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Commit fd263fb6 authored by Shannon Nelson's avatar Shannon Nelson Committed by David S. Miller
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sunvnet: add memory barrier before check for tx enable 



In order to allow the underlying LDC and outstanding memory operations
to potentially catch up with the driver's Tx requests, add a memory
barrier before checking again for available tx descriptors.

Signed-off-by: default avatarShannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f2f3e210

drivers/net/ethernet/sun/sunvnet_common.c

+1 −0
Original line number Diff line number Diff line
@@ -1427,6 +1427,7 @@ int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev, 
	dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);

	if (unlikely(vnet_tx_dring_avail(dr) < 1)) {

		netif_tx_stop_queue(txq);

		smp_rmb();

		if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))

			netif_tx_wake_queue(txq);

	}