diff options
| -rw-r--r-- | lib/rwsem.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/rwsem.c b/lib/rwsem.c index cf0ad2ad19f5..19c5fa95e0b4 100644 --- a/lib/rwsem.c +++ b/lib/rwsem.c @@ -223,7 +223,9 @@ struct rw_semaphore __sched *rwsem_down_write_failed(struct rw_semaphore *sem) count = RWSEM_ACTIVE_WRITE_BIAS; if (!list_is_singular(&sem->wait_list)) count += RWSEM_WAITING_BIAS; - if (cmpxchg(&sem->count, RWSEM_WAITING_BIAS, count) == + + if (sem->count == RWSEM_WAITING_BIAS && + cmpxchg(&sem->count, RWSEM_WAITING_BIAS, count) == RWSEM_WAITING_BIAS) break; } |