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

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Date:	Thu, 15 Jan 2009 11:32:17 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Li Zefan" <lizf@...fujitsu.com>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: [PATCH] tracing/ftrace: add missing unlock in register_stat_tracer()

2009/1/15 Li Zefan <lizf@...fujitsu.com>:
> We should unlock all_stat_sessions_mutex before returning failure.


Ouch.... Thanks Li!


> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> ---
>
> I noticed Ingo tend to delete the impact line from my changelog
> if it added nothing new to the title, so no impact line for this
> patch. :)
>
> ---
>  kernel/trace/trace_stat.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
>
> 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);
>
> --
> 1.5.4.rc3
>
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