From 4c533c801d1c9b5c38458a0e7516e0cf50643782 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 18 Apr 2015 01:25:46 +0200 Subject: [PATCH] ACPI / scan: Annotate physical_node_lock in acpi_scan_is_offline() acpi_scan_is_offline() may be called under the physical_node_lock lock of the given device object's parent, so prevent lockdep from complaining about that by annotating that instance with SINGLE_DEPTH_NESTING. Fixes: caa73ea158de (ACPI / hotplug / driver core: Handle containers in a special way) Reported-and-tested-by: Xie XiuQi Reviewed-by: Toshi Kani Cc: 3.14+ # 3.14+ Signed-off-by: Rafael J. Wysocki --- drivers/acpi/scan.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 69bc0d8..8d40467 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -375,7 +375,11 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) 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) { -- 2.7.4