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dwc_eth_qos: fix race condition in dwceqos_start_xmit

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The xmit handler and the tx_reclaim tasklet had a race on the tx_free
variable which could lead to a tx timeout if tx_free was updated after
the tx complete interrupt.

Signed-off-by: Rabin Vincent <rabinv@axis.com>
Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rabin Vincent 2016-02-29 16:22:30 +01:00 committed by David S. Miller
parent 11351bf762
commit 8afb6c474b
1 changed files with 2 additions and 4 deletions
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6
drivers/net/ethernet/synopsys/dwc_eth_qos.c
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@ -2178,12 +2178,10 @@ static int dwceqos_start_xmit(struct sk_buff *skb, struct net_device *ndev)
((trans.initial_descriptor + trans.nr_descriptors) %
DWCEQOS_TX_DCNT));
dwceqos_tx_finalize(skb, lp, &trans);
netdev_sent_queue(ndev, skb->len);
spin_lock_bh(&lp->tx_lock);
lp->tx_free -= trans.nr_descriptors;
dwceqos_tx_finalize(skb, lp, &trans);
netdev_sent_queue(ndev, skb->len);
spin_unlock_bh(&lp->tx_lock);
ndev->trans_start = jiffies;