2 * drivers/base/core.c - core driver model code (device registration, etc)
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
6 * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de>
7 * Copyright (c) 2006 Novell, Inc.
9 * This file is released under the GPLv2
13 #include <linux/device.h>
14 #include <linux/err.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/kdev_t.h>
20 #include <linux/notifier.h>
22 #include <asm/semaphore.h>
25 #include "power/power.h"
27 int (*platform_notify)(struct device * dev) = NULL;
28 int (*platform_notify_remove)(struct device * dev) = NULL;
31 * sysfs bindings for devices.
35 * dev_driver_string - Return a device's driver name, if at all possible
36 * @dev: struct device to get the name of
38 * Will return the device's driver's name if it is bound to a device. If
39 * the device is not bound to a device, it will return the name of the bus
40 * it is attached to. If it is not attached to a bus either, an empty
41 * string will be returned.
43 const char *dev_driver_string(struct device *dev)
45 return dev->driver ? dev->driver->name :
46 (dev->bus ? dev->bus->name : "");
48 EXPORT_SYMBOL(dev_driver_string);
50 #define to_dev(obj) container_of(obj, struct device, kobj)
51 #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
54 dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
56 struct device_attribute * dev_attr = to_dev_attr(attr);
57 struct device * dev = to_dev(kobj);
61 ret = dev_attr->show(dev, dev_attr, buf);
66 dev_attr_store(struct kobject * kobj, struct attribute * attr,
67 const char * buf, size_t count)
69 struct device_attribute * dev_attr = to_dev_attr(attr);
70 struct device * dev = to_dev(kobj);
74 ret = dev_attr->store(dev, dev_attr, buf, count);
78 static struct sysfs_ops dev_sysfs_ops = {
79 .show = dev_attr_show,
80 .store = dev_attr_store,
85 * device_release - free device structure.
86 * @kobj: device's kobject.
88 * This is called once the reference count for the object
89 * reaches 0. We forward the call to the device's release
90 * method, which should handle actually freeing the structure.
92 static void device_release(struct kobject * kobj)
94 struct device * dev = to_dev(kobj);
98 else if (dev->class && dev->class->dev_release)
99 dev->class->dev_release(dev);
101 printk(KERN_ERR "Device '%s' does not have a release() function, "
102 "it is broken and must be fixed.\n",
108 static struct kobj_type ktype_device = {
109 .release = device_release,
110 .sysfs_ops = &dev_sysfs_ops,
114 static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
116 struct kobj_type *ktype = get_ktype(kobj);
118 if (ktype == &ktype_device) {
119 struct device *dev = to_dev(kobj);
128 static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
130 struct device *dev = to_dev(kobj);
133 return dev->bus->name;
135 return dev->class->name;
139 static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp,
140 int num_envp, char *buffer, int buffer_size)
142 struct device *dev = to_dev(kobj);
147 /* add the major/minor if present */
148 if (MAJOR(dev->devt)) {
149 add_uevent_var(envp, num_envp, &i,
150 buffer, buffer_size, &length,
151 "MAJOR=%u", MAJOR(dev->devt));
152 add_uevent_var(envp, num_envp, &i,
153 buffer, buffer_size, &length,
154 "MINOR=%u", MINOR(dev->devt));
158 add_uevent_var(envp, num_envp, &i,
159 buffer, buffer_size, &length,
160 "DRIVER=%s", dev->driver->name);
162 #ifdef CONFIG_SYSFS_DEPRECATED
164 struct device *parent = dev->parent;
166 /* find first bus device in parent chain */
167 while (parent && !parent->bus)
168 parent = parent->parent;
169 if (parent && parent->bus) {
172 path = kobject_get_path(&parent->kobj, GFP_KERNEL);
173 add_uevent_var(envp, num_envp, &i,
174 buffer, buffer_size, &length,
175 "PHYSDEVPATH=%s", path);
178 add_uevent_var(envp, num_envp, &i,
179 buffer, buffer_size, &length,
