net: trans_start cleanups

Now that core network takes care of trans_start updates, dont do it
in drivers themselves, if possible. Drivers can avoid one cache miss
(on dev->trans_start) in their start_xmit() handler.

Exceptions are NETIF_F_LLTX drivers

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/epic100.c b/drivers/net/epic100.c
index 8b5a203..a48da2d 100644
--- a/drivers/net/epic100.c
+++ b/drivers/net/epic100.c
@@ -908,7 +908,7 @@
 		outl(TxQueued, dev->base_addr + COMMAND);
 	}
 
-	dev->trans_start = jiffies;
+	dev->trans_start = jiffies; /* prevent tx timeout */
 	ep->stats.tx_errors++;
 	if (!ep->tx_full)
 		netif_wake_queue(dev);
@@ -1006,7 +1006,6 @@
 	/* Trigger an immediate transmit demand. */
 	outl(TxQueued, dev->base_addr + COMMAND);
 
-	dev->trans_start = jiffies;
 	if (debug > 4)
 		printk(KERN_DEBUG "%s: Queued Tx packet size %d to slot %d, "
 			   "flag %2.2x Tx status %8.8x.\n",