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>

2 files changed, 1 insertions, 3 deletions

diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 38edad6f24b..d9b8ee130c4 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -229,7 +229,7 @@ static void lbs_tx_timeout(struct net_device *dev)
 
         lbs_pr_err("tx watch dog timeout\n");
 
-        dev->trans_start = jiffies;
+        dev->trans_start = jiffies; /* prevent tx timeout */
 
         if (priv->currenttxskb)
                 lbs_send_tx_feedback(priv, 0);
diff --git a/drivers/net/wireless/libertas/tx.c b/drivers/net/wireless/libertas/tx.c
index 52d244ea3d9..a9bf658659e 100644
--- a/drivers/net/wireless/libertas/tx.c
+++ b/drivers/net/wireless/libertas/tx.c
@@ -147,8 +147,6 @@ netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
         dev->stats.tx_packets++;
         dev->stats.tx_bytes += skb->len;
 
-        dev->trans_start = jiffies;
-
         if (priv->monitormode) {
                 /* Keep the skb to echo it back once Tx feedback is
                    received from FW */