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-rw-r--r--lib/kobject.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/kobject.c b/lib/kobject.c
index 7ce6dc138e9..9aed594bfca 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -126,6 +126,8 @@ EXPORT_SYMBOL_GPL(kobject_get_path);
*/
void kobject_init(struct kobject * kobj)
{
+ if (!kobj)
+ return;
kref_init(&kobj->kref);
INIT_LIST_HEAD(&kobj->entry);
init_waitqueue_head(&kobj->poll);
@@ -366,6 +368,8 @@ out:
void kobject_del(struct kobject * kobj)
{
+ if (!kobj)
+ return;
sysfs_remove_dir(kobj);
unlink(kobj);
}
@@ -377,6 +381,8 @@ void kobject_del(struct kobject * kobj)
void kobject_unregister(struct kobject * kobj)
{
+ if (!kobj)
+ return;
pr_debug("kobject %s: unregistering\n",kobject_name(kobj));
kobject_uevent(kobj, KOBJ_REMOVE);
kobject_del(kobj);
@@ -523,6 +529,8 @@ int kset_add(struct kset * k)
int kset_register(struct kset * k)
{
+ if (!k)
+ return -EINVAL;
kset_init(k);
return kset_add(k);
}
@@ -535,6 +543,8 @@ int kset_register(struct kset * k)
void kset_unregister(struct kset * k)
{
+ if (!k)
+ return;
kobject_unregister(&k->kobj);
}
@@ -586,6 +596,9 @@ int subsystem_register(struct subsystem * s)
{
int error;
+ if (!s)
+ return -EINVAL;
+
subsystem_init(s);
pr_debug("subsystem %s: registering\n",s->kset.kobj.name);
@@ -598,6 +611,8 @@ int subsystem_register(struct subsystem * s)
void subsystem_unregister(struct subsystem * s)
{
+ if (!s)
+ return;
pr_debug("subsystem %s: unregistering\n",s->kset.kobj.name);
kset_unregister(&s->kset);
}
@@ -612,6 +627,10 @@ void subsystem_unregister(struct subsystem * s)
int subsys_create_file(struct subsystem * s, struct subsys_attribute * a)
{
int error = 0;
+
+ if (!s || !a)
+ return -EINVAL;
+
if (subsys_get(s)) {
error = sysfs_create_file(&s->kset.kobj,&a->attr);
subsys_put(s);