static int apple_mbox_probe()

in apple-mailbox.c [266:330]

• 54 lines of code
• 11 McCabe index (conditional complexity)

static int apple_mbox_probe(struct platform_device *pdev)
{
	int ret;
	const struct of_device_id *match;
	char *irqname;
	struct apple_mbox *mbox;
	struct device *dev = &pdev->dev;

	match = of_match_node(apple_mbox_of_match, pdev->dev.of_node);
	if (!match)
		return -EINVAL;
	if (!match->data)
		return -EINVAL;

	mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
	if (!mbox)
		return -ENOMEM;
	platform_set_drvdata(pdev, mbox);

	mbox->dev = dev;
	mbox->regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(mbox->regs))
		return PTR_ERR(mbox->regs);

	mbox->hw = match->data;
	mbox->irq_recv_not_empty =
		platform_get_irq_byname(pdev, "recv-not-empty");
	if (mbox->irq_recv_not_empty < 0)
		return -ENODEV;

	mbox->irq_send_empty = platform_get_irq_byname(pdev, "send-empty");
	if (mbox->irq_send_empty < 0)
		return -ENODEV;

	mbox->controller.dev = mbox->dev;
	mbox->controller.num_chans = 1;
	mbox->controller.chans = &mbox->chan;
	mbox->controller.ops = &apple_mbox_ops;
	mbox->controller.txdone_irq = true;
	mbox->controller.of_xlate = apple_mbox_of_xlate;
	mbox->chan.con_priv = mbox;

	irqname = devm_kasprintf(dev, GFP_KERNEL, "%s-recv", dev_name(dev));
	if (!irqname)
		return -ENOMEM;

	ret = devm_request_threaded_irq(dev, mbox->irq_recv_not_empty, NULL,
					apple_mbox_recv_irq,
					IRQF_NO_AUTOEN | IRQF_ONESHOT, irqname,
					mbox);
	if (ret)
		return ret;

	irqname = devm_kasprintf(dev, GFP_KERNEL, "%s-send", dev_name(dev));
	if (!irqname)
		return -ENOMEM;

	ret = devm_request_irq(dev, mbox->irq_send_empty,
			       apple_mbox_send_empty_irq, IRQF_NO_AUTOEN,
			       irqname, mbox);
	if (ret)
		return ret;

	return devm_mbox_controller_register(dev, &mbox->controller);
}