Commit 176eaa58 authored by Andreas Oberritter's avatar Andreas Oberritter Committed by David S. Miller

8139too: move wmb before TX DMA start

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: default avatarAndreas Oberritter <>
Signed-off-by: default avatarDavid S. Miller <>
parent ed4cb133
......@@ -1723,13 +1723,18 @@ static int rtl8139_start_xmit (struct sk_buff *skb, struct net_device *dev)
spin_lock_irqsave(&tp->lock, flags);
* Writing to TxStatus triggers a DMA transfer of the data
* copied to tp->tx_buf[entry] above. Use a memory barrier
* to make sure that the device sees the updated data.
RTL_W32_F (TxStatus0 + (entry * sizeof (u32)),
tp->tx_flag | max(len, (unsigned int)ETH_ZLEN));
dev->trans_start = jiffies;
if ((tp->cur_tx - NUM_TX_DESC) == tp->dirty_tx)
netif_stop_queue (dev);
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