}
EXPORT_SYMBOL_GPL(kobject_get_path);
-static void kobject_init_internal(struct kobject * kobj)
+/* add the kobject to its kset's list */
+static void kobj_kset_join(struct kobject *kobj)
{
- if (!kobj)
+ if (!kobj->kset)
return;
- kref_init(&kobj->kref);
- INIT_LIST_HEAD(&kobj->entry);
+
+ kset_get(kobj->kset);
+ spin_lock(&kobj->kset->list_lock);
+ list_add_tail(&kobj->entry, &kobj->kset->list);
+ spin_unlock(&kobj->kset->list_lock);
}
+/* remove the kobject from its kset's list */
+static void kobj_kset_leave(struct kobject *kobj)
+{
+ if (!kobj->kset)
+ return;
-/**
- * unlink - remove kobject from kset list.
- * @kobj: kobject.
- *
- * Remove the kobject from the kset list and decrement
- * its parent's refcount.
- * This is separated out, so we can use it in both
- * kobject_del() and kobject_add_internal() on error.
- */
+ spin_lock(&kobj->kset->list_lock);
+ list_del_init(&kobj->entry);
+ spin_unlock(&kobj->kset->list_lock);
+ kset_put(kobj->kset);
+}
-static void unlink(struct kobject * kobj)
+static void kobject_init_internal(struct kobject * kobj)
{
- struct kobject *parent = kobj->parent;
-
- if (kobj->kset) {
- spin_lock(&kobj->kset->list_lock);
- list_del_init(&kobj->entry);
- spin_unlock(&kobj->kset->list_lock);
- }
- kobj->parent = NULL;
- kobject_put(kobj);
- kobject_put(parent);
+ if (!kobj)
+ return;
+ kref_init(&kobj->kref);
+ INIT_LIST_HEAD(&kobj->entry);
}
+
static int kobject_add_internal(struct kobject *kobj)
{
int error = 0;
struct kobject * parent;
- if (!(kobj = kobject_get(kobj)))
+ if (!kobj)
return -ENOENT;
- if (!kobj->k_name)
- kobject_set_name(kobj, "NO_NAME");
- if (!*kobj->k_name) {
- pr_debug("kobject (%p) attempted to be registered with no "
+
+ if (!kobj->k_name || !kobj->k_name[0]) {
+ pr_debug("kobject: (%p): attempted to be registered with empty "
"name!\n", kobj);
WARN_ON(1);
- kobject_put(kobj);
return -EINVAL;
}
- parent = kobject_get(kobj->parent);
- pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
- kobject_name(kobj), kobj, __FUNCTION__,
- parent ? kobject_name(parent) : "<NULL>",
- kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" );
+ parent = kobject_get(kobj->parent);
+ /* join kset if set, use it as parent if we do not already have one */
if (kobj->kset) {
- kobj->kset = kset_get(kobj->kset);
-
- 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);
- }
-
- spin_lock(&kobj->kset->list_lock);
- list_add_tail(&kobj->entry, &kobj->kset->list);
- spin_unlock(&kobj->kset->list_lock);
+ kobj_kset_join(kobj);
kobj->parent = parent;
}
+ pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
+ kobject_name(kobj), kobj, __FUNCTION__,
+ parent ? kobject_name(parent) : "<NULL>",
+ kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" );
+
error = create_dir(kobj);
if (error) {
- /* unlink does the kobject_put() for us */
- unlink(kobj);
+ kobj_kset_leave(kobj);
+ kobject_put(parent);
+ kobj->parent = NULL;
/* be noisy on error issues */
if (error == -EEXIST)
printk(KERN_ERR "%s failed for %s (%d)\n",
__FUNCTION__, kobject_name(kobj), error);
dump_stack();
- }
+ } else
+ kobj->state_in_sysfs = 1;
return error;
}
if (!name)
return -ENOMEM;
+
/* Free the old name, if necessary. */
kfree(kobj->k_name);
/* Now, set the new name */
kobj->k_name = name;
+ kobj->state_name_set = 1;
return 0;
}
err_str = "must have a ktype to be initialized properly!\n";
goto error;
}
- if (atomic_read(&kobj->kref.refcount)) {
+ if (kobj->state_initialized) {
/* do not error out as sometimes we can recover */
- printk(KERN_ERR "kobject: reference count is already set, "
- "something is seriously wrong.\n");
+ printk(KERN_ERR "kobject (%p): tried to init an initialized "
+ "object, something is seriously wrong.\n", kobj);
dump_stack();
}
kref_init(&kobj->kref);
INIT_LIST_HEAD(&kobj->entry);
kobj->ktype = ktype;
+ kobj->state_name_set = 0;
+ kobj->state_in_sysfs = 0;
+ kobj->state_add_uevent_sent = 0;
+ kobj->state_remove_uevent_sent = 0;
+ kobj->state_initialized = 1;
return;
error:
- printk(KERN_ERR "kobject: %s\n", err_str);
+ printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
dump_stack();
}
EXPORT_SYMBOL(kobject_init);
*
* If this function returns an error, kobject_put() must be called to
* properly clean up the memory associated with the object.
