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>

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 19decee72e923603ccadfd2f682472468ee1cdf6..47864013c0df783fb3ed8e2c718f2abe95b905ac 100644 (file)
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -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();

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index ef8e659771e107eacf9068563f060957bf6b4614..2951a27303cb7c454f9fc755ec7397df0ca3fb18 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -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.
         */