180 "PHYSDEVBUS=%s", parent->bus->name);
183 add_uevent_var(envp, num_envp, &i,
184 buffer, buffer_size, &length,
185 "PHYSDEVDRIVER=%s", parent->driver->name);
187 } else if (dev->bus) {
188 add_uevent_var(envp, num_envp, &i,
189 buffer, buffer_size, &length,
190 "PHYSDEVBUS=%s", dev->bus->name);
193 add_uevent_var(envp, num_envp, &i,
194 buffer, buffer_size, &length,
195 "PHYSDEVDRIVER=%s", dev->driver->name);
199 /* terminate, set to next free slot, shrink available space */
203 buffer = &buffer[length];
204 buffer_size -= length;
206 if (dev->bus && dev->bus->uevent) {
207 /* have the bus specific function add its stuff */
208 retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size);
210 pr_debug ("%s - uevent() returned %d\n",
211 __FUNCTION__, retval);
215 if (dev->class && dev->class->dev_uevent) {
216 /* have the class specific function add its stuff */
217 retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size);
219 pr_debug("%s - dev_uevent() returned %d\n",
220 __FUNCTION__, retval);
227 static struct kset_uevent_ops device_uevent_ops = {
228 .filter = dev_uevent_filter,
229 .name = dev_uevent_name,
230 .uevent = dev_uevent,
233 static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
234 const char *buf, size_t count)
236 kobject_uevent(&dev->kobj, KOBJ_ADD);
240 static int device_add_groups(struct device *dev)
246 for (i = 0; dev->groups[i]; i++) {
247 error = sysfs_create_group(&dev->kobj, dev->groups[i]);
250 sysfs_remove_group(&dev->kobj, dev->groups[i]);
259 static void device_remove_groups(struct device *dev)
263 for (i = 0; dev->groups[i]; i++) {
264 sysfs_remove_group(&dev->kobj, dev->groups[i]);
269 static int device_add_attrs(struct device *dev)
271 struct class *class = dev->class;
278 if (class->dev_attrs) {
279 for (i = 0; attr_name(class->dev_attrs[i]); i++) {
280 error = device_create_file(dev, &class->dev_attrs[i]);
287 device_remove_file(dev, &class->dev_attrs[i]);
291 static void device_remove_attrs(struct device *dev)
293 struct class *class = dev->class;
299 if (class->dev_attrs) {
300 for (i = 0; attr_name(class->dev_attrs[i]); i++)
301 device_remove_file(dev, &class->dev_attrs[i]);
306 static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
309 return print_dev_t(buf, dev->devt);
313 * devices_subsys - structure to be registered with kobject core.
316 decl_subsys(devices, &ktype_device, &device_uevent_ops);
320 * device_create_file - create sysfs attribute file for device.
322 * @attr: device attribute descriptor.
325 int device_create_file(struct device * dev, struct device_attribute * attr)
328 if (get_device(dev)) {
329 error = sysfs_create_file(&dev->kobj, &attr->attr);
336 * device_remove_file - remove sysfs attribute file.
338 * @attr: device attribute descriptor.
341 void device_remove_file(struct device * dev, struct device_attribute * attr)
343 if (get_device(dev)) {
344 sysfs_remove_file(&dev->kobj, &attr->attr);
350 * device_create_bin_file - create sysfs binary attribute file for device.
352 * @attr: device binary attribute descriptor.
354 int device_create_bin_file(struct device *dev, struct bin_attribute *attr)
358 error = sysfs_create_bin_file(&dev->kobj, attr);
361 EXPORT_SYMBOL_GPL(device_create_bin_file);
364 * device_remove_bin_file - remove sysfs binary attribute file
366 * @attr: device binary attribute descriptor.
368 void device_remove_bin_file(struct device *dev, struct bin_attribute *attr)
371 sysfs_remove_bin_file(&dev->kobj, attr);
373 EXPORT_SYMBOL_GPL(device_remove_bin_file);
375 static void klist_children_get(struct klist_node *n)
377 struct device *dev = container_of(n, struct device, knode_parent);
382 static void klist_children_put(struct klist_node *n)
384 struct device *dev = container_of(n, struct device, knode_parent);
391 * device_initialize - init device structure.
