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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2022-06-10 15:02:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-10 16:01:55 +0200 |
| commit | 82b070beae1ef55b0049768c8dc91d87565bb191 (patch) | |
| tree | dc57dd5168c9bc4c2ade5e1db0503c0e9f7ae25a | |
| parent | 9cbffc7a59561be950ecc675d19a3d2b45202b2b (diff) | |
| download | linux-82b070beae1ef55b0049768c8dc91d87565bb191.tar.bz2 | |
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>
| -rw-r--r-- | drivers/base/core.c | 20 | ||||
| -rw-r--r-- | include/linux/device.h | 2 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 977b379a495b..839f64485a55 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 dc941997795c..424b55df0272 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); |