1 // SPDX-License-Identifier: GPL-2.0
3 * Software nodes for the firmware node framework.
5 * Copyright (C) 2018, Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
9 #include <linux/device.h>
10 #include <linux/kernel.h>
11 #include <linux/property.h>
12 #include <linux/slab.h>
18 struct fwnode_handle fwnode;
19 const struct software_node *node;
24 struct list_head entry;
25 struct list_head children;
26 struct swnode *parent;
28 unsigned int allocated:1;
29 unsigned int managed:1;
32 static DEFINE_IDA(swnode_root_ids);
33 static struct kset *swnode_kset;
35 #define kobj_to_swnode(_kobj_) container_of(_kobj_, struct swnode, kobj)
37 static const struct fwnode_operations software_node_ops;
39 bool is_software_node(const struct fwnode_handle *fwnode)
41 return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &software_node_ops;
43 EXPORT_SYMBOL_GPL(is_software_node);
45 #define to_swnode(__fwnode) \
47 typeof(__fwnode) __to_swnode_fwnode = __fwnode; \
49 is_software_node(__to_swnode_fwnode) ? \
50 container_of(__to_swnode_fwnode, \
51 struct swnode, fwnode) : NULL; \
54 static inline struct swnode *dev_to_swnode(struct device *dev)
56 struct fwnode_handle *fwnode = dev_fwnode(dev);
61 if (!is_software_node(fwnode))
62 fwnode = fwnode->secondary;
64 return to_swnode(fwnode);
67 static struct swnode *
68 software_node_to_swnode(const struct software_node *node)
70 struct swnode *swnode = NULL;
76 spin_lock(&swnode_kset->list_lock);
78 list_for_each_entry(k, &swnode_kset->list, entry) {
79 swnode = kobj_to_swnode(k);
80 if (swnode->node == node)
85 spin_unlock(&swnode_kset->list_lock);
90 const struct software_node *to_software_node(const struct fwnode_handle *fwnode)
92 const struct swnode *swnode = to_swnode(fwnode);
94 return swnode ? swnode->node : NULL;
96 EXPORT_SYMBOL_GPL(to_software_node);
98 struct fwnode_handle *software_node_fwnode(const struct software_node *node)
100 struct swnode *swnode = software_node_to_swnode(node);
102 return swnode ? &swnode->fwnode : NULL;
104 EXPORT_SYMBOL_GPL(software_node_fwnode);
106 /* -------------------------------------------------------------------------- */
107 /* property_entry processing */
109 static const struct property_entry *
110 property_entry_get(const struct property_entry *prop, const char *name)
115 for (; prop->name; prop++)
116 if (!strcmp(name, prop->name))
122 static const void *property_get_pointer(const struct property_entry *prop)
127 return prop->is_inline ? &prop->value : prop->pointer;
130 static const void *property_entry_find(const struct property_entry *props,
131 const char *propname, size_t length)
133 const struct property_entry *prop;
136 prop = property_entry_get(props, propname);
138 return ERR_PTR(-EINVAL);
139 pointer = property_get_pointer(prop);
141 return ERR_PTR(-ENODATA);
142 if (length > prop->length)
143 return ERR_PTR(-EOVERFLOW);
148 property_entry_count_elems_of_size(const struct property_entry *props,
149 const char *propname, size_t length)
151 const struct property_entry *prop;
153 prop = property_entry_get(props, propname);
157 return prop->length / length;
160 static int property_entry_read_int_array(const struct property_entry *props,
162 unsigned int elem_size, void *val,
169 return property_entry_count_elems_of_size(props, name,
172 if (!is_power_of_2(elem_size) || elem_size > sizeof(u64))
175 length = nval * elem_size;
177 pointer = property_entry_find(props, name, length);
179 return PTR_ERR(pointer);
181 memcpy(val, pointer, length);
185 static int property_entry_read_string_array(const struct property_entry *props,
186 const char *propname,
187 const char **strings, size_t nval)
