp->rx_bd_p);
if (lp->tx_bd_v)
dma_free_coherent(ndev->dev.parent,
sizeof(*lp->tx_bd_v) * TX_BD_NUM,
lp->tx_bd_v, lp->tx_bd_p);
if (lp->rx_skb)
kfree(lp->rx_skb);
}
/**
* temac_dma_bd_init - Setup buffer descriptor rings
*/
@ -275,6 +304,7 @@ static int temac_dma_bd_init(struct net_device *ndev)
return 0;
out:
temac_dma_bd_release(ndev);
return -ENOMEM;
}
@ -858,6 +888,8 @@ static int temac_stop(struct net_device *ndev)
phy_disconnect(lp->phy_dev);
lp->phy_dev = NULL;
temac_dma_bd_release(ndev);
return 0;
}