kernel-devel/module-basics/vain_plat/vain_plat_2.c


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static int __devinit vain_plat_probe(struct platform_device *pdev)
{
	struct vain_plat_info *info;
	struct resource *res, *mem;
	int err;

	info = kzalloc(sizeof(struct vain_plat_info), GFP_KERNEL);
	if (unlikely(!info)) {
		dev_err(&pdev->dev, "Could not allocate memory\n");
		err = -ENOMEM;
		goto out;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (unlikely(!res)) {
		dev_err(&pdev->dev, "I/O address already in use\n");
		err = -ENOENT;
		goto err_free;
	}

	mem = request_mem_region(res->start, resource_size(res), pdev->name);
	if (!mem) {
		err = -EBUSY;
		goto err_free;
	}