193 /* Find out the array length. */
194 array_len = property_entry_count_elems_of_size(props, propname,
195 sizeof(const char *));
199 /* Return how many there are if strings is NULL. */
203 array_len = min_t(size_t, nval, array_len);
204 length = array_len * sizeof(*strings);
206 pointer = property_entry_find(props, propname, length);
208 return PTR_ERR(pointer);
210 memcpy(strings, pointer, length);
215 static void property_entry_free_data(const struct property_entry *p)
217 const char * const *src_str;
220 if (p->type == DEV_PROP_STRING) {
221 src_str = property_get_pointer(p);
222 nval = p->length / sizeof(*src_str);
223 for (i = 0; i < nval; i++)
233 static bool property_copy_string_array(const char **dst_ptr,
234 const char * const *src_ptr,
239 for (i = 0; i < nval; i++) {
240 dst_ptr[i] = kstrdup(src_ptr[i], GFP_KERNEL);
241 if (!dst_ptr[i] && src_ptr[i]) {
251 static int property_entry_copy_data(struct property_entry *dst,
252 const struct property_entry *src)
254 const void *pointer = property_get_pointer(src);
259 * Properties with no data should not be marked as stored
262 if (!src->is_inline && !src->length)
266 * Reference properties are never stored inline as
269 if (src->type == DEV_PROP_REF && src->is_inline)
272 if (src->length <= sizeof(dst->value)) {
273 dst_ptr = &dst->value;
274 dst->is_inline = true;
276 dst_ptr = kmalloc(src->length, GFP_KERNEL);
279 dst->pointer = dst_ptr;
282 if (src->type == DEV_PROP_STRING) {
283 nval = src->length / sizeof(const char *);
284 if (!property_copy_string_array(dst_ptr, pointer, nval)) {
290 memcpy(dst_ptr, pointer, src->length);
293 dst->length = src->length;
294 dst->type = src->type;
295 dst->name = kstrdup(src->name, GFP_KERNEL);
297 property_entry_free_data(dst);
305 * property_entries_dup - duplicate array of properties
306 * @properties: array of properties to copy
308 * This function creates a deep copy of the given NULL-terminated array
309 * of property entries.
311 struct property_entry *
312 property_entries_dup(const struct property_entry *properties)
314 struct property_entry *p;
321 while (properties[n].name)
324 p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
326 return ERR_PTR(-ENOMEM);
328 for (i = 0; i < n; i++) {
329 ret = property_entry_copy_data(&p[i], &properties[i]);
332 property_entry_free_data(&p[i]);
340 EXPORT_SYMBOL_GPL(property_entries_dup);
343 * property_entries_free - free previously allocated array of properties
344 * @properties: array of properties to destroy
346 * This function frees given NULL-terminated array of property entries,
347 * along with their data.
349 void property_entries_free(const struct property_entry *properties)
351 const struct property_entry *p;
356 for (p = properties; p->name; p++)
357 property_entry_free_data(p);
361 EXPORT_SYMBOL_GPL(property_entries_free);
363 /* -------------------------------------------------------------------------- */
364 /* fwnode operations */
366 static struct fwnode_handle *software_node_get(struct fwnode_handle *fwnode)
368 struct swnode *swnode = to_swnode(fwnode);
370 kobject_get(&swnode->kobj);
372 return &swnode->fwnode;
375 static void software_node_put(struct fwnode_handle *fwnode)
377 struct swnode *swnode = to_swnode(fwnode);
379 kobject_put(&swnode->kobj);
382 static bool software_node_property_present(const struct fwnode_handle *fwnode,
383 const char *propname)
385 struct swnode *swnode = to_swnode(fwnode);
387 return !!property_entry_get(swnode->node->properties, propname);
390 static int software_node_read_int_array(const struct fwnode_handle *fwnode,
391 const char *propname,
