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perf_events, trace: Fix perf_trace_destroy(), mutex went missing 

Steve spotted I forgot to do the destroy under event_mutex.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1274451913.1674.1707.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Peter Zijlstra 2010-05-21 16:22:33 +02:00 committed by Ingo Molnar
parent 3771f07711
commit 2e97942fe5
1 changed files with 4 additions and 1 deletions
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5
kernel/trace/trace_event_perf.c
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@ -132,8 +132,9 @@ void perf_trace_destroy(struct perf_event *p_event)
struct ftrace_event_call *tp_event = p_event->tp_event;
int i;
mutex_lock(&event_mutex);
if (--tp_event->perf_refcount > 0)
return;
goto out;
if (tp_event->class->reg)
tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
@ -157,6 +158,8 @@ void perf_trace_destroy(struct perf_event *p_event)
perf_trace_buf[i] = NULL;
}
}
out:
mutex_unlock(&event_mutex);
}
__kprobes void *perf_trace_buf_prepare(int size, unsigned short type,