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    Subject[PATCH] 2.6.0-test4 Don't change BIOS allocated IRQs
    Date
    With the help of Chris Wright testing several failed patches, I've tracked 
    down another ACPI IRQ problem. On many systems, the BIOS
    pre-allocates IRQs for certain PCI devices, providing a list of alternate
    possibilities as well.

    On some systems, changing the IRQ to one of those alternate possibilities
    works fine. On others however, it really isn't a good idea. As theres no
    way to tell which systems are good and bad in advance, this patch simply
    ensures that ACPI does not change an IRQ if the BIOS has pre-allocated it.



    --- linux-2.6.0-test4.es7000fix/drivers/acpi/pci_link.c 2003-09-06 00:35:16.000000000 +0100
    +++ linux-2.6.0-test4.nochangeirq/drivers/acpi/pci_link.c 2003-09-17 00:00:40.740553544 +0100
    @@ -510,15 +510,15 @@
    irq = link->irq.active;
    } else {
    irq = link->irq.possible[0];
    - }

    - /*
    - * Select the best IRQ. This is done in reverse to promote
    - * the use of IRQs 9, 10, 11, and >15.
    - */
    - for (i=(link->irq.possible_count-1); i>0; i--) {
    - if (acpi_irq_penalty[irq] > acpi_irq_penalty[link->irq.possible[i]])
    - irq = link->irq.possible[i];
    + /*
    + * Select the best IRQ. This is done in reverse to promote
    + * the use of IRQs 9, 10, 11, and >15.
    + */
    + for (i=(link->irq.possible_count-1); i>0; i--) {
    + if (acpi_irq_penalty[irq] > acpi_irq_penalty[link->irq.possible[i]])
    + irq = link->irq.possible[i];
    + }
    }

    /* Attempt to enable the link device at this IRQ. */
    -
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