2 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index c8e375440403..bf8f3c003297 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -522,6 +522,7 @@ struct pmu {
  * enum perf_event_active_state - the states of a event
  */
 enum perf_event_active_state {
+        PERF_EVENT_STATE_FREE           = -3,
         PERF_EVENT_STATE_ERROR          = -2,
         PERF_EVENT_STATE_OFF            = -1,
         PERF_EVENT_STATE_INACTIVE       =  0,
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 3d1552d3c12b..f13c3db765f4 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -341,6 +341,9 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
         if (event->state > PERF_EVENT_STATE_OFF)
                 event->state = PERF_EVENT_STATE_OFF;
 
+        if (event->state > PERF_EVENT_STATE_FREE)
+                return;
+
         /*
          * If this was a group event with sibling events then
          * upgrade the siblings to singleton events by adding them
@@ -1856,6 +1859,8 @@ int perf_event_release_kernel(struct perf_event *event)
 {
         struct perf_event_context *ctx = event->ctx;
 
+        event->state = PERF_EVENT_STATE_FREE;
+
         WARN_ON_ONCE(ctx->parent_ctx);
         mutex_lock(&ctx->mutex);
         perf_event_remove_from_context(event);