linux-kernel - [PATCH] 8139too: move wmb before TX DMA start

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Message-ID: <48EC64E1.5070806@linuxtv.org>
Date:	Wed, 08 Oct 2008 09:44:33 +0200
From:	Andreas Oberritter <obi@...uxtv.org>
To:	Jeff Garzik <jgarzik@...ox.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] 8139too: move wmb before TX DMA start

From: Andreas Oberritter <obi@...uxtv.org>

The write barrier should be used before starting a DMA transfer. This fixes
a problem, where almost all packets received on another machine had garbled
content. Tested with an RTL8100C on a MIPS machine.

Signed-off-by: Andreas Oberritter <obi@...uxtv.org>

diff --git a/drivers/net/8139too.c b/drivers/net/8139too.c
index 53bd903..44344af 100644
--- a/drivers/net/8139too.c
+++ b/drivers/net/8139too.c
@@ -1716,13 +1716,13 @@ static int rtl8139_start_xmit (struct sk_buff *skb, struct net_device *dev)
 	}
 
 	spin_lock_irqsave(&tp->lock, flags);
+	wmb();
 	RTL_W32_F (TxStatus0 + (entry * sizeof (u32)),
 		   tp->tx_flag | max(len, (unsigned int)ETH_ZLEN));
 
 	dev->trans_start = jiffies;
 
 	tp->cur_tx++;
-	wmb();
 
 	if ((tp->cur_tx - NUM_TX_DESC) == tp->dirty_tx)
 		netif_stop_queue (dev);
--
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