From 89fc7b8e5c2a313b248a0e4a5614774630e3c745 Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Mon, 7 Mar 2011 21:27:09 +0100
Subject: [PATCH] perf: Handle stopped state with tracepoints

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@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1299529629-18280-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 kernel/perf_event.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index bbdc9c572129..ee489d0847fe 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4770,6 +4770,8 @@ static int perf_tp_event_match(struct perf_event *event,
 				struct perf_sample_data *data,
 				struct pt_regs *regs)
 {
+	if (event->hw.state & PERF_HES_STOPPED)
+		return 0;
 	/*
 	 * All tracepoints are from kernel-space.
 	 */
-- 
2.47.3