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>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 5267c27e3174..11d8cae415e5 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -1738,7 +1738,7 @@ void gfar_start(struct net_device *dev)
                 gfar_write(&regs->imask, IMASK_DEFAULT);
         }
 
-        dev->trans_start = jiffies;
+        dev->trans_start = jiffies; /* prevent tx timeout */
 }
 
 void gfar_configure_coalescing(struct gfar_private *priv,
@@ -2161,8 +2161,6 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
         /* reduce TxBD free count */
         tx_queue->num_txbdfree -= (nr_txbds);
 
-        dev->trans_start = jiffies;
-
         /* If the next BD still needs to be cleaned up, then the bds
            are full.  We need to tell the kernel to stop sending us stuff. */
         if (!tx_queue->num_txbdfree) {