394 * This prepares the device for use by other layers,
395 * including adding it to the device hierarchy.
396 * It is the first half of device_register(), if called by
397 * that, though it can also be called separately, so one
398 * may use @dev's fields (e.g. the refcount).
401 void device_initialize(struct device *dev)
403 kobj_set_kset_s(dev, devices_subsys);
404 kobject_init(&dev->kobj);
405 klist_init(&dev->klist_children, klist_children_get,
407 INIT_LIST_HEAD(&dev->dma_pools);
408 INIT_LIST_HEAD(&dev->node);
409 init_MUTEX(&dev->sem);
410 device_init_wakeup(dev, 0);
411 set_dev_node(dev, -1);
414 #ifdef CONFIG_SYSFS_DEPRECATED
415 static struct kobject * get_device_parent(struct device *dev,
416 struct device *parent)
418 /* Set the parent to the class, not the parent device */
419 /* this keeps sysfs from having a symlink to make old udevs happy */
421 return &dev->class->subsys.kset.kobj;
423 return &parent->kobj;
428 static struct kobject * virtual_device_parent(struct device *dev)
431 return ERR_PTR(-ENODEV);
433 if (!dev->class->virtual_dir) {
434 static struct kobject *virtual_dir = NULL;
437 virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual");
438 dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name);
441 return dev->class->virtual_dir;
444 static struct kobject * get_device_parent(struct device *dev,
445 struct device *parent)
447 /* if this is a class device, and has no parent, create one */
448 if ((dev->class) && (parent == NULL)) {
449 return virtual_device_parent(dev);
451 return &parent->kobj;
456 static int setup_parent(struct device *dev, struct device *parent)
458 struct kobject *kobj;
459 kobj = get_device_parent(dev, parent);
461 return PTR_ERR(kobj);
463 dev->kobj.parent = kobj;
468 * device_add - add device to device hierarchy.
471 * This is part 2 of device_register(), though may be called
472 * separately _iff_ device_initialize() has been called separately.
474 * This adds it to the kobject hierarchy via kobject_add(), adds it
475 * to the global and sibling lists for the device, then
476 * adds it to the other relevant subsystems of the driver model.
478 int device_add(struct device *dev)
480 struct device *parent = NULL;
481 char *class_name = NULL;
482 struct class_interface *class_intf;
485 dev = get_device(dev);
486 if (!dev || !strlen(dev->bus_id))
489 pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);
491 parent = get_device(dev->parent);
493 error = setup_parent(dev, parent);
497 /* first, register with generic layer. */
498 kobject_set_name(&dev->kobj, "%s", dev->bus_id);
499 error = kobject_add(&dev->kobj);
503 /* notify platform of device entry */
505 platform_notify(dev);
507 /* notify clients of device entry (new way) */
509 blocking_notifier_call_chain(&dev->bus->bus_notifier,
510 BUS_NOTIFY_ADD_DEVICE, dev);
512 dev->uevent_attr.attr.name = "uevent";
513 dev->uevent_attr.attr.mode = S_IWUSR;
515 dev->uevent_attr.attr.owner = dev->driver->owner;
516 dev->uevent_attr.store = store_uevent;
517 error = device_create_file(dev, &dev->uevent_attr);
521 if (MAJOR(dev->devt)) {
522 struct device_attribute *attr;
523 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
526 goto ueventattrError;
528 attr->attr.name = "dev";
529 attr->attr.mode = S_IRUGO;
531 attr->attr.owner = dev->driver->owner;
532 attr->show = show_dev;
533 error = device_create_file(dev, attr);
536 goto ueventattrError;
539 dev->devt_attr = attr;
543 sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj,
545 /* If this is not a "fake" compatible device, then create the
546 * symlink from the class to the device. */
547 if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
548 sysfs_create_link(&dev->class->subsys.kset.kobj,
549 &dev->kobj, dev->bus_id);
550 #ifdef CONFIG_SYSFS_DEPRECATED
552 sysfs_create_link(&dev->kobj, &dev->parent->kobj,
554 class_name = make_class_name(dev->class->name,
