static int arm_ccn_probe()

in arm-ccn.c [1460:1518]

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

static int arm_ccn_probe(struct platform_device *pdev)
{
	struct arm_ccn *ccn;
	struct resource *res;
	unsigned int irq;
	int err;

	ccn = devm_kzalloc(&pdev->dev, sizeof(*ccn), GFP_KERNEL);
	if (!ccn)
		return -ENOMEM;
	ccn->dev = &pdev->dev;
	platform_set_drvdata(pdev, ccn);

	ccn->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(ccn->base))
		return PTR_ERR(ccn->base);

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res)
		return -EINVAL;
	irq = res->start;

	/* Check if we can use the interrupt */
	writel(CCN_MN_ERRINT_STATUS__PMU_EVENTS__DISABLE,
			ccn->base + CCN_MN_ERRINT_STATUS);
	if (readl(ccn->base + CCN_MN_ERRINT_STATUS) &
			CCN_MN_ERRINT_STATUS__PMU_EVENTS__DISABLED) {
		/* Can set 'disable' bits, so can acknowledge interrupts */
		writel(CCN_MN_ERRINT_STATUS__PMU_EVENTS__ENABLE,
				ccn->base + CCN_MN_ERRINT_STATUS);
		err = devm_request_irq(ccn->dev, irq, arm_ccn_irq_handler,
				       IRQF_NOBALANCING | IRQF_NO_THREAD,
				       dev_name(ccn->dev), ccn);
		if (err)
			return err;

		ccn->irq = irq;
	}


	/* Build topology */

	err = arm_ccn_for_each_valid_region(ccn, arm_ccn_get_nodes_num);
	if (err)
		return err;

	ccn->node = devm_kcalloc(ccn->dev, ccn->num_nodes, sizeof(*ccn->node),
				 GFP_KERNEL);
	ccn->xp = devm_kcalloc(ccn->dev, ccn->num_xps, sizeof(*ccn->node),
			       GFP_KERNEL);
	if (!ccn->node || !ccn->xp)
		return -ENOMEM;

	err = arm_ccn_for_each_valid_region(ccn, arm_ccn_init_nodes);
	if (err)
		return err;

	return arm_ccn_pmu_init(ccn);
}