linux-kernel - [tip:perf/core] tools lib traceevent: Unregister handler when function plugin is unloaded

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Date:	Sun, 19 Jan 2014 04:22:52 -0800
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, hpa@...or.com,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, namhyung.kim@....com,
	namhyung@...nel.org, jolsa@...hat.com, fweisbec@...il.com,
	rostedt@...dmis.org, tglx@...utronix.de
Subject: [tip:perf/core] tools lib traceevent:
  Unregister handler when function plugin is unloaded

Commit-ID:  ac668c7b7d87c1895faf196a337b5ddfd32a0e21
Gitweb:     http://git.kernel.org/tip/ac668c7b7d87c1895faf196a337b5ddfd32a0e21
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Thu, 16 Jan 2014 11:31:09 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 16 Jan 2014 16:26:24 -0300

tools lib traceevent: Unregister handler when function plugin is unloaded

The function handler should be unregistered when the plugin is unloaded
otherwise it'll try to access invalid memory.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Reviewed-by: Jiri Olsa <jolsa@...hat.com>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung.kim@....com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/1389839478-5887-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/traceevent/plugin_function.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/lib/traceevent/plugin_function.c b/tools/lib/traceevent/plugin_function.c
index 3946148..80ba4ff 100644
--- a/tools/lib/traceevent/plugin_function.c
+++ b/tools/lib/traceevent/plugin_function.c
@@ -148,6 +148,9 @@ void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
 {
 	int i, x;
 
+	pevent_unregister_event_handler(pevent, -1, "ftrace", "function",
+					function_handler, NULL);
+
 	for (i = 0; i <= cpus; i++) {
 		for (x = 0; x < fstack[i].size && fstack[i].stack[x]; x++)
 			free(fstack[i].stack[x]);
--
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