5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> [ Upstream commit 82b070beae1ef55b0049768c8dc91d87565bb191 ] 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@xxxxxxxxx> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20220610120219.18988-1-andriy.shevchenko@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Stable-dep-of: 27aabf27fd01 ("Bluetooth: fix use-after-free in device_for_each_child()") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 b13a60de5a863..82eb25ad1c72e 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3419,6 +3419,26 @@ 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 9c9ce573c737f..d615719b19d4d 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -834,6 +834,8 @@ 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); -- 2.43.0
