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perf: Fix free_event()

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With the context rework stuff we can actually end up freeing an event
before it gets attached to a context.

Reported-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-09-13 11:15:58 +02:00 committed by Ingo Molnar
parent cde8e88498
commit 0c67b40872
1 changed files with 3 additions and 1 deletions
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4
kernel/perf_event.c
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@ -2150,7 +2150,9 @@ static void free_event(struct perf_event *event)
if (event->destroy)
event->destroy(event);
put_ctx(event->ctx);
if (event->ctx)
put_ctx(event->ctx);
call_rcu(&event->rcu_head, free_event_rcu);
}