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    Subject[PATCH 10/17] xen: pre-initialize legacy irqs early
    Date
    From: Ian Campbell <ian.campbell@citrix.com>

    Various legacy devices, such as IDE, assume their legacy interrupts are
    already initialized and are immediately usable. Pre-initialize all the
    legacy interrupts.

    [ Impact: ISA/legacy device compat ]

    Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    ---
    arch/x86/xen/pci.c | 6 +++++-
    1 files changed, 5 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/xen/pci.c b/arch/x86/xen/pci.c
    index af4e898..402a5bd 100644
    --- a/arch/x86/xen/pci.c
    +++ b/arch/x86/xen/pci.c
    @@ -63,9 +63,9 @@ int xen_register_gsi(u32 gsi, int triggering, int polarity)

    void __init xen_setup_pirqs(void)
    {
    -#ifdef CONFIG_ACPI
    int irq;

    +#ifdef CONFIG_ACPI
    /*
    * Set up acpi interrupt in acpi_gbl_FADT.sci_interrupt.
    */
    @@ -77,4 +77,8 @@ void __init xen_setup_pirqs(void)
    /* Blerk. */
    acpi_gbl_FADT.sci_interrupt = irq;
    #endif
    +
    + /* Pre-allocate legacy irqs */
    + for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
    + xen_allocate_pirq(irq);
    }
    --
    1.6.0.6


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