IR_TEFN
if (cdev->tx_coalesce_usecs_irq > 0 && (ir & (IR_TEFN | IR_TEFW))) {
new_interrupts &= ~IR_TEFN;
new_interrupts |= IR_TEFN;
if (ir & (IR_TEFN | IR_TEFW)) {
cdev->active_interrupts |= IR_RF0N | IR_TEFN;
u32 new_interrupts = cdev->active_interrupts | IR_RF0N | IR_TEFN;