int intc_irq_lookup()

in intc/virq.c [50:81]

• 21 lines of code
• 4 McCabe index (conditional complexity)

int intc_irq_lookup(const char *chipname, intc_enum enum_id)
{
	struct intc_map_entry *ptr;
	struct intc_desc_int *d;
	int irq = -1;

	list_for_each_entry(d, &intc_list, list) {
		int tagged;

		if (strcmp(d->chip.name, chipname) != 0)
			continue;

		/*
		 * Catch early lookups for subgroup VIRQs that have not
		 * yet been allocated an IRQ. This already includes a
		 * fast-path out if the tree is untagged, so there is no
		 * need to explicitly test the root tree.
		 */
		tagged = radix_tree_tag_get(&d->tree, enum_id,
					    INTC_TAG_VIRQ_NEEDS_ALLOC);
		if (unlikely(tagged))
			break;

		ptr = radix_tree_lookup(&d->tree, enum_id);
		if (ptr) {
			irq = ptr - intc_irq_xlate;
			break;
		}
	}

	return irq;
}