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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>
This commit is contained in:
Andy Shevchenko 2022-06-10 15:02:18 +03:00 committed by Greg Kroah-Hartman
parent 9cbffc7a59
commit 82b070beae
2 changed files with 22 additions and 0 deletions
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20
drivers/base/core.c
View File

@ -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);

2
include/linux/device.h
View File

@ -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);