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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-05-21 16:22:33 +0200
committerIngo Molnar <mingo@elte.hu>2010-05-31 08:46:09 +0200
commit2e97942fe57864588774f173cf4cd7bb68968b76 (patch)
treebf0eeda8c13a6e851ad755b7114ceaa82c51fd97 /kernel
parent3771f0771154675d4a0ca780be2411f3cc357208 (diff)
downloadop-kernel-dev-2e97942fe57864588774f173cf4cd7bb68968b76.zip
op-kernel-dev-2e97942fe57864588774f173cf4cd7bb68968b76.tar.gz
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_event_perf.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 49c7abf..e6f6588 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -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,
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