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ACPI / PM: Register power resource devices as soon as they are needed

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Depending on the organization of the ACPI namespace, power resource
device objects may generally be scanned after the "regular" device
objects that they are referred from through _PRn.  This, in turn, may
cause acpi_bus_get_power_flags() to attempt to access them through
acpi_bus_init_power() before they are registered (and initialized by
acpi_power_driver).  [This is not a theoretical issue, it actually
happens for one PnP device on my testbed HP nx6325.]

To fix this problem, make acpi_bus_get_power_flags() attempt to
register power resource devices as soon as they have been found in
the _PRn output for any other devices.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki 2010-11-25 00:10:44 +01:00 committed by Len Brown
parent 97d9a9e9f5
commit bf325f9538
1 changed files with 20 additions and 0 deletions
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20
drivers/acpi/scan.c
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@ -847,6 +847,8 @@ end:
return 0;
}
static void acpi_bus_add_power_resource(acpi_handle handle);
static int acpi_bus_get_power_flags(struct acpi_device *device)
{
acpi_status status = 0;
@ -875,8 +877,12 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
acpi_evaluate_reference(device->handle, object_name, NULL,
&ps->resources);
if (ps->resources.count) {
int j;
device->power.flags.power_resources = 1;
ps->flags.valid = 1;
for (j = 0; j < ps->resources.count; j++)
acpi_bus_add_power_resource(ps->resources.handles[j]);
}
/* Evaluate "_PSx" to see if we can do explicit sets */
@ -1323,6 +1329,20 @@ end:
#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
static void acpi_bus_add_power_resource(acpi_handle handle)
{
struct acpi_bus_ops ops = {
.acpi_op_add = 1,
.acpi_op_start = 1,
};
struct acpi_device *device = NULL;
acpi_bus_get_device(handle, &device);
if (!device)
acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
ACPI_STA_DEFAULT, &ops);
}
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
unsigned long long *sta)
{