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>

3 files changed, 1 insertions, 5 deletions

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index be0cc99e881a..a6227f892d1b 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -834,8 +834,6 @@ static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
         } else {
                 net->stats.tx_packets++;
                 net->stats.tx_bytes += skb->len;
-                /* And tell the kernel when the last transmit started. */
-                net->trans_start = jiffies;
         }
         dev_kfree_skb(skb);
         /* we're done */
diff --git a/drivers/net/usb/kaweth.c b/drivers/net/usb/kaweth.c
index c4c334d9770f..46890dc625dc 100644
--- a/drivers/net/usb/kaweth.c
+++ b/drivers/net/usb/kaweth.c
@@ -856,7 +856,6 @@ skip:
         {
                 kaweth->stats.tx_packets++;
                 kaweth->stats.tx_bytes += skb->len;
-                net->trans_start = jiffies;
         }
 
         spin_unlock_irq(&kaweth->device_lock);
diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index 41838773b568..1cd17d274a12 100644
--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -808,7 +808,7 @@ static void write_bulk_callback(struct urb *urb)
                 break;
         }
 
-        net->trans_start = jiffies;
+        net->trans_start = jiffies; /* prevent tx timeout */
         netif_wake_queue(net);
 }
 
@@ -909,7 +909,6 @@ static netdev_tx_t pegasus_start_xmit(struct sk_buff *skb,
         } else {
                 pegasus->stats.tx_packets++;
                 pegasus->stats.tx_bytes += skb->len;
-                net->trans_start = jiffies;
         }
         dev_kfree_skb(skb);