static int cpu_pmu_device_probe()

in kernel/perf_event_cpu.c [1128:1170]

• 36 lines of code
• 7 McCabe index (conditional complexity)

static int cpu_pmu_device_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id;
	int (*init_fn)(struct nds32_pmu *nds32_pmu);
	struct device_node *node = pdev->dev.of_node;
	struct nds32_pmu *pmu;
	int ret = -ENODEV;

	if (cpu_pmu) {
		pr_notice("[perf] attempt to register multiple PMU devices!\n");
		return -ENOSPC;
	}

	pmu = kzalloc(sizeof(*pmu), GFP_KERNEL);
	if (!pmu)
		return -ENOMEM;

	of_id = of_match_node(cpu_pmu_of_device_ids, pdev->dev.of_node);
	if (node && of_id) {
		init_fn = of_id->data;
		ret = init_fn(pmu);
	} else {
		ret = probe_current_pmu(pmu);
	}

	if (ret) {
		pr_notice("[perf] failed to probe PMU!\n");
		goto out_free;
	}

	cpu_pmu = pmu;
	cpu_pmu->plat_device = pdev;
	cpu_pmu_init(cpu_pmu);
	ret = nds32_pmu_register(cpu_pmu, PERF_TYPE_RAW);

	if (!ret)
		return 0;

out_free:
	pr_notice("[perf] failed to register PMU devices!\n");
	kfree(pmu);
	return ret;
}