From 82b070beae1ef55b0049768c8dc91d87565bb191 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Fri, 10 Jun 2022 15:02:18 +0300
Subject: [PATCH] driver core: Introduce device_find_any_child() helper
There are several places in the kernel where this kind of functionality is
being used. Provide a generic helper for such cases.
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220610120219.18988-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/base/core.c | 20 ++++++++++++++++++++
include/linux/device.h | 2 ++
2 files changed, 22 insertions(+)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 977b379a495b8..839f64485a555 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3920,6 +3920,26 @@ struct device *device_find_child_by_name(struct device *parent,
}
EXPORT_SYMBOL_GPL(device_find_child_by_name);
+static int match_any(struct device *dev, void *unused)
+{
+ return 1;
+}
+
+/**
+ * device_find_any_child - device iterator for locating a child device, if any.
+ * @parent: parent struct device
+ *
+ * This is similar to the device_find_child() function above, but it
+ * returns a reference to a child device, if any.
+ *
+ * NOTE: you will need to drop the reference with put_device() after use.
+ */
+struct device *device_find_any_child(struct device *parent)
+{
+ return device_find_child(parent, NULL, match_any);
+}
+EXPORT_SYMBOL_GPL(device_find_any_child);
+
int __init devices_init(void)
{
devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
diff --git a/include/linux/device.h b/include/linux/device.h
index dc941997795cf..424b55df02727 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -905,6 +905,8 @@ struct device *device_find_child(struct device *dev, void *data,
int (*match)(struct device *dev, void *data));
struct device *device_find_child_by_name(struct device *parent,
const char *name);
+struct device *device_find_any_child(struct device *parent);
+
int device_rename(struct device *dev, const char *new_name);
int device_move(struct device *dev, struct device *new_parent,
enum dpm_order dpm_order);
--
2.30.2