static int l2_cache_pmu_probe_cluster()

in qcom_l2_pmu.c [839:889]

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

static int l2_cache_pmu_probe_cluster(struct device *dev, void *data)
{
	struct platform_device *pdev = to_platform_device(dev->parent);
	struct platform_device *sdev = to_platform_device(dev);
	struct acpi_device *adev = ACPI_COMPANION(dev);
	struct l2cache_pmu *l2cache_pmu = data;
	struct cluster_pmu *cluster;
	unsigned long fw_cluster_id;
	int err;
	int irq;

	if (!adev || kstrtoul(adev->pnp.unique_id, 10, &fw_cluster_id) < 0) {
		dev_err(&pdev->dev, "unable to read ACPI uid\n");
		return -ENODEV;
	}

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

	INIT_LIST_HEAD(&cluster->next);
	list_add(&cluster->next, &l2cache_pmu->clusters);
	cluster->cluster_id = fw_cluster_id;

	irq = platform_get_irq(sdev, 0);
	if (irq < 0)
		return irq;
	cluster->irq = irq;

	cluster->l2cache_pmu = l2cache_pmu;
	cluster->on_cpu = -1;

	err = devm_request_irq(&pdev->dev, irq, l2_cache_handle_irq,
			       IRQF_NOBALANCING | IRQF_NO_THREAD |
			       IRQF_NO_AUTOEN,
			       "l2-cache-pmu", cluster);
	if (err) {
		dev_err(&pdev->dev,
			"Unable to request IRQ%d for L2 PMU counters\n", irq);
		return err;
	}

	dev_info(&pdev->dev,
		"Registered L2 cache PMU cluster %ld\n", fw_cluster_id);

	spin_lock_init(&cluster->pmu_lock);

	l2cache_pmu->num_pmus++;

	return 0;
}