From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Commit 1d57433 (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@xxxxxxxxx> --- The commit mentioned in the changelog is in linux-next only for now, but it's likely to go upstream in this form anyway and the fix on top of the whole ACPI scan series is trivial. Thanks, Rafael --- drivers/acpi/scan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux/drivers/acpi/scan.c =================================================================== --- linux.orig/drivers/acpi/scan.c +++ linux/drivers/acpi/scan.c @@ -1606,7 +1606,8 @@ static acpi_status acpi_bus_check_add(ac 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; -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
