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    SubjectQuestions about request_irq and reading PCI_INTERRUPT_LINE
    Date
    Hi, there,

    I have problem to grab video from my ati all-in-wonder card. The card is in
    a PII Celeron machine with an on board video card (ATI Technologies Inc 3D
    Rage IIC AGP). there is no monitor connected with the on board video card. I
    only hook my AIW card with a monitor.

    I use km-0.6 from gatos project. I load this km_drv module, but kernel
    always complains:

    km: IRQ 0 busy

    I checked code:
    km_probe(struct pci_dev *dev, const struct pci_device_id *pci_id)

    here dev->irq with a value 0.

    When km_probe gets called, it try to request an IRQ0 returns a -EBUSY:
    kms_irq=dev.irq;
    result=request_irq(kms->irq, handler, SA_SHIRQ, tag, (void *)kms);

    if(result==-EBUSY){
    printk(KERN_ERR "km: IRQ %ld busy\n", kms->irq);
    goto fail;
    }


    So I tried to get right IRQ number using:
    u8 myirq;
    int rtn=pci_read_config_byte(dev,PCI_INTERRUPT_LINE, &myirq);
    dev->irq=myirq;
    kms->irq=dev_irq;
    result=request_irq(kms->irq, handler, SA_SHIRQ, tag, (void *)kms);

    if(result==-EBUSY){
    printk(KERN_ERR "km: IRQ %ld busy\n", kms->irq);
    goto fail;
    }
    if(result<0){
    printk(KERN_ERR "km: could not install irq handler:
    result=%d\n",result);
    goto fail;
    }
    But this time I got:

    km: kms->irq=24
    km: could not install irq handler: result=-38


    My questions are:
    1. I don't know why dev->irq has value of 0?

    2. Is an IRQ number of 24 valid for a Intel PII Celeron?

    3. What does this result=-38 mean?


    Wen, Le


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