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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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include/acpi/acpi_bus.h
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@@ -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