static int tpci200_free_irq()

in carriers/tpci200.c [162:187]

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

static int tpci200_free_irq(struct ipack_device *dev)
{
	struct slot_irq *slot_irq;
	struct tpci200_board *tpci200;

	tpci200 = check_slot(dev);
	if (tpci200 == NULL)
		return -EINVAL;

	if (mutex_lock_interruptible(&tpci200->mutex))
		return -ERESTARTSYS;

	if (tpci200->slots[dev->slot].irq == NULL) {
		mutex_unlock(&tpci200->mutex);
		return -EINVAL;
	}

	tpci200_disable_irq(tpci200, dev->slot);
	slot_irq = tpci200->slots[dev->slot].irq;
	/* uninstall handler */
	RCU_INIT_POINTER(tpci200->slots[dev->slot].irq, NULL);
	synchronize_rcu();
	kfree(slot_irq);
	mutex_unlock(&tpci200->mutex);
	return 0;
}