static int __init charlcd_probe()

in arm-charlcd.c [267:330]

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

static int __init charlcd_probe(struct platform_device *pdev)
{
	int ret;
	struct charlcd *lcd;
	struct resource *res;

	lcd = kzalloc(sizeof(struct charlcd), GFP_KERNEL);
	if (!lcd)
		return -ENOMEM;

	lcd->dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENOENT;
		goto out_no_resource;
	}
	lcd->phybase = res->start;
	lcd->physize = resource_size(res);

	if (request_mem_region(lcd->phybase, lcd->physize,
			       DRIVERNAME) == NULL) {
		ret = -EBUSY;
		goto out_no_memregion;
	}

	lcd->virtbase = ioremap(lcd->phybase, lcd->physize);
	if (!lcd->virtbase) {
		ret = -ENOMEM;
		goto out_no_memregion;
	}

	lcd->irq = platform_get_irq(pdev, 0);
	/* If no IRQ is supplied, we'll survive without it */
	if (lcd->irq >= 0) {
		if (request_irq(lcd->irq, charlcd_interrupt, 0,
				DRIVERNAME, lcd)) {
			ret = -EIO;
			goto out_no_irq;
		}
	}

	platform_set_drvdata(pdev, lcd);

	/*
	 * Initialize the display in a delayed work, because
	 * it is VERY slow and would slow down the boot of the system.
	 */
	INIT_DELAYED_WORK(&lcd->init_work, charlcd_init_work);
	schedule_delayed_work(&lcd->init_work, 0);

	dev_info(&pdev->dev, "initialized ARM character LCD at %08x\n",
		lcd->phybase);

	return 0;

out_no_irq:
	iounmap(lcd->virtbase);
out_no_memregion:
	release_mem_region(lcd->phybase, SZ_4K);
out_no_resource:
	kfree(lcd);
	return ret;
}