perf, trace: Fix module leak

Commit 1c024eca (perf, trace: Optimize tracepoints by using
per-tracepoint-per-cpu hlist to track events) caused a module
refcount leak.

Reported-And-Tested-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4C7E1F12.8030304@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 000e6e8..31cc4cb 100644 (file)
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -91,6 +91,8 @@ int perf_trace_init(struct perf_event *p_event)
                    tp_event->class && tp_event->class->reg &&
                    try_module_get(tp_event->mod)) {
                        ret = perf_trace_event_init(tp_event, p_event);
+                       if (ret)
+                               module_put(tp_event->mod);
                        break;
                }
        }
@@ -146,6 +148,7 @@ void perf_trace_destroy(struct perf_event *p_event)
                }
        }
 out:
+       module_put(tp_event->mod);
        mutex_unlock(&event_mutex);
 }