perf: Fix tear-down of inherited group events

[pandora-kernel.git] / kernel / perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 533f715..3472bb1 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -6722,17 +6722,20 @@ __perf_event_exit_task(struct perf_event *child_event,
                         struct perf_event_context *child_ctx,
                         struct task_struct *child)
 {
-       struct perf_event *parent_event;
+       if (child_event->parent) {
+               raw_spin_lock_irq(&child_ctx->lock);
+               perf_group_detach(child_event);
+               raw_spin_unlock_irq(&child_ctx->lock);
+       }
 
        perf_remove_from_context(child_event);
 
-       parent_event = child_event->parent;
        /*
-        * It can happen that parent exits first, and has events
+        * It can happen that the parent exits first, and has events
         * that are still around due to the child reference. These
-        * events need to be zapped - but otherwise linger.
+        * events need to be zapped.
         */
-       if (parent_event) {
+       if (child_event->parent) {
                sync_child_event(child_event, child);
                free_event(child_event);
        }