linux-kernel - Re: [PATCH v2 4/5] perf mem: Fill in the missing freeing a session after an error occur

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Date:	Wed, 01 Jul 2015 13:58:23 +0900
From:	taeung <treeze.taeung@...il.com>
To:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
CC:	linux-kernel@...r.kernel.org, jolsa@...hat.com,
	namhyung@...nel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2 4/5] perf mem: Fill in the missing freeing a session
 after an error occur



On 07/01/2015 04:57 AM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Jul 01, 2015 at 12:18:45AM +0900, Taeung Song escreveu:
>> 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-mem.c | 18 ++++++++----------
>>   1 file changed, 8 insertions(+), 10 deletions(-)
>>
>> diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
>> index da2ec06..a914ef7 100644
>> --- a/tools/perf/builtin-mem.c
>> +++ b/tools/perf/builtin-mem.c
>> @@ -124,7 +124,6 @@ static int report_raw_events(struct perf_mem *mem)
>>   		.mode = PERF_DATA_MODE_READ,
>>   		.force = mem->force,
>>   	};
>> -	int err = -EINVAL;
>>   	int ret;
>>   	struct perf_session *session = perf_session__new(&file, false,
>>   							 &mem->tool);
>> @@ -135,24 +134,23 @@ static int report_raw_events(struct perf_mem *mem)
>>   	if (mem->cpu_list) {
>>   		ret = perf_session__cpu_bitmap(session, mem->cpu_list,
>>   					       mem->cpu_bitmap);
>> -		if (ret)
>> +		if (ret) {
>> +			ret = -EINVAL;
> Why not propagate perf_session__cpu_bitmap() return, this function
> wasn't being consistent in returning errors, neither was you, as, see
> below...

perf_session__cpu_bitmap()
when an error occurs in this function, a error value which is -1 is returned.
Therefore, this conditional sentence 'if (ret)' have to be changed to 'if (ret < 0)' as below.

- if (ret)
+ if (ret < 0)
	goto out_delete;

Is it what you say ?


-- 
Thanks,
Taeung

>
>>   			goto out_delete;
>> +		}
>>   	}
>>   
>> -	if (symbol__init(&session->header.env) < 0)
>> -		return -1;
>> +	ret = symbol__init(&session->header.env);
>> +	if (ret < 0)
>> +		goto out_delete;
> Here you decided to propagate symbol__init() error return. :-)
>
> I applied all the others, including the 3/5 v2 one.
>
> Thanks,
>
> - Arnaldo
>
>>   
>>   	printf("# PID, TID, IP, ADDR, LOCAL WEIGHT, DSRC, SYMBOL\n");
>>   
>> -	err = perf_session__process_events(session);
>> -	if (err)
>> -		return err;
>> -
>> -	return 0;
>> +	ret = perf_session__process_events(session);
>>   
>>   out_delete:
>>   	perf_session__delete(session);
>> -	return err;
>> +	return ret;
>>   }
>>   
>>   static int report_events(int argc, const char **argv, struct perf_mem *mem)
>> -- 
>> 1.9.1
--
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