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SubjectRe: ftrace/perf_event leak
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On Wed, 2010-09-01 at 17:38 +0800, Li Zefan wrote:

> ---
> diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
> index 8a2b73f..9d1d1f2 100644
> --- a/kernel/trace/trace_event_perf.c
> +++ b/kernel/trace/trace_event_perf.c
> @@ -161,6 +161,7 @@ void perf_trace_destroy(struct perf_event *p_event)
> }
> }
> out:
> + module_put(tp_event->mod);
> mutex_unlock(&event_mutex);
> }

Ah, indeed, we so that try_module_get() for each reference to the
tracepoint, I guess we also should do the below, in case the
registration fails.

diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 000e6e8..31cc4cb 100644
--- 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;
}
}

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