From: Frederic Weisbecker <fweisbec@gmail.com>
Date: Mon, 7 Mar 2011 20:27:09 +0000 (+0100)
Subject: perf: Handle stopped state with tracepoints
X-Git-Tag: v2.6.38.1~18
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0a5bdee8013fd9ac665185f47fc0b00e000c7d85;p=karo-tx-linux.git

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>
---

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 853705f6d294..b22a2ef75c86 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4923,6 +4923,8 @@ 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.
 	 */