diff options
| -rw-r--r-- | include/linux/kref.h | 1 | ||||
| -rw-r--r-- | lib/kref.c | 12 |
2 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/kref.h b/include/linux/kref.h index 6cc38fc07ab7..90b9e44abf54 100644 --- a/include/linux/kref.h +++ b/include/linux/kref.h @@ -23,6 +23,7 @@ struct kref { void kref_init(struct kref *kref); void kref_get(struct kref *kref); +int kref_test_and_get(struct kref *kref); int kref_put(struct kref *kref, void (*release) (struct kref *kref)); #endif /* _KREF_H_ */ diff --git a/lib/kref.c b/lib/kref.c index d3d227a08a4b..e7a6e1067122 100644 --- a/lib/kref.c +++ b/lib/kref.c @@ -37,6 +37,18 @@ void kref_get(struct kref *kref) } /** + * kref_test_and_get - increment refcount for object only if refcount is not + * zero. + * @kref: object. + * + * Return non-zero if the refcount was incremented, 0 otherwise + */ +int kref_test_and_get(struct kref *kref) +{ + return atomic_inc_not_zero(&kref->refcount); +} + +/** * kref_put - decrement refcount for object. * @kref: object. * @release: pointer to the function that will clean up the object when the |