static int do_set_irq_trigger()

in dfl.c [1730:1773]

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

static int do_set_irq_trigger(struct dfl_feature *feature, unsigned int idx,
			      int fd)
{
	struct platform_device *pdev = feature->dev;
	struct eventfd_ctx *trigger;
	int irq, ret;

	irq = feature->irq_ctx[idx].irq;

	if (feature->irq_ctx[idx].trigger) {
		free_irq(irq, feature->irq_ctx[idx].trigger);
		kfree(feature->irq_ctx[idx].name);
		eventfd_ctx_put(feature->irq_ctx[idx].trigger);
		feature->irq_ctx[idx].trigger = NULL;
	}

	if (fd < 0)
		return 0;

	feature->irq_ctx[idx].name =
		kasprintf(GFP_KERNEL, "fpga-irq[%u](%s-%x)", idx,
			  dev_name(&pdev->dev), feature->id);
	if (!feature->irq_ctx[idx].name)
		return -ENOMEM;

	trigger = eventfd_ctx_fdget(fd);
	if (IS_ERR(trigger)) {
		ret = PTR_ERR(trigger);
		goto free_name;
	}

	ret = request_irq(irq, dfl_irq_handler, 0,
			  feature->irq_ctx[idx].name, trigger);
	if (!ret) {
		feature->irq_ctx[idx].trigger = trigger;
		return ret;
	}

	eventfd_ctx_put(trigger);
free_name:
	kfree(feature->irq_ctx[idx].name);

	return ret;
}