392 unsigned int elem_size, void *val,
395 struct swnode *swnode = to_swnode(fwnode);
397 return property_entry_read_int_array(swnode->node->properties, propname,
398 elem_size, val, nval);
401 static int software_node_read_string_array(const struct fwnode_handle *fwnode,
402 const char *propname,
403 const char **val, size_t nval)
405 struct swnode *swnode = to_swnode(fwnode);
407 return property_entry_read_string_array(swnode->node->properties,
408 propname, val, nval);
412 software_node_get_name(const struct fwnode_handle *fwnode)
414 const struct swnode *swnode = to_swnode(fwnode);
416 return kobject_name(&swnode->kobj);
420 software_node_get_name_prefix(const struct fwnode_handle *fwnode)
422 struct fwnode_handle *parent;
425 parent = fwnode_get_parent(fwnode);
429 /* Figure out the prefix from the parents. */
430 while (is_software_node(parent))
431 parent = fwnode_get_next_parent(parent);
433 prefix = fwnode_get_name_prefix(parent);
434 fwnode_handle_put(parent);
436 /* Guess something if prefix was NULL. */
437 return prefix ?: "/";
440 static struct fwnode_handle *
441 software_node_get_parent(const struct fwnode_handle *fwnode)
443 struct swnode *swnode = to_swnode(fwnode);
445 if (!swnode || !swnode->parent)
448 return fwnode_handle_get(&swnode->parent->fwnode);
451 static struct fwnode_handle *
452 software_node_get_next_child(const struct fwnode_handle *fwnode,
453 struct fwnode_handle *child)
455 struct swnode *p = to_swnode(fwnode);
456 struct swnode *c = to_swnode(child);
458 if (!p || list_empty(&p->children) ||
459 (c && list_is_last(&c->entry, &p->children))) {
460 fwnode_handle_put(child);
465 c = list_next_entry(c, entry);
467 c = list_first_entry(&p->children, struct swnode, entry);
469 fwnode_handle_put(child);
470 return fwnode_handle_get(&c->fwnode);
473 static struct fwnode_handle *
474 software_node_get_named_child_node(const struct fwnode_handle *fwnode,
475 const char *childname)
477 struct swnode *swnode = to_swnode(fwnode);
478 struct swnode *child;
480 if (!swnode || list_empty(&swnode->children))
483 list_for_each_entry(child, &swnode->children, entry) {
484 if (!strcmp(childname, kobject_name(&child->kobj))) {
485 kobject_get(&child->kobj);
486 return &child->fwnode;
493 software_node_get_reference_args(const struct fwnode_handle *fwnode,
494 const char *propname, const char *nargs_prop,
495 unsigned int nargs, unsigned int index,
496 struct fwnode_reference_args *args)
498 struct swnode *swnode = to_swnode(fwnode);
499 const struct software_node_ref_args *ref_array;
500 const struct software_node_ref_args *ref;
501 const struct property_entry *prop;
502 struct fwnode_handle *refnode;
507 prop = property_entry_get(swnode->node->properties, propname);
511 if (prop->type != DEV_PROP_REF)
515 * We expect that references are never stored inline, even
516 * single ones, as they are too big.
521 if (index * sizeof(*ref) >= prop->length)
524 ref_array = prop->pointer;
525 ref = &ref_array[index];
527 refnode = software_node_fwnode(ref->node);
532 error = property_entry_read_int_array(ref->node->properties,
533 nargs_prop, sizeof(u32),
538 nargs = nargs_prop_val;
541 if (nargs > NR_FWNODE_REFERENCE_ARGS)
547 args->fwnode = software_node_get(refnode);
550 for (i = 0; i < nargs; i++)
551 args->args[i] = ref->args[i];
556 static struct fwnode_handle *
557 swnode_graph_find_next_port(const struct fwnode_handle *parent,
558 struct fwnode_handle *port)
560 struct fwnode_handle *old = port;
562 while ((port = software_node_get_next_child(parent, old))) {
564 * fwnode ports have naming style "port@", so we search for any
565 * children that follow that convention.
