[29/44] perf: Handle stopped state with tracepoints

[Greg KH]

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Frederic Weisbecker <fweisbec@xxxxxxxxx>

commit a0f7d0f7fc02465bb9758501f611f63381792996 upstream.

We toggle the state from start and stop callbacks but actually
don't check it when the event triggers. Do it so that
these callbacks actually work.

Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
LKML-Reference: <1299529629-18280-2-git-send-email-fweisbec@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 kernel/perf_event.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4167,6 +4167,8 @@ static void tp_perf_event_destroy(struct
 
 static const struct pmu *tp_perf_event_init(struct perf_event *event)
 {
+	if (event->hw.state & PERF_HES_STOPPED)
+		return 0;
 	/*
 	 * Raw tracepoint data is a severe data leak, only allow root to
 	 * have these.


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