linux-kernel - RE:(2) [PATCH] scsi: ufs: core: Use readable 'return 0' in ufshcd_hba

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Date:   Wed, 03 May 2023 15:50:01 +0900
From:   Keoseong Park <keosung.park@...sung.com>
To:     Bart Van Assche <bvanassche@....org>,
        Keoseong Park <keosung.park@...sung.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "mani@...nel.org" <mani@...nel.org>,
        "quic_asutoshd@...cinc.com" <quic_asutoshd@...cinc.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE:(2) [PATCH] scsi: ufs: core: Use readable 'return 0' in
 ufshcd_hba_capabilities()

>On 5/2/23 04:31, Keoseong Park wrote:
>> The 'err' variable is the result of ufshcd_hba_init_crypto_capabilities()
>> regardless of MCQ capabilities. Return 'err' immediately when the function
>> error occurs. And if it is not an error, explicitly return 0.
>> 
>> Anyway, if ufshcd_hba_init_crypto_capabilities() returns error, MCQ
>> capabilities is not used because it fails to initialize UFS driver.
>> 
>> Signed-off-by: Keoseong Park <keosung.park@...sung.com>
>> ---
>>   drivers/ufs/core/ufshcd.c | 8 +++++---
>>   1 file changed, 5 insertions(+), 3 deletions(-)
>> 
>> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
>> index 9434328ba323..44328eb4158d 100644
>> --- a/drivers/ufs/core/ufshcd.c
>> +++ b/drivers/ufs/core/ufshcd.c
>> @@ -2343,18 +2343,20 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
>>   
>>   	/* Read crypto capabilities */
>>   	err = ufshcd_hba_init_crypto_capabilities(hba);
>> -	if (err)
>> +	if (err) {
>>   		dev_err(hba->dev, "crypto setup failed\n");
>> +		return err;
>> +	}
>>   
>>   	hba->mcq_sup = FIELD_GET(MASK_MCQ_SUPPORT, hba->capabilities);
>>   	if (!hba->mcq_sup)
>> -		return err;
>> +		return 0;
>>   
>>   	hba->mcq_capabilities = ufshcd_readl(hba, REG_MCQCAP);
>>   	hba->ext_iid_sup = FIELD_GET(MASK_EXT_IID_SUPPORT,
>>   				     hba->mcq_capabilities);
>>   
>> -	return err;
>> +	return 0;
>>   }
>
>The most important change in this patch is that ufshcd_hba_capabilities()
>returns earlier if ufshcd_hba_init_crypto_capabilities() fails. Please
>change the patch title such that it reflects this change instead of the
>other less important change.

OK, I will change it.

Best Regards,
Keoseong

>
>Thanks,
>
>Bart.