linux-kernel - Re: [PATCH 19/24] ftrace: Fix trace_add_event

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Date:	Wed, 23 Sep 2009 09:11:57 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jason Baron <jbaron@...hat.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH 19/24] ftrace: Fix trace_add_event_call() to initialize
 list

> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index ba34920..83cc2c0 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -1010,9 +1010,12 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
>  		return -ENOENT;
>  
>  	list_add(&call->list, &ftrace_events);
> -	return event_create_dir(call, d_events, &ftrace_event_id_fops,
> +	ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
>  				&ftrace_enable_fops, &ftrace_event_filter_fops,
>  				&ftrace_event_format_fops);
> +	if (ret < 0)
> +		list_del(&call->list);
> +	return ret;

seems it's a bit better to call list_add() after event_create_dir()
returns 0.

>  }
>  
>  /* Add an additional event_call dynamically */
--
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