static int csky_pmu_request_irq()

in kernel/perf_event.c [1160:1186]

• 23 lines of code
• 5 McCabe index (conditional complexity)

static int csky_pmu_request_irq(irq_handler_t handler)
{
	int err, irqs;
	struct platform_device *pmu_device = csky_pmu.plat_device;

	if (!pmu_device)
		return -ENODEV;

	irqs = min(pmu_device->num_resources, num_possible_cpus());
	if (irqs < 1) {
		pr_err("no irqs for PMUs defined\n");
		return -ENODEV;
	}

	csky_pmu_irq = platform_get_irq(pmu_device, 0);
	if (csky_pmu_irq < 0)
		return -ENODEV;
	err = request_percpu_irq(csky_pmu_irq, handler, "csky-pmu",
				 this_cpu_ptr(csky_pmu.hw_events));
	if (err) {
		pr_err("unable to request IRQ%d for CSKY PMU counters\n",
		       csky_pmu_irq);
		return err;
	}

	return 0;
}