2.4.2-ac16 PIIX4 ACPI getting wrong IRQ?

From: Thomas Hood (jdthoodREMOVETHIS@yahoo.co.uk)
Date: Fri Mar 09 2001 - 20:42:36 EST

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    With 2.4.3-pre1, /proc/pci contained:
    > Bus 0, device 7, function 3:
    > Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 1).

    With 2.4.2-ac16, /proc/pci contains:
    > Bus 0, device 7, function 3:
    > Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 1).
    > IRQ 9.

    So the ACPI function of the PIIX4 is now being given
    IRQ 9. I don't want this. I was using IRQ 9 for a
    PCMCIA device.

    So I tried booting the kernel with "acpi=off" and
    "pci=irqmask=0x0800", but the result was the same.

    Documentation/kernel-parameters.txt says that
    "pci=irqmask=0xMMMM ... sets a bit mask of IRQs allowed
    to be assigned". This parameter is being ignored.

    [... searches through kernel sources ...]

    Well I see that this is the result of a change to
    /usr/src/linux-2.4.2-ac16/arch/i386/kernel/pci_pc.c
    which looks deliberate:

    < static void __init pci_fixup_piix4_acpi(struct pci_dev *d)
    < {
    < /*
    < * PIIX4 ACPI device: hardwired IRQ9
    < */
    < d->irq = 9;
    < }

    What's going on?

    Thomas Hood
    jdthood_AT_yahoo.co.uk
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