linux-kernel - Re: [PATCH v1 1/1] ufs: mcq: qcom: Fix Smatch static checker warning

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Date:   Wed, 1 Mar 2023 10:13:19 -0800
From:   Asutosh Das <quic_asutoshd@...cinc.com>
To:     Manivannan Sadhasivam <mani@...nel.org>
CC:     <quic_cang@...cinc.com>, <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>, <quic_nguyenb@...cinc.com>,
        <quic_xiaosenh@...cinc.com>, <stanley.chu@...iatek.com>,
        <adrian.hunter@...el.com>, <bvanassche@....org>,
        <avri.altman@....com>, <beanhuo@...ron.com>,
        <linux-arm-msm@...r.kernel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "open list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] ufs: mcq: qcom: Fix Smatch static checker warning

On Wed, Mar 01 2023 at 23:05 -0800, Manivannan Sadhasivam wrote:
>On Tue, Feb 28, 2023 at 10:27:06AM -0800, Asutosh Das wrote:
>> The patch (c263b4ef737e: "scsi: ufs: core: mcq: Configure resource
>> regions") from Jan 13, 2023, leads to the following Smatch static
>> checker warning:
>>
>> drivers/ufs/host/ufs-qcom.c:1455 ufs_qcom_mcq_config_resource() warn:
>> passing zero to 'PTR_ERR'
>> drivers/ufs/host/ufs-qcom.c:1469 ufs_qcom_mcq_config_resource() info:
>> returning a literal zero is cleaner
>>
>> Fix the above warnings.
>>
>
>You should not name the subject after the tool that used to find the issues.
>Instead, subject should mention the actual issue like fixing return values,
>removing the devm_kfree in error path etc...
>
>Provided that, you should also split this patch into two as you are fixing
>two independent issues.
>
>Thanks,
>Mani
>

Thanks for taking a look.
I will fix it in the next version.

-Asd

>> Fixes: c263b4ef737e ("scsi: ufs: core: mcq: Configure resource regions")
>> Reported-by: Dan Carpenter <error27@...il.com>
>> Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>
>> ---
>>  drivers/ufs/host/ufs-qcom.c | 8 +++-----
>>  1 file changed, 3 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
>> index 34fc453f3eb1..cb20c7136c2c 100644
>> --- a/drivers/ufs/host/ufs-qcom.c
>> +++ b/drivers/ufs/host/ufs-qcom.c
>> @@ -1451,8 +1451,8 @@ static int ufs_qcom_mcq_config_resource(struct ufs_hba *hba)
>>  		if (IS_ERR(res->base)) {
>>  			dev_err(hba->dev, "Failed to map res %s, err=%d\n",
>>  					 res->name, (int)PTR_ERR(res->base));
>> -			res->base = NULL;
>>  			ret = PTR_ERR(res->base);
>> +			res->base = NULL;
>>  			return ret;
>>  		}
>>  	}
>> @@ -1466,7 +1466,7 @@ static int ufs_qcom_mcq_config_resource(struct ufs_hba *hba)
>>  	/* Explicitly allocate MCQ resource from ufs_mem */
>>  	res_mcq = devm_kzalloc(hba->dev, sizeof(*res_mcq), GFP_KERNEL);
>>  	if (!res_mcq)
>> -		return ret;
>> +		return -ENOMEM;
>>
>>  	res_mcq->start = res_mem->start +
>>  			 MCQ_SQATTR_OFFSET(hba->mcq_capabilities);
>> @@ -1478,7 +1478,7 @@ static int ufs_qcom_mcq_config_resource(struct ufs_hba *hba)
>>  	if (ret) {
>>  		dev_err(hba->dev, "Failed to insert MCQ resource, err=%d\n",
>>  			ret);
>> -		goto insert_res_err;
>> +		return ret;
>>  	}
>>
>>  	res->base = devm_ioremap_resource(hba->dev, res_mcq);
>> @@ -1495,8 +1495,6 @@ static int ufs_qcom_mcq_config_resource(struct ufs_hba *hba)
>>  ioremap_err:
>>  	res->base = NULL;
>>  	remove_resource(res_mcq);
>> -insert_res_err:
>> -	devm_kfree(hba->dev, res_mcq);
>>  	return ret;
>>  }
>>
>> --
>> 2.7.4
>>
>
>-- 
>மணிவண்ணன் சதாசிவம்