On 2015/4/11 7:31, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> acpi_scan_is_offline() may be called under the physical_node_lock
> of the given device object's parent, so prevent lockdep from
> complaining about that by annotating that instance with
> SINGLE_DEPTH_NESTING.
>
> Reported-by: Xie XiuQi <xiexiuqi@xxxxxxxxxx>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Tested-by: Xie XiuQi <xiexiuqi@xxxxxxxxxx>
Thanks,
Xie XiuQi
> ---
> drivers/acpi/scan.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> Index: linux-pm/drivers/acpi/scan.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/scan.c
> +++ linux-pm/drivers/acpi/scan.c
> @@ -298,7 +298,11 @@ bool acpi_scan_is_offline(struct acpi_de
> struct acpi_device_physical_node *pn;
> bool offline = true;
>
> - mutex_lock(&adev->physical_node_lock);
> + /*
> + * acpi_container_offline() calls this for all of the container's
> + * children under the container's physical_node_lock lock.
> + */
> + mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
>
> list_for_each_entry(pn, &adev->physical_node_list, node)
> if (device_supports_offline(pn->dev) && !pn->dev->offline) {
>
>
> .
>
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