linux-kernel - Re: [PATCH] amd/pds_core: core: No need for Null pointer check before kfree

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Date:   Wed, 25 Oct 2023 17:09:21 +0530
From:   Bragatheswaran Manickavel <bragathemanick0908@...il.com>
To:     Wojciech Drewek <wojciech.drewek@...el.com>,
        shannon.nelson@....com, brett.creeley@....com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] amd/pds_core: core: No need for Null pointer check before
 kfree

Thanks Shannon!

On 25/10/23 14:52, Wojciech Drewek wrote:
>
> On 24.10.2023 20:20, Bragatheswaran Manickavel wrote:
>> kfree()/vfree() internally perform NULL check on the
>> pointer handed to it and take no action if it indeed is
>> NULL. Hence there is no need for a pre-check of the memory
>> pointer before handing it to kfree()/vfree().
>>
>> Issue reported by ifnullfree.cocci Coccinelle semantic
>> patch script.
>>
>> Signed-off-by: Bragatheswaran Manickavel <bragathemanick0908@...il.com>
>> ---
> Thanks for the patch!
> One nit, you're missing a target tag. It should be [PATCH net-next] since this not a fix IMO.
> Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
Hi Wojciech,
Will take care of this next time. Thanks!
>>   drivers/net/ethernet/amd/pds_core/core.c | 7 ++-----
>>   1 file changed, 2 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/amd/pds_core/core.c b/drivers/net/ethernet/amd/pds_core/core.c
>> index 2a8643e167e1..0d2091e9eb28 100644
>> --- a/drivers/net/ethernet/amd/pds_core/core.c
>> +++ b/drivers/net/ethernet/amd/pds_core/core.c
>> @@ -152,11 +152,8 @@ void pdsc_qcq_free(struct pdsc *pdsc, struct pdsc_qcq *qcq)
>>   		dma_free_coherent(dev, qcq->cq_size,
>>   				  qcq->cq_base, qcq->cq_base_pa);
>>   
>> -	if (qcq->cq.info)
>> -		vfree(qcq->cq.info);
>> -
>> -	if (qcq->q.info)
>> -		vfree(qcq->q.info);
>> +	vfree(qcq->cq.info);
>> +	vfree(qcq->q.info);
>>   
>>   	memset(qcq, 0, sizeof(*qcq));
>>   }