- *
- * If the function is successful, the only way to properly clean up the
- * memory is with a call to kobject_del(), in which case, a call to
- * kobject_put() is not necessary (kobject_del() does the final
- * kobject_put() to call the release function in the ktype's release
- * pointer.)
- *
* Under no instance should the kobject that is passed to this function
* be directly freed with a call to kfree(), that can leak memory.
*
- * Note, no uevent will be created with this call, the caller should set
+ * Note, no "add" uevent will be created with this call, the caller should set
* up all of the necessary sysfs files for the object and then call
* kobject_uevent() with the UEVENT_ADD parameter to ensure that
* userspace is properly notified of this kobject's creation.
if (!kobj)
return -EINVAL;
+ if (!kobj->state_initialized) {
+ printk(KERN_ERR "kobject '%s' (%p): tried to add an "
+ "uninitialized object, something is seriously wrong.\n",
+ kobject_name(kobj), kobj);
+ dump_stack();
+ return -EINVAL;
+ }
va_start(args, fmt);
retval = kobject_add_varg(kobj, parent, fmt, args);
va_end(args);
{
if (!kobj)
return;
+
sysfs_remove_dir(kobj);
- unlink(kobj);
+ kobj->state_in_sysfs = 0;
+ kobj_kset_leave(kobj);
+ kobject_put(kobj->parent);
+ kobj->parent = NULL;
}
/**
*/
static void kobject_cleanup(struct kobject *kobj)
{
- struct kobj_type * t = get_ktype(kobj);
- struct kset * s = kobj->kset;
+ struct kobj_type *t = get_ktype(kobj);
const char *name = kobj->k_name;
+ int name_set = kobj->state_name_set;
pr_debug("kobject: '%s' (%p): %s\n",
kobject_name(kobj), kobj, __FUNCTION__);
+
+ if (t && !t->release)
+ pr_debug("kobject: '%s' (%p): does not have a release() "
+ "function, it is broken and must be fixed.\n",
+ kobject_name(kobj), kobj);
+
+ /* send "remove" if the caller did not do it but sent "add" */
+ if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
+ pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
+ kobject_name(kobj), kobj);
+ kobject_uevent(kobj, KOBJ_REMOVE);
+ }
+
+ /* remove from sysfs if the caller did not do it */
+ if (kobj->state_in_sysfs) {
+ pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
+ kobject_name(kobj), kobj);
+ kobject_del(kobj);
+ }
+
if (t && t->release) {
+ pr_debug("kobject: '%s' (%p): calling ktype release\n",
+ kobject_name(kobj), kobj);
t->release(kobj);
- /* If we have a release function, we can guess that this was
- * not a statically allocated kobject, so we should be safe to
- * free the name */
+ }
+
+ /* free name if we allocated it */
+ if (name_set && name) {
+ pr_debug("kobject: '%s': free name\n", name);
kfree(name);
}
- if (s)
- kset_put(s);
}
static void kobject_release(struct kref *kref)
static void dynamic_kobj_release(struct kobject *kobj)
{
- pr_debug("kobject: '%s' (%p): %s\n",
- kobject_name(kobj), kobj, __FUNCTION__);
+ pr_debug("kobject: (%p): %s\n", kobj, __FUNCTION__);
kfree(kobj);
}
projects / linux-2.6 / commitdiff