static int __init exynos4_timer_interrupts()

in exynos_mct.c [528:601]

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

static int __init exynos4_timer_interrupts(struct device_node *np,
					   unsigned int int_type)
{
	int nr_irqs, i, err, cpu;

	mct_int_type = int_type;

	/* This driver uses only one global timer interrupt */
	mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);

	/*
	 * Find out the number of local irqs specified. The local
	 * timer irqs are specified after the four global timer
	 * irqs are specified.
	 */
	nr_irqs = of_irq_count(np);
	for (i = MCT_L0_IRQ; i < nr_irqs; i++)
		mct_irqs[i] = irq_of_parse_and_map(np, i);

	if (mct_int_type == MCT_INT_PPI) {

		err = request_percpu_irq(mct_irqs[MCT_L0_IRQ],
					 exynos4_mct_tick_isr, "MCT",
					 &percpu_mct_tick);
		WARN(err, "MCT: can't request IRQ %d (%d)\n",
		     mct_irqs[MCT_L0_IRQ], err);
	} else {
		for_each_possible_cpu(cpu) {
			int mct_irq = mct_irqs[MCT_L0_IRQ + cpu];
			struct mct_clock_event_device *pcpu_mevt =
				per_cpu_ptr(&percpu_mct_tick, cpu);

			pcpu_mevt->evt.irq = -1;

			irq_set_status_flags(mct_irq, IRQ_NOAUTOEN);
			if (request_irq(mct_irq,
					exynos4_mct_tick_isr,
					IRQF_TIMER | IRQF_NOBALANCING,
					pcpu_mevt->name, pcpu_mevt)) {
				pr_err("exynos-mct: cannot register IRQ (cpu%d)\n",
									cpu);

				continue;
			}
			pcpu_mevt->evt.irq = mct_irq;
		}
	}

	/* Install hotplug callbacks which configure the timer on this CPU */
	err = cpuhp_setup_state(CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
				"clockevents/exynos4/mct_timer:starting",
				exynos4_mct_starting_cpu,
				exynos4_mct_dying_cpu);
	if (err)
		goto out_irq;

	return 0;

out_irq:
	if (mct_int_type == MCT_INT_PPI) {
		free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
	} else {
		for_each_possible_cpu(cpu) {
			struct mct_clock_event_device *pcpu_mevt =
				per_cpu_ptr(&percpu_mct_tick, cpu);

			if (pcpu_mevt->evt.irq != -1) {
				free_irq(pcpu_mevt->evt.irq, pcpu_mevt);
				pcpu_mevt->evt.irq = -1;
			}
		}
	}
	return err;
}