static void __init intc_subgroup_map()

in intc/virq.c [201:260]

• 42 lines of code
• 5 McCabe index (conditional complexity)

static void __init intc_subgroup_map(struct intc_desc_int *d)
{
	struct intc_subgroup_entry *entries[32];
	unsigned long flags;
	unsigned int nr_found;
	int i;

	raw_spin_lock_irqsave(&d->lock, flags);

restart:
	nr_found = radix_tree_gang_lookup_tag_slot(&d->tree,
			(void ***)entries, 0, ARRAY_SIZE(entries),
			INTC_TAG_VIRQ_NEEDS_ALLOC);

	for (i = 0; i < nr_found; i++) {
		struct intc_subgroup_entry *entry;
		int irq;

		entry = radix_tree_deref_slot((void **)entries[i]);
		if (unlikely(!entry))
			continue;
		if (radix_tree_deref_retry(entry))
			goto restart;

		irq = irq_alloc_desc(numa_node_id());
		if (unlikely(irq < 0)) {
			pr_err("no more free IRQs, bailing..\n");
			break;
		}

		activate_irq(irq);

		pr_info("Setting up a chained VIRQ from %d -> %d\n",
			irq, entry->pirq);

		intc_irq_xlate_set(irq, entry->enum_id, d);

		irq_set_chip_and_handler_name(irq, irq_get_chip(entry->pirq),
					      handle_simple_irq, "virq");
		irq_set_chip_data(irq, irq_get_chip_data(entry->pirq));

		irq_set_handler_data(irq, (void *)entry->handle);

		/*
		 * Set the virtual IRQ as non-threadable.
		 */
		irq_set_nothread(irq);

		/* Set handler data before installing the handler */
		add_virq_to_pirq(entry->pirq, irq);
		irq_set_chained_handler(entry->pirq, intc_virq_handler);

		radix_tree_tag_clear(&d->tree, entry->enum_id,
				     INTC_TAG_VIRQ_NEEDS_ALLOC);
		radix_tree_replace_slot(&d->tree, (void **)entries[i],
					&intc_irq_xlate[irq]);
	}

	raw_spin_unlock_irqrestore(&d->lock, flags);
}