vorher



 retval = request_irq(DANUBEASC1_TIR, danubeasc_tx_int, 0, "asc_tx", port);
    if (retval){
        printk("failed to request danubeasc_tx_int\n");
        goto err1;
    }


nachher

 retval = request_irq(DANUBEASC1_TIR, danubeasc_tx_int, IRQF_DISABLED, "asc_tx", port);
    if (retval){
        printk("failed to request danubeasc_tx_int\n");
        goto err1;
    }