netdev - [PATCH] xen/netfront: remove unnecessary wmb

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Message-Id: <20181109065359.14900-1-jian.w.wen@oracle.com>
Date:   Fri,  9 Nov 2018 14:53:59 +0800
From:   Jacob Wen <jian.w.wen@...cle.com>
To:     netdev@...r.kernel.org
Cc:     jgross@...e.com, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...cle.com>
---
 drivers/net/xen-netfront.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index f17f602e6171..a8303afa15f1 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -337,8 +337,6 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
 		return;
 	}
 
-	wmb();		/* barrier so backend seens requests */
-
 	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify);
 	if (notify)
 		notify_remote_via_irq(queue->rx_irq);
-- 
2.17.1