diff options
| -rw-r--r-- | lib/kref.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/kref.c b/lib/kref.c index 0d07cc31c818..4a467faf1367 100644 --- a/lib/kref.c +++ b/lib/kref.c @@ -52,7 +52,12 @@ int kref_put(struct kref *kref, void (*release)(struct kref *kref)) WARN_ON(release == NULL); WARN_ON(release == (void (*)(struct kref *))kfree); - if (atomic_dec_and_test(&kref->refcount)) { + /* + * if current count is one, we are the last user and can release object + * right now, avoiding an atomic operation on 'refcount' + */ + if ((atomic_read(&kref->refcount) == 1) || + (atomic_dec_and_test(&kref->refcount))) { release(kref); return 1; } |