linux-kernel - Re: [PATCH 27/30] tools lib traceevent: Carve out events format parsing routine

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Date:	Tue, 25 Sep 2012 13:15:05 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 27/30] tools lib traceevent: Carve out events format parsing routine

On Mon, 24 Sep 2012 12:59:41 -0300, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> The pevent_parse_event() routine will parse a events/sys/tp/format file
> and add an event_format instance to the pevent struct.
>
> This patch introduces a pevent_parse_format() routine with just the bits
> needed to parse the event/sys/tp/format file and just return the
> event_format instance, useful for when all we want is to parse the
> format file, without requiring the pevent struct.
[snip]
> +enum pevent_errno pevent_parse_event(struct pevent *pevent, const char *buf,
> +				     unsigned long size, const char *sys)
> +{
> +	struct event_format *event = NULL;
> +	int ret = __pevent_parse_format(&event, pevent, buf, size, sys);
> +
> +	if (event == NULL)
> +		return ret;
> +
> +	/* Add pevent to event so that it can be referenced */
> +	event->pevent = pevent;
> +
> +	if (add_event(pevent, event))
> +		goto event_add_failed;

It seems we should set the 'ret' to a proper pevent_errno -
PEVENT_ERRNO__MEM_ALLOC_FAILED.


> +
> +#define PRINT_ARGS 0
> +	if (PRINT_ARGS && event->print_fmt.args)
> +		print_args(event->print_fmt.args);
> +
> +	return 0;
> +
> +event_add_failed:
> +	free(event->system);
> +	free(event->name);
> +	free(event);

At this point, the 'event' also has fields and format information and
they all need to be freed.  Looks like calling pevent_free_format()
would be the right thing IMHO.

Thanks,
Namhyung

>  	return ret;
>  }
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