From: Rafael J. Wysocki <rjw@sisk.pl>
Date: Wed, 24 Nov 2010 23:09:15 +0000 (+0100)
Subject: ACPI / PM: Add function for updating device power state consistently
X-Git-Tag: v2.6.38-rc1~68^2~20^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25eed40720fc9005c63a1f436e5f8a78836c26ff;p=pandora-kernel.git

ACPI / PM: Add function for updating device power state consistently

Add function acpi_bus_update_power() for reading the actual power
state of an ACPI device and updating its device->power.state field
in such a way that its power resources' reference counters will
remain consistent with that field.

For this purpose introduce __acpi_bus_set_power() setting the
power state of an ACPI device without updating its
device->power.state field and make acpi_bus_set_power() and
acpi_bus_update_power() use it (acpi_bus_set_power() retains the
current behavior for now).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
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