driver core: Introduce device_find_child().
Introduce device_find_child() to match device_for_each_child(). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -750,12 +750,45 @@ int device_for_each_child(struct device * parent, void * data,
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return error;
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}
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/**
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* device_find_child - device iterator for locating a particular device.
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* @parent: parent struct device
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* @data: Data to pass to match function
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* @match: Callback function to check device
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*
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* This is similar to the device_for_each_child() function above, but it
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* returns a reference to a device that is 'found' for later use, as
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* determined by the @match callback.
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*
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* The callback should return 0 if the device doesn't match and non-zero
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* if it does. If the callback returns non-zero and a reference to the
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* current device can be obtained, this function will return to the caller
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* and not iterate over any more devices.
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*/
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struct device * device_find_child(struct device *parent, void *data,
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int (*match)(struct device *, void *))
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{
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struct klist_iter i;
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struct device *child;
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if (!parent)
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return NULL;
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klist_iter_init(&parent->klist_children, &i);
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while ((child = next_device(&i)))
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if (match(child, data) && get_device(child))
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break;
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klist_iter_exit(&i);
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return child;
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}
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int __init devices_init(void)
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{
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return subsystem_register(&devices_subsys);
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}
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EXPORT_SYMBOL_GPL(device_for_each_child);
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EXPORT_SYMBOL_GPL(device_find_child);
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EXPORT_SYMBOL_GPL(device_initialize);
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EXPORT_SYMBOL_GPL(device_add);
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@ -421,6 +421,8 @@ extern int __must_check device_add(struct device * dev);
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extern void device_del(struct device * dev);
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extern int device_for_each_child(struct device *, void *,
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int (*fn)(struct device *, void *));
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extern struct device *device_find_child(struct device *, void *data,
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int (*match)(struct device *, void *));
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extern int device_rename(struct device *dev, char *new_name);
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/*
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