diff options
Diffstat (limited to 'fs/signalfd.c')
| -rw-r--r-- | fs/signalfd.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/signalfd.c b/fs/signalfd.c index 79c1eea..7ae2a57 100644 --- a/fs/signalfd.c +++ b/fs/signalfd.c @@ -33,7 +33,11 @@ void signalfd_cleanup(struct sighand_struct *sighand) { wait_queue_head_t *wqh = &sighand->signalfd_wqh; - + /* + * The lockless check can race with remove_wait_queue() in progress, + * but in this case its caller should run under rcu_read_lock() and + * sighand_cachep is SLAB_DESTROY_BY_RCU, we can safely return. + */ if (likely(!waitqueue_active(wqh))) return; |