557 sysfs_create_link(&dev->parent->kobj,
558 &dev->kobj, class_name);
563 if ((error = device_add_attrs(dev)))
565 if ((error = device_add_groups(dev)))
567 if ((error = device_pm_add(dev)))
569 if ((error = bus_add_device(dev)))
571 kobject_uevent(&dev->kobj, KOBJ_ADD);
572 if ((error = bus_attach_device(dev)))
575 klist_add_tail(&dev->knode_parent, &parent->klist_children);
578 down(&dev->class->sem);
579 /* tie the class to the device */
580 list_add_tail(&dev->node, &dev->class->devices);
582 /* notify any interfaces that the device is here */
583 list_for_each_entry(class_intf, &dev->class->interfaces, node)
584 if (class_intf->add_dev)
585 class_intf->add_dev(dev, class_intf);
586 up(&dev->class->sem);
593 bus_remove_device(dev);
595 device_pm_remove(dev);
598 blocking_notifier_call_chain(&dev->bus->bus_notifier,
599 BUS_NOTIFY_DEL_DEVICE, dev);
600 device_remove_groups(dev);
602 device_remove_attrs(dev);
604 if (dev->devt_attr) {
605 device_remove_file(dev, dev->devt_attr);
606 kfree(dev->devt_attr);
609 device_remove_file(dev, &dev->uevent_attr);
611 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
612 kobject_del(&dev->kobj);
621 * device_register - register a device with the system.
622 * @dev: pointer to the device structure
624 * This happens in two clean steps - initialize the device
625 * and add it to the system. The two steps can be called
626 * separately, but this is the easiest and most common.
627 * I.e. you should only call the two helpers separately if
628 * have a clearly defined need to use and refcount the device
629 * before it is added to the hierarchy.
632 int device_register(struct device *dev)
634 device_initialize(dev);
635 return device_add(dev);
640 * get_device - increment reference count for device.
643 * This simply forwards the call to kobject_get(), though
644 * we do take care to provide for the case that we get a NULL
648 struct device * get_device(struct device * dev)
650 return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
655 * put_device - decrement reference count.
656 * @dev: device in question.
658 void put_device(struct device * dev)
661 kobject_put(&dev->kobj);
666 * device_del - delete device from system.
669 * This is the first part of the device unregistration
670 * sequence. This removes the device from the lists we control
671 * from here, has it removed from the other driver model
672 * subsystems it was added to in device_add(), and removes it
673 * from the kobject hierarchy.
675 * NOTE: this should be called manually _iff_ device_add() was
676 * also called manually.
679 void device_del(struct device * dev)
681 struct device * parent = dev->parent;
682 struct class_interface *class_intf;
685 klist_del(&dev->knode_parent);
686 if (dev->devt_attr) {
687 device_remove_file(dev, dev->devt_attr);
688 kfree(dev->devt_attr);
691 sysfs_remove_link(&dev->kobj, "subsystem");
692 /* If this is not a "fake" compatible device, remove the
693 * symlink from the class to the device. */
694 if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
695 sysfs_remove_link(&dev->class->subsys.kset.kobj,
697 #ifdef CONFIG_SYSFS_DEPRECATED
699 char *class_name = make_class_name(dev->class->name,
702 sysfs_remove_link(&dev->parent->kobj,
705 sysfs_remove_link(&dev->kobj, "device");
709 down(&dev->class->sem);
710 /* notify any interfaces that the device is now gone */
711 list_for_each_entry(class_intf, &dev->class->interfaces, node)
712 if (class_intf->remove_dev)
713 class_intf->remove_dev(dev, class_intf);
714 /* remove the device from the class list */
715 list_del_init(&dev->node);
716 up(&dev->class->sem);
718 device_remove_file(dev, &dev->uevent_attr);
719 device_remove_groups(dev);
720 device_remove_attrs(dev);
721 bus_remove_device(dev);
723 /* Notify the platform of the removal, in case they
724 * need to do anything...
