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xen/netfront: remove unnecessary wmb 

RING_PUSH_REQUESTS_AND_CHECK_NOTIFY is already able to make sure backend sees
requests before req_prod is updated.

Signed-off-by: Jacob Wen <jian.w.wen@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jacob Wen 2018-11-09 14:53:59 +08:00 committed by David S. Miller
parent db8ba1e8c3
commit 307f39b021
1 changed files with 0 additions and 2 deletions
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2
drivers/net/xen-netfront.c
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@ -337,8 +337,6 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
return; return;
} }
wmb(); /* barrier so backend seens requests */
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify);
if (notify) if (notify)
notify_remote_via_irq(queue->rx_irq); notify_remote_via_irq(queue->rx_irq);