linux-kernel - Re: [PATCH 3/5] perf kvm: Fill in the missing freeing a session after an error occur

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Message-ID: <20150630111443.GA25631@krava.brq.redhat.com>
Date:	Tue, 30 Jun 2015 13:14:43 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Taeung Song <treeze.taeung@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, namhyung@...nel.org,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 3/5] perf kvm: Fill in the missing freeing a session
 after an error occur

On Tue, Jun 30, 2015 at 05:15:22PM +0900, Taeung Song wrote:
> When an error occur a error value is just returned
> without freeing the session. So allocating and freeing
> session have to be matched as a pair even if an error occur.
> 
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
> ---
>  tools/perf/builtin-kvm.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 74878cd..5fa96a0 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -1061,8 +1061,10 @@ static int read_events(struct perf_kvm_stat *kvm)
>  
>  	symbol__init(&kvm->session->header.env);
>  
> -	if (!perf_session__has_traces(kvm->session, "kvm record"))
> -		return -EINVAL;
> +	if (!perf_session__has_traces(kvm->session, "kvm record")) {
> +		ret = -EINVAL;
> +		goto out_delete;
> +	}
>  
>  	/*
>  	 * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
> @@ -1070,9 +1072,15 @@ static int read_events(struct perf_kvm_stat *kvm)
>  	 */
>  	ret = cpu_isa_config(kvm);
>  	if (ret < 0)
> -		return ret;
> +		goto out_delete;
>  
> -	return perf_session__process_events(kvm->session);
> +	ret = perf_session__process_events(kvm->session);
> +	if (ret < 0)
> +		goto out_delete;

above 2 lines are not needed.. just fall through

jirka

> +
> +out_delete:
> +	perf_session__delete(kvm->session);
> +	return ret;
>  }
>  
>  static int parse_target_str(struct perf_kvm_stat *kvm)
> -- 
> 1.9.1
> 
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