726 if (platform_notify_remove)
727 platform_notify_remove(dev);
729 blocking_notifier_call_chain(&dev->bus->bus_notifier,
730 BUS_NOTIFY_DEL_DEVICE, dev);
731 device_pm_remove(dev);
732 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
733 kobject_del(&dev->kobj);
739 * device_unregister - unregister device from system.
740 * @dev: device going away.
742 * We do this in two parts, like we do device_register(). First,
743 * we remove it from all the subsystems with device_del(), then
744 * we decrement the reference count via put_device(). If that
745 * is the final reference count, the device will be cleaned up
746 * via device_release() above. Otherwise, the structure will
747 * stick around until the final reference to the device is dropped.
749 void device_unregister(struct device * dev)
751 pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id);
757 static struct device * next_device(struct klist_iter * i)
759 struct klist_node * n = klist_next(i);
760 return n ? container_of(n, struct device, knode_parent) : NULL;
764 * device_for_each_child - device child iterator.
765 * @parent: parent struct device.
766 * @data: data for the callback.
767 * @fn: function to be called for each device.
769 * Iterate over @parent's child devices, and call @fn for each,
772 * We check the return of @fn each time. If it returns anything
773 * other than 0, we break out and return that value.
775 int device_for_each_child(struct device * parent, void * data,
776 int (*fn)(struct device *, void *))
779 struct device * child;
782 klist_iter_init(&parent->klist_children, &i);
783 while ((child = next_device(&i)) && !error)
784 error = fn(child, data);
790 * device_find_child - device iterator for locating a particular device.
791 * @parent: parent struct device
792 * @data: Data to pass to match function
793 * @match: Callback function to check device
795 * This is similar to the device_for_each_child() function above, but it
796 * returns a reference to a device that is 'found' for later use, as
797 * determined by the @match callback.
799 * The callback should return 0 if the device doesn't match and non-zero
800 * if it does. If the callback returns non-zero and a reference to the
801 * current device can be obtained, this function will return to the caller
802 * and not iterate over any more devices.
804 struct device * device_find_child(struct device *parent, void *data,
805 int (*match)(struct device *, void *))
808 struct device *child;
813 klist_iter_init(&parent->klist_children, &i);
814 while ((child = next_device(&i)))
815 if (match(child, data) && get_device(child))
821 int __init devices_init(void)
823 return subsystem_register(&devices_subsys);
826 EXPORT_SYMBOL_GPL(device_for_each_child);
827 EXPORT_SYMBOL_GPL(device_find_child);
829 EXPORT_SYMBOL_GPL(device_initialize);
830 EXPORT_SYMBOL_GPL(device_add);
831 EXPORT_SYMBOL_GPL(device_register);
833 EXPORT_SYMBOL_GPL(device_del);
834 EXPORT_SYMBOL_GPL(device_unregister);
835 EXPORT_SYMBOL_GPL(get_device);
836 EXPORT_SYMBOL_GPL(put_device);
838 EXPORT_SYMBOL_GPL(device_create_file);
839 EXPORT_SYMBOL_GPL(device_remove_file);
842 static void device_create_release(struct device *dev)
844 pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id);
849 * device_create - creates a device and registers it with sysfs
850 * @class: pointer to the struct class that this device should be registered to
851 * @parent: pointer to the parent struct device of this new device, if any
852 * @devt: the dev_t for the char device to be added
853 * @fmt: string for the device's name
855 * This function can be used by char device classes. A struct device
856 * will be created in sysfs, registered to the specified class.
858 * A "dev" file will be created, showing the dev_t for the device, if
859 * the dev_t is not 0,0.
860 * If a pointer to a parent struct device is passed in, the newly created
861 * struct device will be a child of that device in sysfs.
862 * The pointer to the struct device will be returned from the call.
863 * Any further sysfs files that might be required can be created using this
866 * Note: the struct class passed to this function must have previously
867 * been created with a call to class_create().
869 struct device *device_create(struct class *class, struct device *parent,
870 dev_t devt, const char *fmt, ...)
