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path: root/drivers/net/8139too.c
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Diffstat (limited to 'drivers/net/8139too.c')
-rw-r--r--drivers/net/8139too.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/8139too.c b/drivers/net/8139too.c
index 32e66f0d434..0daf8c15e38 100644
--- a/drivers/net/8139too.c
+++ b/drivers/net/8139too.c
@@ -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.
+ */
+ 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);