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net/temac: FIX segfault when process old irqs 

Do not enable the irq until the scatter gather registers are ready to
handle the data. Otherwise an irq from a packet send/received before
last close can lead to an access to an invalid memory region on the irq
handler.

Also, stop the dma engine on close.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ricardo Ribalda 2011-11-07 23:31:58 +00:00 committed by David S. Miller
parent 2bc8ca40f9
commit 50ec1538fa
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/xilinx/ll_temac_main.c
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@ -203,6 +203,9 @@ static void temac_dma_bd_release(struct net_device *ndev)
struct temac_local *lp = netdev_priv(ndev);
int i;
/* Reset Local Link (DMA) */
lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
for (i = 0; i < RX_BD_NUM; i++) {
if (!lp->rx_skb[i])
break;
@ -860,6 +863,8 @@ static int temac_open(struct net_device *ndev)
phy_start(lp->phy_dev);
}
temac_device_reset(ndev);
rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev);
if (rc)
goto err_tx_irq;
@ -867,7 +872,6 @@ static int temac_open(struct net_device *ndev)
if (rc)
goto err_rx_irq;
temac_device_reset(ndev);
return 0;
err_rx_irq: