[PATCH v1 10/16] ACPI: bus: Introduce acpi_dev_for_each_child_reverse()

Rafael J. Wysocki
2022-06-09T14:21:54Z

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Make it possible to walk the children of an ACPI device in the revese
order by defining acpi_dev_for_each_child_reverse() in analogy with
acpi_dev_for_each_child().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/acpi/bus.c | 13 +++++++++++++
include/acpi/acpi_bus.h | 3 +++
2 files changed, 16 insertions(+)

Index: linux-pm/drivers/acpi/bus.c
===================================================================
--- linux-pm.orig/drivers/acpi/bus.c
+++ linux-pm/drivers/acpi/bus.c
@@ -1115,6 +1115,19 @@ int acpi_dev_for_each_child(struct acpi_
return device_for_each_child(&adev->dev, &adwc, acpi_dev_for_one_check);
}

+int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
+ int (*fn)(struct acpi_device *, void *),
+ void *data)
+{
+ struct acpi_dev_walk_context adwc = {
+ .fn = fn,
+ .data = data,
+ };
+
+ return device_for_each_child_reverse(&adev->dev, &adwc,
+ acpi_dev_for_one_check);
+}
+
/* --------------------------------------------------------------------------
Initialization/Cleanup
-------------------------------------------------------------------------- */
Index: linux-pm/include/acpi/acpi_bus.h
===================================================================
--- linux-pm.orig/include/acpi/acpi_bus.h
+++ linux-pm/include/acpi/acpi_bus.h
@@ -483,6 +483,9 @@ extern struct bus_type acpi_bus_type;
int acpi_bus_for_each_dev(int (*fn)(struct device *, void *), void *data);
int acpi_dev_for_each_child(struct acpi_device *adev,
int (*fn)(struct acpi_device *, void *), void *data);
+int acpi_dev_for_each_child_reverse(struct acpi_device *adev,
+ int (*fn)(struct acpi_device *, void *),
+ void *data);

/*
* Events