Commit 0abce64a authored Jun 23, 2017 by Marc Zyngier

genirq: Let irq_set_vcpu_affinity() iterate over hierarchy



When assigning an interrupt to a vcpu, it is not unlikely that
the level of the hierarchy implementing irq_set_vcpu_affinity
is not the top level (think a generic MSI domain on top of a
virtualization aware interrupt controller).

In such a case, let's iterate over the hierarchy until we find
an irqchip implementing it.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

parent e81f54c6

kernel/irq/manage.c

+12 −2

Original line number	Diff line number	Diff line
		@@ -400,8 +400,18 @@ int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info)
		return -EINVAL;

		data = irq_desc_get_irq_data(desc);
		do {
		chip = irq_data_get_irq_chip(data);
		if (chip && chip->irq_set_vcpu_affinity)
		break;
		#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
		data = data->parent_data;
		#else
		data = NULL;
		#endif
		} while (data);

		if (data)
		ret = chip->irq_set_vcpu_affinity(data, vcpu_info);
		irq_put_desc_unlock(desc, flags);

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