On Wednesday, March 22, 2017 09:01:48 AM Lee, Chun-Yi wrote:
> Just checking the state of container is not enough to confirm that
> the whole container is offlined.
And why is that so?
> Kernel should checks all children's
> offline state as the logic in acpi_container_offline().
>
> Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
> Cc: Len Brown <lenb@xxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Jiri Kosina <jkosina@xxxxxxx>
> Signed-off-by: "Lee, Chun-Yi" <jlee@xxxxxxxx>
> ---
> drivers/acpi/scan.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 1926918..f08ca31 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -260,13 +260,15 @@ static int acpi_scan_try_to_offline(struct acpi_device *device)
> static int acpi_scan_hot_remove(struct acpi_device *device)
> {
> acpi_handle handle = device->handle;
> + struct acpi_device *child;
> unsigned long long sta;
> acpi_status status;
>
> if (device->handler && device->handler->hotplug.demand_offline
> && !acpi_force_hot_remove) {
> - if (!acpi_scan_is_offline(device, true))
> - return -EBUSY;
> + list_for_each_entry(child, &device->children, node)
> + if (!acpi_scan_is_offline(child, false))
> + return -EBUSY;
> } else {
> int error = acpi_scan_try_to_offline(device);
> if (error)
>
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