linux-kernel - [PATCH 15/17] tools lib traceevent: Unregister handler when jbd2 plugin unloaded

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Message-Id: <1389750340-15965-16-git-send-email-namhyung@kernel.org>
Date:	Wed, 15 Jan 2014 10:45:38 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH 15/17] tools lib traceevent: Unregister handler when jbd2 plugin unloaded

The function handlers should be unregistered when the plugin unloaded
otherwise they'll try to access invalid memory.

Cc: Jiri Olsa <jolsa@...hat.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/lib/traceevent/plugin_jbd2.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/lib/traceevent/plugin_jbd2.c b/tools/lib/traceevent/plugin_jbd2.c
index 2f93f81f0bac..88fe6fe872d5 100644
--- a/tools/lib/traceevent/plugin_jbd2.c
+++ b/tools/lib/traceevent/plugin_jbd2.c
@@ -66,3 +66,14 @@ int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
 				       PEVENT_FUNC_ARG_VOID);
 	return 0;
 }
+
+void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
+{
+	pevent_unregister_print_function(pevent,
+					 process_jbd2_dev_to_name,
+					 "jbd2_dev_to_name");
+
+	pevent_unregister_print_function(pevent,
+					 process_jiffies_to_msecs,
+					 "jiffies_to_msecs");
+}
-- 
1.7.11.7

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