[PATCH net v6 3/4] tg3: Move tx queue stop logic to its own function

It is duplicated. Also, the first instance in tg3_start_xmit() is racy. Consider: tg3_start_xmit() if budget <= ... tg3_tx() (free up the entire ring) tx_cons =

[PATCH net v6 3/4] tg3: Move tx queue stop logic to its own function

It is duplicated. Also, the first instance in tg3_start_xmit() is racy. Consider: tg3_start_xmit() if budget = ... tg3_tx() (free up the entire ring) tx_cons =