ACPI: cleanups for hotplug

I'm working to make the Linux/ACPI code handle hotplug notification events. This should ultimately allow us to remove the existing hotplug code scattered through the ACPI device drivers.

This is a long series of cleanups that should cause no functional change, but will make it easier to call acpi_bus_scan() from the notification path.

Comments and testing reports welcome. Boot logs with CONFIG_ACPI_DEBUG=y and "acpi.debug_layer=0x00010000" will be helpful in debugging any issues.

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Bjorn Helgaas (19):
ACPI: simplify deferred execution path
ACPI: remove null pointer checks in deferred execution path
ACPI: don't pass handle for fixed hardware notifications
ACPI: add debug for device addition
ACPI: remove unused acpi_bus_scan_fixed() argument
ACPI: remove redundant "handle" and "parent" arguments
ACPI: save device_type in acpi_device
ACPI: use device_type rather than comparing HID
ACPI: remove acpi_device_set_context() "type" argument
ACPI: remove redundant "type" arguments
ACPI: remove unnecessary argument checking
ACPI: add acpi_bus_get_parent() and remove "parent" arguments
ACPI: convert acpi_bus_scan() to operate on an acpi_handle
ACPI: enumerate namespace before adding functional fixed hardware devices
ACPI: identify device tree root by null parent pointer, not ACPI_BUS_TYPE
ACPI: use acpi_walk_namespace() to enumerate devices
ACPI: add acpi_bus_get_status_handle()
ACPI: factor out device type and status checking
ACPI: handle re-enumeration, when acpi_devices might already exist

 drivers/acpi/bus.c      |   49 ++---
 drivers/acpi/osl.c      |   32 +---
 drivers/acpi/scan.c     |  428 +++++++++++++++++++++--------------------------
 include/acpi/acpi_bus.h |    6 -
 4 files changed, 221 insertions(+), 294 deletions(-)

Bjorn