linux-kernel - Re: [PATCH] scsi: ufs: core: Use readable 'return 0' in ufshcd_hba

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Message-ID: <28ea2183-d1ce-f42d-1765-9d07d7481eda@acm.org>
Date:   Tue, 2 May 2023 13:28:45 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     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: [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.

Thanks,

Bart.