static int altera_mbox_probe()

in mailbox-altera.c [285:339]

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

static int altera_mbox_probe(struct platform_device *pdev)
{
	struct altera_mbox *mbox;
	struct mbox_chan *chans;
	int ret;

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

	/* Allocated one channel */
	chans = devm_kzalloc(&pdev->dev, sizeof(*chans), GFP_KERNEL);
	if (!chans)
		return -ENOMEM;

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

	/* Check is it a sender or receiver? */
	mbox->is_sender = altera_mbox_is_sender(mbox);

	mbox->irq = platform_get_irq(pdev, 0);
	if (mbox->irq >= 0)
		mbox->intr_mode = true;

	mbox->dev = &pdev->dev;

	/* Hardware supports only one channel. */
	chans[0].con_priv = mbox;
	mbox->controller.dev = mbox->dev;
	mbox->controller.num_chans = 1;
	mbox->controller.chans = chans;
	mbox->controller.ops = &altera_mbox_ops;

	if (mbox->is_sender) {
		if (mbox->intr_mode) {
			mbox->controller.txdone_irq = true;
		} else {
			mbox->controller.txdone_poll = true;
			mbox->controller.txpoll_period = MBOX_POLLING_MS;
		}
	}

	ret = devm_mbox_controller_register(&pdev->dev, &mbox->controller);
	if (ret) {
		dev_err(&pdev->dev, "Register mailbox failed\n");
		goto err;
	}

	platform_set_drvdata(pdev, mbox);
err:
	return ret;
}