static int dsu_pmu_device_probe()

in arm_dsu_pmu.c [706:775]

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

static int dsu_pmu_device_probe(struct platform_device *pdev)
{
	int irq, rc;
	struct dsu_pmu *dsu_pmu;
	struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
	char *name;
	static atomic_t pmu_idx = ATOMIC_INIT(-1);

	dsu_pmu = dsu_pmu_alloc(pdev);
	if (IS_ERR(dsu_pmu))
		return PTR_ERR(dsu_pmu);

	if (is_of_node(fwnode))
		rc = dsu_pmu_dt_get_cpus(&pdev->dev, &dsu_pmu->associated_cpus);
	else if (is_acpi_device_node(fwnode))
		rc = dsu_pmu_acpi_get_cpus(&pdev->dev, &dsu_pmu->associated_cpus);
	else
		return -ENOENT;

	if (rc) {
		dev_warn(&pdev->dev, "Failed to parse the CPUs\n");
		return rc;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return -EINVAL;

	name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_%d",
				PMUNAME, atomic_inc_return(&pmu_idx));
	if (!name)
		return -ENOMEM;
	rc = devm_request_irq(&pdev->dev, irq, dsu_pmu_handle_irq,
			      IRQF_NOBALANCING, name, dsu_pmu);
	if (rc) {
		dev_warn(&pdev->dev, "Failed to request IRQ %d\n", irq);
		return rc;
	}

	dsu_pmu->irq = irq;
	platform_set_drvdata(pdev, dsu_pmu);
	rc = cpuhp_state_add_instance(dsu_pmu_cpuhp_state,
						&dsu_pmu->cpuhp_node);
	if (rc)
		return rc;

	dsu_pmu->pmu = (struct pmu) {
		.task_ctx_nr	= perf_invalid_context,
		.module		= THIS_MODULE,
		.pmu_enable	= dsu_pmu_enable,
		.pmu_disable	= dsu_pmu_disable,
		.event_init	= dsu_pmu_event_init,
		.add		= dsu_pmu_add,
		.del		= dsu_pmu_del,
		.start		= dsu_pmu_start,
		.stop		= dsu_pmu_stop,
		.read		= dsu_pmu_read,

		.attr_groups	= dsu_pmu_attr_groups,
		.capabilities	= PERF_PMU_CAP_NO_EXCLUDE,
	};

	rc = perf_pmu_register(&dsu_pmu->pmu, name, -1);
	if (rc) {
		cpuhp_state_remove_instance(dsu_pmu_cpuhp_state,
						 &dsu_pmu->cpuhp_node);
	}

	return rc;
}