x86/ioapic: Use irq_find_matching_fwspec() to find remapping irqdomain

static int mp_irqdomain_create(int ioapic)

{

	struct irq_alloc_info info;

	struct irq_domain *parent;

	int hwirqs = mp_ioapic_pin_count(ioapic);

	struct ioapic *ip = &ioapics[ioapic];

	struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;

	struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);

	struct fwnode_handle *fn;

	char *name = "IO-APIC";

	struct irq_fwspec fwspec;

	if (cfg->type == IOAPIC_DOMAIN_INVALID)

		return 0;

	init_irq_alloc_info(&info, NULL);

	info.type = X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT;

	info.devid = mpc_ioapic_id(ioapic);

	parent = irq_remapping_get_irq_domain(&info);

	if (!parent)

		parent = x86_vector_domain;

	else

		name = "IO-APIC-IR";

	/* Handle device tree enumerated APICs proper */

	if (cfg->dev) {

		fn = of_node_to_fwnode(cfg->dev);

	} else {

		fn = irq_domain_alloc_named_id_fwnode(name, ioapic);

		fn = irq_domain_alloc_named_id_fwnode("IO-APIC", ioapic);

		if (!fn)

			return -ENOMEM;

	}

	fwspec.fwnode = fn;

	fwspec.param_count = 1;

	fwspec.param[0] = ioapic;

	parent = irq_find_matching_fwspec(&fwspec, DOMAIN_BUS_ANY);

	if (!parent) {

		if (!cfg->dev)

			irq_domain_free_fwnode(fn);

		return -ENODEV;

	}

	ip->irqdomain = irq_domain_create_linear(fn, hwirqs, cfg->ops,

						 (void *)(long)ioapic);