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qlcnic: add wmb() call in transmit data path.

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Call wmb() to ensure writes are complete before
hardware fetches updated Tx descriptors.

Signed-off-by: Sony Chacko <sony.chacko@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sony Chacko 2016-06-29 17:51:34 -04:00 committed by David S. Miller
parent 43daa96b16
commit 9216a97a12
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
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@ -772,6 +772,8 @@ netdev_tx_t qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
tx_ring->tx_stats.tx_bytes += skb->len;
tx_ring->tx_stats.xmit_called++;
/* Ensure writes are complete before HW fetches Tx descriptors */
wmb();
qlcnic_update_cmd_producer(tx_ring);
return NETDEV_TX_OK;