static int __init wf_cpufreq_clamp_init()

in windfarm_cpufreq_clamp.c [65:119]

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

static int __init wf_cpufreq_clamp_init(void)
{
	struct cpufreq_policy *policy;
	struct wf_control *clamp;
	struct device *dev;
	int ret;

	policy = cpufreq_cpu_get(0);
	if (!policy) {
		pr_warn("%s: cpufreq policy not found cpu0\n", __func__);
		return -EPROBE_DEFER;
	}

	min_freq = policy->cpuinfo.min_freq;
	max_freq = policy->cpuinfo.max_freq;

	ret = freq_qos_add_request(&policy->constraints, &qos_req, FREQ_QOS_MAX,
				   max_freq);

	cpufreq_cpu_put(policy);

	if (ret < 0) {
		pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
		       ret);
		return ret;
	}

	dev = get_cpu_device(0);
	if (unlikely(!dev)) {
		pr_warn("%s: No cpu device for cpu0\n", __func__);
		ret = -ENODEV;
		goto fail;
	}

	clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL);
	if (clamp == NULL) {
		ret = -ENOMEM;
		goto fail;
	}

	clamp->ops = &clamp_ops;
	clamp->name = "cpufreq-clamp";
	ret = wf_register_control(clamp);
	if (ret)
		goto free;

	clamp_control = clamp;
	return 0;

 free:
	kfree(clamp);
 fail:
	freq_qos_remove_request(&qos_req);
	return ret;
}