567 if (!strncmp(to_swnode(port)->node->name, "port@",
576 static struct fwnode_handle *
577 software_node_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
578 struct fwnode_handle *endpoint)
580 struct swnode *swnode = to_swnode(fwnode);
581 struct fwnode_handle *parent;
582 struct fwnode_handle *port;
588 port = software_node_get_parent(endpoint);
589 parent = software_node_get_parent(port);
591 parent = software_node_get_named_child_node(fwnode, "ports");
593 parent = software_node_get(&swnode->fwnode);
595 port = swnode_graph_find_next_port(parent, NULL);
598 for (; port; port = swnode_graph_find_next_port(parent, port)) {
599 endpoint = software_node_get_next_child(port, endpoint);
601 fwnode_handle_put(port);
606 fwnode_handle_put(parent);
611 static struct fwnode_handle *
612 software_node_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
614 struct swnode *swnode = to_swnode(fwnode);
615 const struct software_node_ref_args *ref;
616 const struct property_entry *prop;
621 prop = property_entry_get(swnode->node->properties, "remote-endpoint");
622 if (!prop || prop->type != DEV_PROP_REF || prop->is_inline)
627 return software_node_get(software_node_fwnode(ref[0].node));
630 static struct fwnode_handle *
631 software_node_graph_get_port_parent(struct fwnode_handle *fwnode)
633 struct swnode *swnode = to_swnode(fwnode);
635 swnode = swnode->parent;
636 if (swnode && !strcmp(swnode->node->name, "ports"))
637 swnode = swnode->parent;
639 return swnode ? software_node_get(&swnode->fwnode) : NULL;
643 software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode,
644 struct fwnode_endpoint *endpoint)
646 struct swnode *swnode = to_swnode(fwnode);
647 const char *parent_name = swnode->parent->node->name;
650 if (strlen("port@") >= strlen(parent_name) ||
651 strncmp(parent_name, "port@", strlen("port@")))
654 /* Ports have naming style "port@n", we need to select the n */
655 ret = kstrtou32(parent_name + strlen("port@"), 10, &endpoint->port);
659 endpoint->id = swnode->id;
660 endpoint->local_fwnode = fwnode;
665 static const struct fwnode_operations software_node_ops = {
666 .get = software_node_get,
667 .put = software_node_put,
668 .property_present = software_node_property_present,
669 .property_read_int_array = software_node_read_int_array,
670 .property_read_string_array = software_node_read_string_array,
671 .get_name = software_node_get_name,
672 .get_name_prefix = software_node_get_name_prefix,
673 .get_parent = software_node_get_parent,
674 .get_next_child_node = software_node_get_next_child,
675 .get_named_child_node = software_node_get_named_child_node,
676 .get_reference_args = software_node_get_reference_args,
677 .graph_get_next_endpoint = software_node_graph_get_next_endpoint,
678 .graph_get_remote_endpoint = software_node_graph_get_remote_endpoint,
679 .graph_get_port_parent = software_node_graph_get_port_parent,
680 .graph_parse_endpoint = software_node_graph_parse_endpoint,
683 /* -------------------------------------------------------------------------- */
686 * software_node_find_by_name - Find software node by name
687 * @parent: Parent of the software node
688 * @name: Name of the software node
690 * The function will find a node that is child of @parent and that is named
691 * @name. If no node is found, the function returns NULL.
693 * NOTE: you will need to drop the reference with fwnode_handle_put() after use.
695 const struct software_node *
696 software_node_find_by_name(const struct software_node *parent, const char *name)
698 struct swnode *swnode = NULL;
704 spin_lock(&swnode_kset->list_lock);
706 list_for_each_entry(k, &swnode_kset->list, entry) {
707 swnode = kobj_to_swnode(k);
708 if (parent == swnode->node->parent && swnode->node->name &&
709 !strcmp(name, swnode->node->name)) {
710 kobject_get(&swnode->kobj);
716 spin_unlock(&swnode_kset->list_lock);
718 return swnode ? swnode->node : NULL;
720 EXPORT_SYMBOL_GPL(software_node_find_by_name);
722 static struct software_node *software_node_alloc(const struct property_entry *properties)
724 struct property_entry *props;
725 struct software_node *node;
727 props = property_entries_dup(properties);
729 return ERR_CAST(props);
731 node = kzalloc(sizeof(*node), GFP_KERNEL);
733 property_entries_free(props);
734 return ERR_PTR(-ENOMEM);
737 node->properties = props;
742 static void software_node_free(const struct software_node *node)
744 property_entries_free(node->properties);
748 static void software_node_release(struct kobject *kobj)
750 struct swnode *swnode = kobj_to_swnode(kobj);
752 if (swnode->parent) {
753 ida_simple_remove(&swnode->parent->child_ids, swnode->id);
754 list_del(&swnode->entry);
756 ida_simple_remove(&swnode_root_ids, swnode->id);
759 if (swnode->allocated)
760 software_node_free(swnode->node);
762 ida_destroy(&swnode->child_ids);
766 static const struct kobj_type software_node_type = {
767 .release = software_node_release,
768 .sysfs_ops = &kobj_sysfs_ops,
771 static struct fwnode_handle *
772 swnode_register(const struct software_node *node, struct swnode *parent,
773 unsigned int allocated)
775 struct swnode *swnode;
778 swnode = kzalloc(sizeof(*swnode), GFP_KERNEL);
780 return ERR_PTR(-ENOMEM);
782 ret = ida_simple_get(parent ? &parent->child_ids : &swnode_root_ids,
791 swnode->parent = parent;
792 swnode->kobj.kset = swnode_kset;
793 fwnode_init(&swnode->fwnode, &software_node_ops);
795 ida_init(&swnode->child_ids);
796 INIT_LIST_HEAD(&swnode->entry);
797 INIT_LIST_HEAD(&swnode->children);
800 ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
801 parent ? &parent->kobj : NULL,
804 ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
805 parent ? &parent->kobj : NULL,
806 "node%d", swnode->id);
808 kobject_put(&swnode->kobj);
813 * Assign the flag only in the successful case, so
814 * the above kobject_put() won't mess up with properties.
