Commit 97d9a9e9 authored Nov 25, 2010 by Rafael J. Wysocki Committed by Len Brown Jan 12, 2011

ACPI / PM: Register acpi_power_driver early



The ACPI device driver used for handling power resources,
acpi_power_driver, creates a struct acpi_power_resource object for
each ACPI device representing a power resource.  These objects are
then used when setting and reading the power states of devices using
the corresponding power resources.  Unfortunately, acpi_power_driver
is registered after acpi_scan_init() that may add devices using the
power resources before acpi_power_driver has a chance to create
struct acpi_power_resource objects for them (specifically, the power
resources may be referred to during the scanning process through
acpi_bus_get_power() before they have been initialized).

As the first step towards fixing this issue, move the registration
of acpi_power_driver into acpi_scan_init() so that power resource
devices can be initialized by it as soon as they have been found in
the namespace.

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

parent 25eed407

drivers/acpi/bus.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -1099,7 +1099,6 @@ static int __init acpi_init(void)

		acpi_scan_init();
		acpi_ec_init();
		acpi_power_init();
		acpi_debugfs_init();
		acpi_sleep_proc_init();
		acpi_wakeup_device_init();

drivers/acpi/scan.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1570,6 +1570,8 @@ int __init acpi_scan_init(void)
		printk(KERN_ERR PREFIX "Could not register bus type\n");
		}

		acpi_power_init();

		/*
		* Enumerate devices in the ACPI namespace.
		*/

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