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net: arc_emac: fix sk_buff leak

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EMAC could be disabled, while there is some sb_buff
in use. That buffers got lost for linux.

In order to reproduce run on device during active ethernet work:
    ifconfig eth0 down

Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Kochetkov 2016-02-09 18:20:40 +03:00 committed by David S. Miller
parent 99f93a156a
commit b530b16413
1 changed files with 62 additions and 0 deletions
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62
drivers/net/ethernet/arc/emac_main.c
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@ -517,6 +517,64 @@ static void arc_emac_set_rx_mode(struct net_device *ndev)
}
}
/**
* arc_free_tx_queue - free skb from tx queue
* @ndev: Pointer to the network device.
*
* This function must be called while EMAC disable
*/
static void arc_free_tx_queue(struct net_device *ndev)
{
struct arc_emac_priv *priv = netdev_priv(ndev);
unsigned int i;
for (i = 0; i < TX_BD_NUM; i++) {
struct arc_emac_bd *txbd = &priv->txbd[i];
struct buffer_state *tx_buff = &priv->tx_buff[i];
if (tx_buff->skb) {
dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
/* return the sk_buff to system */
dev_kfree_skb_irq(tx_buff->skb);
}
txbd->info = 0;
txbd->data = 0;
tx_buff->skb = NULL;
}
}
/**
* arc_free_rx_queue - free skb from rx queue
* @ndev: Pointer to the network device.
*
* This function must be called while EMAC disable
*/
static void arc_free_rx_queue(struct net_device *ndev)
{
struct arc_emac_priv *priv = netdev_priv(ndev);
unsigned int i;
for (i = 0; i < RX_BD_NUM; i++) {
struct arc_emac_bd *rxbd = &priv->rxbd[i];
struct buffer_state *rx_buff = &priv->rx_buff[i];
if (rx_buff->skb) {
dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
/* return the sk_buff to system */
dev_kfree_skb_irq(rx_buff->skb);
}
rxbd->info = 0;
rxbd->data = 0;
rx_buff->skb = NULL;
}
}
/**
* arc_emac_stop - Close the network device.
* @ndev: Pointer to the network device.
@ -538,6 +596,10 @@ static int arc_emac_stop(struct net_device *ndev)
/* Disable EMAC */
arc_reg_clr(priv, R_CTRL, EN_MASK);
/* Return the sk_buff to system */
arc_free_tx_queue(ndev);
arc_free_rx_queue(ndev);
return 0;
}