kernel-devel/module-basics/vain_pci/vain_pci_3.c


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	ret = pci_request_regions(pdev, "vain_pci");
	if (ret) {
		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n");
		goto err_disable_device;
	}

	info->base = pci_ioremap_bar(pdev, 0);
	if (!info->base) {
		dev_err(&pdev->dev, "Unable to map card MMIO\n");
		ret = -ENODEV;
		goto err_rel_regs;
	}

	pci_set_drvdata(pdev, info);

	return 0;