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ACPI / scan: Treat power resources in a special way

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Commit 805d410 (ACPI: Separate adding ACPI device objects from
probing ACPI drivers) introduced an ACPI power resources management
regression, because it didn't ensure that the power resources
driver bind to the struct acpi_device objects corresponding
to power resources as soon as they were created.  As a result,
ACPI power management routines may attempt to access power resource
objects before they are ready to use.

To fix this problem, tell the acpi_add_single_object() in
acpi_bus_check_add() to probe the driver for objects of type
ACPI_BUS_TYPE_POWER.  This fix has been verified to work on
HP nx6325 where the problem was first observed.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
This commit is contained in:
Rafael J. Wysocki 2013-01-07 21:17:02 +01:00
parent e0ebda2ee1
commit f95988de06
1 changed files with 2 additions and 1 deletions
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3
drivers/acpi/scan.c
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@ -1558,7 +1558,8 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
return AE_CTRL_DEPTH;
}
acpi_add_single_object(&device, handle, type, sta, false);
acpi_add_single_object(&device, handle, type, sta,
type == ACPI_BUS_TYPE_POWER);
if (!device)
return AE_CTRL_DEPTH;