static int __init arm_idle_init_cpu()

in cpuidle-arm.c [78:135]

• 29 lines of code
• 8 McCabe index (conditional complexity)

static int __init arm_idle_init_cpu(int cpu)
{
	int ret;
	struct cpuidle_driver *drv;

	drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL);
	if (!drv)
		return -ENOMEM;

	drv->cpumask = (struct cpumask *)cpumask_of(cpu);

	/*
	 * Initialize idle states data, starting at index 1.  This
	 * driver is DT only, if no DT idle states are detected (ret
	 * == 0) let the driver initialization fail accordingly since
	 * there is no reason to initialize the idle driver if only
	 * wfi is supported.
	 */
	ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);
	if (ret <= 0) {
		ret = ret ? : -ENODEV;
		goto out_kfree_drv;
	}

	/*
	 * Call arch CPU operations in order to initialize
	 * idle states suspend back-end specific data
	 */
	ret = arm_cpuidle_init(cpu);

	/*
	 * Allow the initialization to continue for other CPUs, if the
	 * reported failure is a HW misconfiguration/breakage (-ENXIO).
	 *
	 * Some platforms do not support idle operations
	 * (arm_cpuidle_init() returning -EOPNOTSUPP), we should
	 * not flag this case as an error, it is a valid
	 * configuration.
	 */
	if (ret) {
		if (ret != -EOPNOTSUPP)
			pr_err("CPU %d failed to init idle CPU ops\n", cpu);
		ret = ret == -ENXIO ? 0 : ret;
		goto out_kfree_drv;
	}

	ret = cpuidle_register(drv, NULL);
	if (ret)
		goto out_kfree_drv;

	cpuidle_cooling_register(drv);

	return 0;

out_kfree_drv:
	kfree(drv);
	return ret;
}