816 swnode->allocated = allocated;
819 list_add_tail(&swnode->entry, &parent->children);
821 kobject_uevent(&swnode->kobj, KOBJ_ADD);
822 return &swnode->fwnode;
826 * software_node_register_node_group - Register a group of software nodes
827 * @node_group: NULL terminated array of software node pointers to be registered
829 * Register multiple software nodes at once. If any node in the array
830 * has its .parent pointer set (which can only be to another software_node),
831 * then its parent **must** have been registered before it is; either outside
832 * of this function or by ordering the array such that parent comes before
835 int software_node_register_node_group(const struct software_node **node_group)
843 for (i = 0; node_group[i]; i++) {
844 ret = software_node_register(node_group[i]);
846 software_node_unregister_node_group(node_group);
853 EXPORT_SYMBOL_GPL(software_node_register_node_group);
856 * software_node_unregister_node_group - Unregister a group of software nodes
857 * @node_group: NULL terminated array of software node pointers to be unregistered
859 * Unregister multiple software nodes at once. If parent pointers are set up
860 * in any of the software nodes then the array **must** be ordered such that
861 * parents come before their children.
863 * NOTE: If you are uncertain whether the array is ordered such that
864 * parents will be unregistered before their children, it is wiser to
865 * remove the nodes individually, in the correct order (child before
868 void software_node_unregister_node_group(
869 const struct software_node **node_group)
876 while (node_group[i])
880 software_node_unregister(node_group[i]);
882 EXPORT_SYMBOL_GPL(software_node_unregister_node_group);
885 * software_node_register - Register static software node
886 * @node: The software node to be registered
888 int software_node_register(const struct software_node *node)
890 struct swnode *parent = software_node_to_swnode(node->parent);
892 if (software_node_to_swnode(node))
895 if (node->parent && !parent)
898 return PTR_ERR_OR_ZERO(swnode_register(node, parent, 0));
900 EXPORT_SYMBOL_GPL(software_node_register);
903 * software_node_unregister - Unregister static software node
904 * @node: The software node to be unregistered
906 void software_node_unregister(const struct software_node *node)
908 struct swnode *swnode;
910 swnode = software_node_to_swnode(node);
912 fwnode_remove_software_node(&swnode->fwnode);
914 EXPORT_SYMBOL_GPL(software_node_unregister);
916 struct fwnode_handle *
917 fwnode_create_software_node(const struct property_entry *properties,
918 const struct fwnode_handle *parent)
920 struct fwnode_handle *fwnode;
921 struct software_node *node;
925 return ERR_CAST(parent);
927 p = to_swnode(parent);
929 return ERR_PTR(-EINVAL);
931 node = software_node_alloc(properties);
933 return ERR_CAST(node);
935 node->parent = p ? p->node : NULL;
937 fwnode = swnode_register(node, p, 1);
939 software_node_free(node);
943 EXPORT_SYMBOL_GPL(fwnode_create_software_node);
945 void fwnode_remove_software_node(struct fwnode_handle *fwnode)
947 struct swnode *swnode = to_swnode(fwnode);
952 kobject_put(&swnode->kobj);
954 EXPORT_SYMBOL_GPL(fwnode_remove_software_node);
957 * device_add_software_node - Assign software node to a device
958 * @dev: The device the software node is meant for.
