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    Subject[Patch v7 01/18] ACPI, irq: fix regression casued by 6b9fb7082409
    Date
    When IOAPIC is disabled, acpi_gsi_to_irq() should return gsi directly
    instead of calling mp_map_gsi_to_irq() to translate gsi to IRQ by IOAPIC.
    It fixes https://bugzilla.kernel.org/show_bug.cgi?id=84381.

    Reported-by: Thomas Richter <thor@math.tu-berlin.de>
    Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
    Cc: rui.zhang@intel.com
    Cc: <stable@vger.kernel.org> # 3.17
    ---
    arch/x86/kernel/acpi/boot.c | 13 +++++++++----
    1 file changed, 9 insertions(+), 4 deletions(-)

    diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
    index b436fc735aa4..eceba9d9e116 100644
    --- a/arch/x86/kernel/acpi/boot.c
    +++ b/arch/x86/kernel/acpi/boot.c
    @@ -604,14 +604,19 @@ void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)

    int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
    {
    - int irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC | IOAPIC_MAP_CHECK);
    + int irq;

    - if (irq >= 0) {
    + if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
    + *irqp = gsi;
    + } else {
    + irq = mp_map_gsi_to_irq(gsi,
    + IOAPIC_MAP_ALLOC | IOAPIC_MAP_CHECK);
    + if (irq < 0)
    + return -1;
    *irqp = irq;
    - return 0;
    }

    - return -1;
    + return 0;
    }
    EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);

    --
    1.7.10.4


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