1 files changed, 10 insertions, 2 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 10d076b2572c..072b8a686517 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4740,12 +4740,20 @@ static const struct file_operations perf_fops = {
  * to user-space before waking everybody up.
  */
 
+static inline struct fasync_struct **perf_event_fasync(struct perf_event *event)
+{
+        /* only the parent has fasync state */
+        if (event->parent)
+                event = event->parent;
+        return &event->fasync;
+}
+
 void perf_event_wakeup(struct perf_event *event)
 {
         ring_buffer_wakeup(event);
 
         if (event->pending_kill) {
-                kill_fasync(&event->fasync, SIGIO, event->pending_kill);
+                kill_fasync(perf_event_fasync(event), SIGIO, event->pending_kill);
                 event->pending_kill = 0;
         }
 }
@@ -6124,7 +6132,7 @@ static int __perf_event_overflow(struct perf_event *event,
         else
                 perf_event_output(event, data, regs);
 
-        if (event->fasync && event->pending_kill) {
+        if (*perf_event_fasync(event) && event->pending_kill) {
                 event->pending_wakeup = 1;
                 irq_work_queue(&event->pending);
         }