linux-kernel - [PATCH 05/11] net: calxedaxgmac: update ring buffer tx

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Message-Id: <1377557126-10716-5-git-send-email-robherring2@gmail.com>
Date:	Mon, 26 Aug 2013 17:45:20 -0500
From:	Rob Herring <robherring2@...il.com>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Andreas Herrmann <andreas.herrmann@...xeda.com>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Rob Herring <rob.herring@...xeda.com>
Subject: [PATCH 05/11] net: calxedaxgmac: update ring buffer tx_head after barriers

From: Rob Herring <rob.herring@...xeda.com>

Ensure that the descriptor writes are visible before the ring buffer head
is updated. Since writel is a barrier, we can simply update the head after
the writel.

Reported-by: Lennert Buytenhek <buytenh@...tstofly.org>
Signed-off-by: Rob Herring <rob.herring@...xeda.com>
---
 drivers/net/ethernet/calxeda/xgmac.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 64854ad..f630855 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -1121,9 +1121,10 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
 	wmb();
 	desc_set_tx_owner(first, desc_flags | TXDESC_FIRST_SEG);
 
+	writel(1, priv->base + XGMAC_DMA_TX_POLL);
+
 	priv->tx_head = dma_ring_incr(entry, DMA_TX_RING_SZ);
 
-	writel(1, priv->base + XGMAC_DMA_TX_POLL);
 	if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) <
 	    MAX_SKB_FRAGS)
 		netif_stop_queue(dev);
-- 
1.8.1.2

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