int vme_irq_request()

in vme.c [1333:1373]

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

int vme_irq_request(struct vme_dev *vdev, int level, int statid,
	void (*callback)(int, int, void *),
	void *priv_data)
{
	struct vme_bridge *bridge;

	bridge = vdev->bridge;
	if (!bridge) {
		printk(KERN_ERR "Can't find VME bus\n");
		return -EINVAL;
	}

	if ((level < 1) || (level > 7)) {
		printk(KERN_ERR "Invalid interrupt level\n");
		return -EINVAL;
	}

	if (!bridge->irq_set) {
		printk(KERN_ERR "Configuring interrupts not supported\n");
		return -EINVAL;
	}

	mutex_lock(&bridge->irq_mtx);

	if (bridge->irq[level - 1].callback[statid].func) {
		mutex_unlock(&bridge->irq_mtx);
		printk(KERN_WARNING "VME Interrupt already taken\n");
		return -EBUSY;
	}

	bridge->irq[level - 1].count++;
	bridge->irq[level - 1].callback[statid].priv_data = priv_data;
	bridge->irq[level - 1].callback[statid].func = callback;

	/* Enable IRQ level */
	bridge->irq_set(bridge, level, 1, 1);

	mutex_unlock(&bridge->irq_mtx);

	return 0;
}