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-rw-r--r--include/linux/kobject.h4
-rw-r--r--lib/kobject.c92
2 files changed, 94 insertions, 2 deletions
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 0b97b3a..f91aeb7 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -150,11 +150,13 @@ struct kset {
struct kset_uevent_ops *uevent_ops;
};
-
extern void kset_init(struct kset * k);
extern int __must_check kset_add(struct kset * k);
extern int __must_check kset_register(struct kset * k);
extern void kset_unregister(struct kset * k);
+extern struct kset * __must_check kset_create_and_add(const char *name,
+ struct kset_uevent_ops *u,
+ struct kobject *parent_kobj);
static inline struct kset * to_kset(struct kobject * kobj)
{
diff --git a/lib/kobject.c b/lib/kobject.c
index 8f24940..4fb27ba 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -186,8 +186,15 @@ int kobject_add(struct kobject * kobj)
if (kobj->kset) {
spin_lock(&kobj->kset->list_lock);
- if (!parent)
+ if (!parent) {
parent = kobject_get(&kobj->kset->kobj);
+ /*
+ * If the kset is our parent, get a second
+ * reference, we drop both the kset and the
+ * parent ref on cleanup
+ */
+ kobject_get(parent);
+ }
list_add_tail(&kobj->entry,&kobj->kset->list);
spin_unlock(&kobj->kset->list_lock);
@@ -787,6 +794,89 @@ int subsys_create_file(struct kset *s, struct subsys_attribute *a)
return error;
}
+static void kset_release(struct kobject *kobj)
+{
+ struct kset *kset = container_of(kobj, struct kset, kobj);
+ pr_debug("kset %s: now freed\n", kobject_name(kobj));
+ kfree(kset);
+}
+
+static struct kobj_type kset_type = {
+ .release = kset_release,
+};
+
+/**
+ * kset_create - create a struct kset dynamically
+ *
+ * @name: the name for the kset
+ * @uevent_ops: a struct kset_uevent_ops for the kset
+ * @parent_kobj: the parent kobject of this kset, if any.
+ *
+ * This function creates a kset structure dynamically. This structure can
+ * then be registered with the system and show up in sysfs with a call to
+ * kset_register(). When you are finished with this structure, if
+ * kset_register() has been called, call kset_unregister() and the
+ * structure will be dynamically freed when it is no longer being used.
+ *
+ * If the kset was not able to be created, NULL will be returned.
+ */
+static struct kset *kset_create(const char *name,
+ struct kset_uevent_ops *uevent_ops,
+ struct kobject *parent_kobj)
+{
+ struct kset *kset;
+
+ kset = kzalloc(sizeof(*kset), GFP_KERNEL);
+ if (!kset)
+ return NULL;
+ kobject_set_name(&kset->kobj, name);
+ kset->uevent_ops = uevent_ops;
+ kset->kobj.parent = parent_kobj;
+
+ /*
+ * The kobject of this kset will have a type of kset_type and belong to
+ * no kset itself. That way we can properly free it when it is
+ * finished being used.
+ */
+ kset->kobj.ktype = &kset_type;
+ kset->kobj.kset = NULL;
+
+ return kset;
+}
+
+/**
+ * kset_create_and_add - create a struct kset dynamically and add it to sysfs
+ *
+ * @name: the name for the kset
+ * @uevent_ops: a struct kset_uevent_ops for the kset
+ * @parent_kobj: the parent kobject of this kset, if any.
+ *
+ * This function creates a kset structure dynamically and registers it
+ * with sysfs. When you are finished with this structure, call
+ * kset_unregister() and the structure will be dynamically freed when it
+ * is no longer being used.
+ *
+ * If the kset was not able to be created, NULL will be returned.
+ */
+struct kset *kset_create_and_add(const char *name,
+ struct kset_uevent_ops *uevent_ops,
+ struct kobject *parent_kobj)
+{
+ struct kset *kset;
+ int error;
+
+ kset = kset_create(name, uevent_ops, parent_kobj);
+ if (!kset)
+ return NULL;
+ error = kset_register(kset);
+ if (error) {
+ kfree(kset);
+ return NULL;
+ }
+ return kset;
+}
+EXPORT_SYMBOL_GPL(kset_create_and_add);
+
EXPORT_SYMBOL(kobject_init);
EXPORT_SYMBOL(kobject_register);
EXPORT_SYMBOL(kobject_unregister);
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