This is what the kobject_init function is going to become. Add it to
the kernel and then we can convert over the current kobject_init() users
before renaming it.
Also add a kobject_init_and_add function which bundles up what a lot of
the current callers want to do all at once, and it properly handles the
memory usages, unlike kobject_register();
Cc: Kay Sievers <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
include/linux/kobject.h | 8 ++++
lib/kobject.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 99 insertions(+)
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -79,6 +79,14 @@ static inline const char * kobject_name(
}
extern void kobject_init(struct kobject *);
+extern int __must_check kobject_init_ng(struct kobject *kobj,
+ struct kobj_type *ktype,
+ struct kobject *parent,
+ const char *fmt, ...);
+extern int __must_check kobject_init_and_add(struct kobject *kobj,
+ struct kobj_type *ktype,
+ struct kobject *parent,
+ const char *fmt, ...);
extern void kobject_cleanup(struct kobject *);
extern int __must_check kobject_add(struct kobject *);
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -347,6 +347,97 @@ int kobject_set_name(struct kobject *kob
}
EXPORT_SYMBOL(kobject_set_name);
+/*
+ * kobject_init_varg - the main kobject init function
+ *
+ * The kobject is initialized here with the needed fields. After this
+ * function returns successfully, the kobject can not be freed directly,
+ * kobject_put must be called in order to clean it up properly. If this
+ * function returns an error, the memory can be safely freed directly.
+ */
+static int kobject_init_varg(struct kobject *kobj, struct kobj_type *ktype,
+ struct kobject *parent, const char *fmt,
+ va_list vargs)
+{
+ va_list aq;
+ int retval;
+
+ if ((!kobj) || (!ktype))
+ return -EINVAL;
+
+ WARN_ON(atomic_read(&kobj->kref.refcount));
+ kref_init(&kobj->kref);
+ INIT_LIST_HEAD(&kobj->entry);
+ kobj->ktype = ktype;
+ kobj->parent = parent;
+
+ va_copy(aq, vargs);
+ retval = kobject_set_name_vargs(kobj, fmt, aq);
+ va_end(aq);
+
+ return retval;
+}
+
+/**
+ * kobject_init_ng - initialize a kobject structure
+ * @kobj: pointer to the kobject to initialize
+ * @ktype: pointer to the ktype for this kobject.
+ * @parent: pointer to the parent of this kobject.
+ * @fmt: the name of the kobject.
+ *
+ * This function will properly initialize a kobject such that it can then
+ * be passed to the kobject_add() call.
+ *
+ * If the function returns an error, the memory allocated by the kobject
+ * can be safely freed, no other functions need to be called.
+ */
+int kobject_init_ng(struct kobject *kobj, struct kobj_type *ktype,
+ struct kobject *parent, const char *fmt, ...)
+{
+ va_list args;
+ int retval;
+
+ va_start(args, fmt);
+ retval = kobject_init_varg(kobj, ktype, parent, fmt, args);
+ va_end(args);
+
+ return retval;
+}
+EXPORT_SYMBOL(kobject_init_ng);
+
+/**
+ * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
+ * @kobj: pointer to the kobject to initialize
+ * @ktype: pointer to the ktype for this kobject.
+ * @parent: pointer to the parent of this kobject.
+ * @fmt: the name of the kobject.
+ *
+ * This function will properly initialize a kobject and then call
+ * kobject_add().
+ *
+ * If the function returns an error, the memory allocated by the kobject
+ * can be safely freed, no other functions need to be called.
+ */
+int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
+ struct kobject *parent, const char *fmt, ...)
+{
+ va_list args;
+ int retval;
+
+ va_start(args, fmt);
+ retval = kobject_init_varg(kobj, ktype, parent, fmt, args);
+ va_end(args);
+ if (retval)
+ return retval;
+
+ retval = kobject_add(kobj);
+ if (retval)
+ kobject_put(kobj);
+
+ return retval;
+}
+EXPORT_SYMBOL(kobject_init_and_add);
+
/**
* kobject_rename - change the name of an object
* @kobj: object in question.
-
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