From: françois romieu <romieu@fr.zoreil.com>
Date: Fri, 1 May 2015 20:14:44 +0000 (+0200)
Subject: via-rhine: dma_wmb transmit barrier.
X-Git-Tag: firefly_0821_release~176^2~1587^2~379^2~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e1efa87241272104d6a12c8b9fcdc4f62634d447;p=firefly-linux-kernel-4.4.55.git

via-rhine: dma_wmb transmit barrier.

Follow the now usual transmit descriptor update path:
1. content change
2. dma_wmb
3. ownership change

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c
index 8195fcdff8ab..86ca8b2f0895 100644
--- a/drivers/net/ethernet/via/via-rhine.c
+++ b/drivers/net/ethernet/via/via-rhine.c
@@ -1849,7 +1849,7 @@ static netdev_tx_t rhine_start_tx(struct sk_buff *skb,
 
 	netdev_sent_queue(dev, skb->len);
 	/* lock eth irq */
-	wmb();
+	dma_wmb();
 	rp->tx_ring[entry].tx_status |= cpu_to_le32(DescOwn);
 	wmb();