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>

4 files changed, 0 insertions, 6 deletions

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index 5f983487d6e4..2d8bd86bc5e2 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -375,7 +375,6 @@ static netdev_tx_t at91_start_xmit(struct sk_buff *skb, struct net_device *dev)
         at91_write(priv, AT91_MCR(mb), reg_mcr);
 
         stats->tx_bytes += cf->can_dlc;
-        dev->trans_start = jiffies;
 
         /* _NOTE_: substract AT91_MB_TX_FIRST offset from mb! */
         can_put_echo_skb(skb, dev, mb - AT91_MB_TX_FIRST);
diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
index d77264ad326d..b6e890d28366 100644
--- a/drivers/net/can/bfin_can.c
+++ b/drivers/net/can/bfin_can.c
@@ -269,8 +269,6 @@ static int bfin_can_start_xmit(struct sk_buff *skb, struct net_device *dev)
         /* fill data length code */
         bfin_write16(&reg->chl[TRANSMIT_CHL].dlc, dlc);
 
-        dev->trans_start = jiffies;
-
         can_put_echo_skb(skb, dev, 0);
 
         /* set transmit request */
diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c
index 8431eb08075d..b11a0cb5ed81 100644
--- a/drivers/net/can/mcp251x.c
+++ b/drivers/net/can/mcp251x.c
@@ -475,7 +475,6 @@ static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb,
 
         netif_stop_queue(net);
         priv->tx_skb = skb;
-        net->trans_start = jiffies;
         queue_work(priv->wq, &priv->tx_work);
 
         return NETDEV_TX_OK;
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 618c11222abc..24b58619f7c1 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -292,8 +292,6 @@ static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
         for (i = 0; i < dlc; i++)
                 priv->write_reg(priv, dreg++, cf->data[i]);
 
-        dev->trans_start = jiffies;
-
         can_put_echo_skb(skb, dev, 0);
 
         priv->write_reg(priv, REG_CMR, CMD_TR);