linux-kernel - [PATCH] tracing/ftrace: add missing unlock in register_stat

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Date:	Wed, 14 Jan 2009 20:57:53 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
cc:	Ingo Molnar <mingo@...e.hu>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] tracing/ftrace: add missing unlock in
 register_stat_tracer()


Ingo,

The following patch is in:

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git

    branch: tip/devel


Li Zefan (1):
      tracing/ftrace: add missing unlock in register_stat_tracer()

----
 kernel/trace/trace_stat.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---------------------------
commit 6af81ac4701bf80dde4b723f28a777daefdf512c
Author: Li Zefan <lizf@...fujitsu.com>
Date:   Thu Jan 15 09:30:52 2009 +0800

    tracing/ftrace: add missing unlock in register_stat_tracer()
    
    We should unlock all_stat_sessions_mutex before returning failure.
    
    Signed-off-by: Li Zefan <lizf@...fujitsu.com>
    Signed-off-by: Steven Rostedt <srostedt@...hat.com>

diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index cb29282..8669f3c 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -73,8 +73,10 @@ int register_stat_tracer(struct tracer_stat *trace)
 	/* Already registered? */
 	mutex_lock(&all_stat_sessions_mutex);
 	list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
-		if (node->ts == trace)
+		if (node->ts == trace) {
+			mutex_unlock(all_stat_sessions_mutex);
 			return -EINVAL;
+		}
 	}
 	mutex_unlock(&all_stat_sessions_mutex);
 

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