linux-kernel - Re: [PATCH 1/1] coresight: trbe: Fix return value check in arm_trbe_register_coresight

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Message-ID: <361f5e4b-e269-1a07-ccde-017ef713eaa1@huawei.com>
Date: Mon, 21 Oct 2024 11:57:55 +0800
From: "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To: Anshuman Khandual <anshuman.khandual@....com>, Suzuki K Poulose
	<suzuki.poulose@....com>, Mike Leach <mike.leach@...aro.org>, James Clark
	<james.clark@...aro.org>, Alexander Shishkin
	<alexander.shishkin@...ux.intel.com>, Mathieu Poirier
	<mathieu.poirier@...aro.org>, <coresight@...ts.linaro.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] coresight: trbe: Fix return value check in
 arm_trbe_register_coresight_cpu()



On 2024/10/21 10:58, Anshuman Khandual wrote:
> 
> 
> On 10/18/24 19:38, Zhen Lei wrote:
>> Function devm_kzalloc() returns NULL instead of ERR_PTR() when it fails.
> 
> Right, devm_kzalloc() calls devm_kmalloc() with additional __GFP_ZERO which
> returns NULL on error.
> 
>> The IS_ERR() test in the return value check should be replaced with NULL
>> test.
>>
>> Fixes: 39744738a67d ("coresight: trbe: Allocate platform data per device")
>> Fixes: 3fbf7f011f24 ("coresight: sink: Add TRBE driver")
> 
> Actually this problem is caused by the following commit which had replaced
> coresight_get_platform_data() with devm_kzalloc() for a dummy 'desc.pdata'
> allocation. Earlier IS_ERR() test for the return value, was correct for
> coresight_get_platform_data() which returns ERR_PTR() on error, but then
> it should have been changed for devm_kzalloc() into a NULL check instead.
> 
> 4277f035d227 ("coresight: trbe: Add a representative coresight_platform_data for TRBE")
> 
> Please add "Fixes:" tag for the above commit instead.

Yes, you're right. In retrospect, I probably found 3fbf7f011f24 just by
searching for IS_ERR(). I will update and post v2. Thanks.

> 
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> ---
>>  drivers/hwtracing/coresight/coresight-trbe.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
>> index 96a32b213669940..93fe9860acf16bd 100644
>> --- a/drivers/hwtracing/coresight/coresight-trbe.c
>> +++ b/drivers/hwtracing/coresight/coresight-trbe.c
>> @@ -1266,7 +1266,7 @@ static void arm_trbe_register_coresight_cpu(struct trbe_drvdata *drvdata, int cp
>>  	 * into the device for that purpose.
>>  	 */
>>  	desc.pdata = devm_kzalloc(dev, sizeof(*desc.pdata), GFP_KERNEL);
>> -	if (IS_ERR(desc.pdata))
>> +	if (!desc.pdata)
>>  		goto cpu_clear;
>>  
>>  	desc.type = CORESIGHT_DEV_TYPE_SINK;
> 
> Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
> 
> .
> 

-- 
Regards,
  Zhen Lei