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-rw-r--r--fs/signalfd.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 79c1eea98a3..7ae2a574cb2 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;