static int iosapic_find_sharable_irq()

in kernel/iosapic.c [483:508]

• 20 lines of code
• 10 McCabe index (conditional complexity)

static int iosapic_find_sharable_irq(unsigned long trigger, unsigned long pol)
{
	int i, irq = -ENOSPC, min_count = -1;
	struct iosapic_intr_info *info;

	/*
	 * shared vectors for edge-triggered interrupts are not
	 * supported yet
	 */
	if (trigger == IOSAPIC_EDGE)
		return -EINVAL;

	for (i = 0; i < NR_IRQS; i++) {
		info = &iosapic_intr_info[i];
		if (info->trigger == trigger && info->polarity == pol &&
		    (info->dmode == IOSAPIC_FIXED ||
		     info->dmode == IOSAPIC_LOWEST_PRIORITY) &&
		    can_request_irq(i, IRQF_SHARED)) {
			if (min_count == -1 || info->count < min_count) {
				irq = i;
				min_count = info->count;
			}
		}
	}
	return irq;
}