959 * @node: The software node.
961 * This function will make @node the secondary firmware node pointer of @dev. If
962 * @dev has no primary node, then @node will become the primary node. The
963 * function will register @node automatically if it wasn't already registered.
965 int device_add_software_node(struct device *dev, const struct software_node *node)
967 struct swnode *swnode;
970 /* Only one software node per device. */
971 if (dev_to_swnode(dev))
974 swnode = software_node_to_swnode(node);
976 kobject_get(&swnode->kobj);
978 ret = software_node_register(node);
982 swnode = software_node_to_swnode(node);
985 set_secondary_fwnode(dev, &swnode->fwnode);
988 * If the device has been fully registered by the time this function is
989 * called, software_node_notify() must be called separately so that the
990 * symlinks get created and the reference count of the node is kept in
993 if (device_is_registered(dev))
994 software_node_notify(dev);
998 EXPORT_SYMBOL_GPL(device_add_software_node);
1001 * device_remove_software_node - Remove device's software node
1002 * @dev: The device with the software node.
1004 * This function will unregister the software node of @dev.
1006 void device_remove_software_node(struct device *dev)
1008 struct swnode *swnode;
1010 swnode = dev_to_swnode(dev);
1014 if (device_is_registered(dev))
1015 software_node_notify_remove(dev);
1017 set_secondary_fwnode(dev, NULL);
1018 kobject_put(&swnode->kobj);
1020 EXPORT_SYMBOL_GPL(device_remove_software_node);
1023 * device_create_managed_software_node - Create a software node for a device
1024 * @dev: The device the software node is assigned to.
1025 * @properties: Device properties for the software node.
1026 * @parent: Parent of the software node.
1028 * Creates a software node as a managed resource for @dev, which means the
1029 * lifetime of the newly created software node is tied to the lifetime of @dev.
1030 * Software nodes created with this function should not be reused or shared
1031 * because of that. The function takes a deep copy of @properties for the
1034 * Since the new software node is assigned directly to @dev, and since it should
1035 * not be shared, it is not returned to the caller. The function returns 0 on
1036 * success, and errno in case of an error.
1038 int device_create_managed_software_node(struct device *dev,
1039 const struct property_entry *properties,
1040 const struct software_node *parent)
1042 struct fwnode_handle *p = software_node_fwnode(parent);
1043 struct fwnode_handle *fwnode;
1048 fwnode = fwnode_create_software_node(properties, p);
1050 return PTR_ERR(fwnode);
1052 to_swnode(fwnode)->managed = true;
1053 set_secondary_fwnode(dev, fwnode);
1055 if (device_is_registered(dev))
1056 software_node_notify(dev);
1060 EXPORT_SYMBOL_GPL(device_create_managed_software_node);
1062 void software_node_notify(struct device *dev)
1064 struct swnode *swnode;
1067 swnode = dev_to_swnode(dev);
1071 ret = sysfs_create_link(&dev->kobj, &swnode->kobj, "software_node");
1075 ret = sysfs_create_link(&swnode->kobj, &dev->kobj, dev_name(dev));
1077 sysfs_remove_link(&dev->kobj, "software_node");
1081 kobject_get(&swnode->kobj);
1084 void software_node_notify_remove(struct device *dev)
1086 struct swnode *swnode;
1088 swnode = dev_to_swnode(dev);
1092 sysfs_remove_link(&swnode->kobj, dev_name(dev));
1093 sysfs_remove_link(&dev->kobj, "software_node");
1094 kobject_put(&swnode->kobj);
1096 if (swnode->managed) {
1097 set_secondary_fwnode(dev, NULL);
1098 kobject_put(&swnode->kobj);
1102 static int __init software_node_init(void)
1104 swnode_kset = kset_create_and_add("software_nodes", NULL, kernel_kobj);
1109 postcore_initcall(software_node_init);
1111 static void __exit software_node_exit(void)
1113 ida_destroy(&swnode_root_ids);
1114 kset_unregister(swnode_kset);
1116 __exitcall(software_node_exit);