Function intr_isrc_register

freebsd/kern/subr_intr.c:456–487

* Initialize interrupt source and register it into global interrupt table. */

 *  Initialize interrupt source and register it into global interrupt table.
 */
int
intr_isrc_register(struct intr_irqsrc *isrc, device_t dev, u_int flags,
    const char *fmt, ...)
{
	int error;
	va_list ap;

	bzero(isrc, sizeof(struct intr_irqsrc));
	isrc->isrc_dev = dev;
	isrc->isrc_irq = INTR_IRQ_INVALID;	/* just to be safe */
	isrc->isrc_flags = flags;

	va_start(ap, fmt);
	vsnprintf(isrc->isrc_name, INTR_ISRC_NAMELEN, fmt, ap);
	va_end(ap);

	mtx_lock(&isrc_table_lock);
	error = isrc_alloc_irq(isrc);
	if (error != 0) {
		mtx_unlock(&isrc_table_lock);
		return (error);
	}
	/*
	 * Setup interrupt counters, but not for IPI sources. Those are setup
	 * later and only for used ones (up to INTR_IPI_COUNT) to not exhaust
	 * our counter pool.
	 */
	if ((isrc->isrc_flags & INTR_ISRCF_IPI) == 0)
		isrc_setup_counters(isrc);
	mtx_unlock(&isrc_table_lock);
	return (0);
}

/*
 *  Deregister interrupt source from global interrupt table.