873 struct device *dev = NULL;
874 int retval = -ENODEV;
876 if (class == NULL || IS_ERR(class))
879 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
887 dev->parent = parent;
888 dev->release = device_create_release;
891 vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
893 retval = device_register(dev);
901 return ERR_PTR(retval);
903 EXPORT_SYMBOL_GPL(device_create);
906 * device_destroy - removes a device that was created with device_create()
907 * @class: pointer to the struct class that this device was registered with
908 * @devt: the dev_t of the device that was previously registered
910 * This call unregisters and cleans up a device that was created with a
911 * call to device_create().
913 void device_destroy(struct class *class, dev_t devt)
915 struct device *dev = NULL;
916 struct device *dev_tmp;
919 list_for_each_entry(dev_tmp, &class->devices, node) {
920 if (dev_tmp->devt == devt) {
928 device_unregister(dev);
930 EXPORT_SYMBOL_GPL(device_destroy);
933 * device_rename - renames a device
934 * @dev: the pointer to the struct device to be renamed
935 * @new_name: the new name of the device
937 int device_rename(struct device *dev, char *new_name)
939 char *old_class_name = NULL;
940 char *new_class_name = NULL;
941 char *old_symlink_name = NULL;
944 dev = get_device(dev);
948 pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name);
950 #ifdef CONFIG_SYSFS_DEPRECATED
951 if ((dev->class) && (dev->parent))
952 old_class_name = make_class_name(dev->class->name, &dev->kobj);
956 old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
957 if (!old_symlink_name) {
959 goto out_free_old_class;
961 strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE);
964 strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
966 error = kobject_rename(&dev->kobj, new_name);
968 #ifdef CONFIG_SYSFS_DEPRECATED
969 if (old_class_name) {
970 new_class_name = make_class_name(dev->class->name, &dev->kobj);
971 if (new_class_name) {
972 sysfs_create_link(&dev->parent->kobj, &dev->kobj,
974 sysfs_remove_link(&dev->parent->kobj, old_class_name);
980 sysfs_remove_link(&dev->class->subsys.kset.kobj,
982 sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj,
987 kfree(new_class_name);
988 kfree(old_symlink_name);
990 kfree(old_class_name);
996 static int device_move_class_links(struct device *dev,
997 struct device *old_parent,
998 struct device *new_parent)
1000 #ifdef CONFIG_SYSFS_DEPRECATED
1004 class_name = make_class_name(dev->class->name, &dev->kobj);
1010 sysfs_remove_link(&dev->kobj, "device");
1011 sysfs_remove_link(&old_parent->kobj, class_name);
1014 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1018 error = sysfs_create_link(&new_parent->kobj, &dev->kobj,
1021 sysfs_remove_link(&dev->kobj, "device");
1034 * device_move - moves a device to a new parent
1035 * @dev: the pointer to the struct device to be moved
1036 * @new_parent: the new parent of the device (can by NULL)
1038 int device_move(struct device *dev, struct device *new_parent)
1041 struct device *old_parent;
1042 struct kobject *new_parent_kobj;
1044 dev = get_device(dev);
1048 new_parent = get_device(new_parent);
1049 new_parent_kobj = get_device_parent (dev, new_parent);
1050 if (IS_ERR(new_parent_kobj)) {
1051 error = PTR_ERR(new_parent_kobj);
1052 put_device(new_parent);
1055 pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id,
1056 new_parent ? new_parent->bus_id : "<NULL>");
1057 error = kobject_move(&dev->kobj, new_parent_kobj);
1059 put_device(new_parent);
1062 old_parent = dev->parent;
1063 dev->parent = new_parent;
1065 klist_remove(&dev->knode_parent);
1067 klist_add_tail(&dev->knode_parent, &new_parent->klist_children);
1070 error = device_move_class_links(dev, old_parent, new_parent);
1072 /* We ignore errors on cleanup since we're hosed anyway... */
1073 device_move_class_links(dev, new_parent, old_parent);
1074 if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
1076 klist_remove(&dev->knode_parent);
1078 klist_add_tail(&dev->knode_parent,
1079 &old_parent->klist_children);
1081 put_device(new_parent);
1085 put_device(old_parent);
1091 EXPORT_SYMBOL_GPL(device_move);