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    Subject[PATCH] x86/ioapic: Do not unmask io_apic when interrupt is in progress
    From: Ingo Molnar <mingo@elte.hu>
    Date: Fri, 3 Jul 2009 08:29:27 -0500

    With threaded interrupts we might see an interrupt in progress on
    migration. Do not unmask it when this is the case.

    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
    ---
    arch/x86/kernel/apic/io_apic.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/arch/x86/kernel/apic/io_apic.c
    +++ b/arch/x86/kernel/apic/io_apic.c
    @@ -1690,7 +1690,8 @@ static bool io_apic_level_ack_pending(st
    static inline bool ioapic_irqd_mask(struct irq_data *data)
    {
    /* If we are moving the irq we need to mask it */
    - if (unlikely(irqd_is_setaffinity_pending(data))) {
    + if (unlikely(irqd_is_setaffinity_pending(data) &&
    + !irqd_irq_inprogress(data))) {
    mask_ioapic_irq(data);
    return true;
    }
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