ACPI: bus: Introduce acpi_dev_for_each_child()

mainline inclusion
from mainline-v5.19-rc
commit cf6ba075
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I67QNJ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=cf6ba0750a22a54f5101986401271429995cc4a0

--------------------------------------------

Introduce a wrapper around device_for_each_child() to iterate over
the children of a given ACPI device object.

This function will be used in subsequent change sets.
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NZhang Zekun <zhangzekun11@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>

drivers/acpi/bus.c

@@ -966,6 +966,12 @@ struct bus_type acpi_bus_type = {
 	.uevent		= acpi_device_uevent,
 };
 
+int acpi_dev_for_each_child(struct acpi_device *adev,
+			    int (*fn)(struct device *, void *), void *data)
+{
+	return device_for_each_child(&adev->dev, data, fn);
+}
+
 /* --------------------------------------------------------------------------
                              Initialization/Cleanup
    -------------------------------------------------------------------------- */

include/acpi/acpi_bus.h

@@ -494,6 +494,8 @@ void acpi_bus_detach_private_data(acpi_handle);
 extern int acpi_notifier_call_chain(struct acpi_device *, u32, u32);
 extern int register_acpi_notifier(struct notifier_block *);
 extern int unregister_acpi_notifier(struct notifier_block *);
+int acpi_dev_for_each_child(struct acpi_device *adev,
+			    int (*fn)(struct device *, void *), void *data);
 
 /*
  * External Functions