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ACPI: identify device tree root by null parent pointer, not ACPI_BUS_TYPE

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We can identify the root of the ACPI device tree by the fact that it
has no parent.  This is simpler than passing around ACPI_BUS_TYPE_SYSTEM
and will help remove special treatment of the device tree root.

Currently, we add the root by hand with ACPI_BUS_TYPE_SYSTEM.  If we
traverse the tree treating the root as just another device and use
acpi_get_type(), the root shows up as ACPI_TYPE_DEVICE.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2009-09-21 19:29:50 +00:00 committed by Len Brown
parent adc08e2035
commit 859ac9a4be
2 changed files with 13 additions and 8 deletions
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20
drivers/acpi/scan.c
View File

@ -22,6 +22,8 @@ extern struct acpi_device *acpi_root;
#define ACPI_BUS_HID "LNXSYBUS"
#define ACPI_BUS_DEVICE_NAME "System Bus"
#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
static LIST_HEAD(acpi_device_list);
static LIST_HEAD(acpi_bus_id_list);
DEFINE_MUTEX(acpi_device_lock);
@ -955,10 +957,12 @@ static void acpi_device_get_busid(struct acpi_device *device)
* The device's Bus ID is simply the object name.
* TBD: Shouldn't this value be unique (within the ACPI namespace)?
*/
switch (device->device_type) {
case ACPI_BUS_TYPE_SYSTEM:
if (ACPI_IS_ROOT_DEVICE(device)) {
strcpy(device->pnp.bus_id, "ACPI");
break;
return;
}
switch (device->device_type) {
case ACPI_BUS_TYPE_POWER_BUTTON:
strcpy(device->pnp.bus_id, "PWRF");
break;
@ -1093,6 +1097,11 @@ static void acpi_device_set_id(struct acpi_device *device)
switch (device->device_type) {
case ACPI_BUS_TYPE_DEVICE:
if (ACPI_IS_ROOT_DEVICE(device)) {
hid = ACPI_SYSTEM_HID;
break;
}
status = acpi_get_object_info(device->handle, &info);
if (ACPI_FAILURE(status)) {
printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
@ -1129,9 +1138,6 @@ static void acpi_device_set_id(struct acpi_device *device)
case ACPI_BUS_TYPE_PROCESSOR:
hid = ACPI_PROCESSOR_OBJECT_HID;
break;
case ACPI_BUS_TYPE_SYSTEM:
hid = ACPI_SYSTEM_HID;
break;
case ACPI_BUS_TYPE_THERMAL:
hid = ACPI_THERMAL_HID;
break;
@ -1643,7 +1649,7 @@ int __init acpi_scan_init(void)
* Create the root device in the bus's device tree
*/
result = acpi_add_single_object(&acpi_root, ACPI_ROOT_OBJECT,
ACPI_BUS_TYPE_SYSTEM, &ops);
ACPI_BUS_TYPE_DEVICE, &ops);
if (result)
goto Done;

1
include/acpi/acpi_bus.h
View File

@ -70,7 +70,6 @@ enum acpi_bus_device_type {
ACPI_BUS_TYPE_POWER,
ACPI_BUS_TYPE_PROCESSOR,
ACPI_BUS_TYPE_THERMAL,
ACPI_BUS_TYPE_SYSTEM,
ACPI_BUS_TYPE_POWER_BUTTON,
ACPI_BUS_TYPE_SLEEP_BUTTON,
ACPI_BUS_DEVICE_TYPE_COUNT