On Monday, May 05, 2014 10:49:49 PM Igor Mammedov wrote:
> 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>
> Acked-by: Toshi Kani <toshi.kani@xxxxxx>
Would there be a problem if I applied this separately from the rest of the
series?
> ---
> v2:
> - fix regression in v1 leading to NULL pointer dereference
> on CPU unplug, do not remove "pr->dev = dev;"
> ---
> drivers/acpi/acpi_processor.c | 1 -
> 1 files changed, 0 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
> index b06f5f5..52c81c4 100644
> --- a/drivers/acpi/acpi_processor.c
> +++ b/drivers/acpi/acpi_processor.c
> @@ -405,7 +405,6 @@ static int acpi_processor_add(struct acpi_device *device,
> 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)
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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