int iosapic_remove()

in kernel/iosapic.c [1086:1121]

• 31 lines of code
• 6 McCabe index (conditional complexity)

int iosapic_remove(unsigned int gsi_base)
{
	int i, irq, index, err = 0;
	unsigned long flags;

	spin_lock_irqsave(&iosapic_lock, flags);
	index = find_iosapic(gsi_base);
	if (index < 0) {
		printk(KERN_WARNING "%s: No IOSAPIC for GSI base %u\n",
		       __func__, gsi_base);
		goto out;
	}

	if (iosapic_lists[index].rtes_inuse) {
		err = -EBUSY;
		printk(KERN_WARNING "%s: IOSAPIC for GSI base %u is busy\n",
		       __func__, gsi_base);
		goto out;
	}

	for (i = gsi_base; i < gsi_base + iosapic_lists[index].num_rte; i++) {
		irq = __gsi_to_irq(i);
		if (irq < 0)
			continue;

		err = iosapic_delete_rte(irq, i);
		if (err)
			goto out;
	}

	iounmap(iosapic_lists[index].addr);
	iosapic_free(index);
 out:
	spin_unlock_irqrestore(&iosapic_lock, flags);
	return err;
}