ACPI的forbidden_id_list

使用ACPI后，在driver/acpi/acpi_platform.c中会为bios 传过来的设备create device. 知道这个后，我们除了可以再grub中添加blacklist来禁止某个驱动外，还可以在driver/acpi/acpi_platform.c中的forbidden_id_list添加，这样kernel 就不会为这个设备创建device
在driver/acpi/acpi_platform.c 中已经禁止的device如下
static const struct acpi_device_id forbidden_id_list[] = {
	{"PNP0000",  0},	/* PIC */
	{"PNP0100",  0},	/* Timer */
	{"PNP0200",  0},	/* AT DMA Controller */
	{"ACPI0009", 0},	/* IOxAPIC */
	{"ACPI000A", 0},	/* IOAPIC */
	{"SMB0001",  0},	/* ACPI SMBUS virtual device */
	{"", 0},
};
我们可以将需要禁止的驱动的id放到这个list中，这样在
struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
					struct property_entry *properties)
{
	struct platform_device *pdev = NULL;
	struct platform_device_info pdevinfo;
	struct resource_entry *rentry;
	struct list_head resource_list;
	struct resource *resources = NULL;
	int count;

	/* If the ACPI node already has a physical device attached, skip it. */
	if (adev->physical_node_count)
		return NULL;
#检测到需要禁止的设备的id，就退出
	if (!acpi_match_device_ids(adev, forbidden_id_list))
		return ERR_PTR(-EINVAL);
}