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driver core: Add helper device_find_child_by_name() 

It looks like the child device is often matched with a name.
This introduces a helper that does it automatically.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
alistair/sunxi64-5.4-dsi
Heikki Krogerus 2019-05-31 17:15:37 +03:00 committed by Rafael J. Wysocki
parent b06184acf7
commit dad9bb0178
2 changed files with 30 additions and 0 deletions
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28
drivers/base/core.c
View File

@ -2474,6 +2474,34 @@ struct device *device_find_child(struct device *parent, void *data,
}
EXPORT_SYMBOL_GPL(device_find_child);
/**
* device_find_child_by_name - device iterator for locating a child device.
* @parent: parent struct device
* @name: name of the child device
*
* This is similar to the device_find_child() function above, but it
* returns a reference to a device that has the name @name.
*
* NOTE: you will need to drop the reference with put_device() after use.
*/
struct device *device_find_child_by_name(struct device *parent,
const char *name)
{
struct klist_iter i;
struct device *child;
if (!parent)
return NULL;
klist_iter_init(&parent->p->klist_children, &i);
while ((child = next_device(&i)))
if (!strcmp(dev_name(child), name) && get_device(child))
break;
klist_iter_exit(&i);
return child;
}
EXPORT_SYMBOL_GPL(device_find_child_by_name);
int __init devices_init(void)
{
devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);

2
include/linux/device.h
View File

@ -1250,6 +1250,8 @@ extern int device_for_each_child_reverse(struct device *dev, void *data,
int (*fn)(struct device *dev, void *data));
extern struct device *device_find_child(struct device *dev, void *data,
int (*match)(struct device *dev, void *data));
extern struct device *device_find_child_by_name(struct device *parent,
const char *name);
extern int device_rename(struct device *dev, const char *new_name);
extern int device_move(struct device *dev, struct device *new_parent,
enum dpm_order dpm_order);