netif_xmit_frozen_or_drv_stopped
if (!netif_xmit_frozen_or_drv_stopped(txq))
if (!netif_xmit_frozen_or_drv_stopped(txq)) {
if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) {
if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq))