acpi_processor_add() assumes that present at boot CPUs are always onlined, it is not so if a CPU failed to become onlined. As result acpi_processor_add() will mark such CPU device as onlined in sysfs and following attempts to online/offline it using /sys/device/system/cpu/cpuX/online attribute will fail. Do not poke into device internals in acpi_processor_add() and touch "struct device { .offline }" attribute, since for CPUs onlined at boot it's set by: topology_init() -> arch_register_cpu() -> register_cpu() before ACPI device tree is parsed, and for hotplugged CPUs it's set when userspace onlines CPU via sysfs. Signed-off-by: Igor Mammedov <imammedo@xxxxxxxxxx> --- drivers/acpi/acpi_processor.c | 3 --- 1 files changed, 0 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index c29c2c3..d56e4b4 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -403,9 +403,6 @@ static int acpi_processor_add(struct acpi_device *device, if (result) goto err; - pr->dev = dev; - dev->offline = pr->flags.need_hotplug_init; - /* Trigger the processor driver's .probe() if present. */ if (device_attach(dev) >= 0) return 1; -- 1.7.1 -- 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