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Commit 8d966a04 authored by Fenghua Yu's avatar Fenghua Yu Committed by H. Peter Anvin
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x86, hotplug: Handle retrigger irq by the first available CPU 



The first cpu in irq cfg->domain is likely to be CPU 0 and may not be available
when CPU 0 is offline. Instead of using CPU 0 to handle retriggered irq, we use
first available CPU which is online and in this irq's domain.

Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1352835171-3958-13-git-send-email-fenghua.yu@intel.com


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 30242aa6

arch/x86/kernel/apic/io_apic.c

+3 −1
Original line number Diff line number Diff line
@@ -2199,9 +2199,11 @@ static int ioapic_retrigger_irq(struct irq_data *data) 
{

	struct irq_cfg *cfg = data->chip_data;

	unsigned long flags;

	int cpu;



	raw_spin_lock_irqsave(&vector_lock, flags);

	apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);

	cpu = cpumask_first_and(cfg->domain, cpu_online_mask);

	apic->send_IPI_mask(cpumask_of(cpu), cfg->vector);

	raw_spin_unlock_irqrestore(&vector_lock, flags);



	return 1;