linux-kernel - Re: [PATCH v2] scsi: ufs: qcom: Re-fix for error handling

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Message-ID: <20231214120459.GD48078@thinkpad>
Date:   Thu, 14 Dec 2023 17:34:59 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Chanwoo Lee <cw9316.lee@...sung.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        p.zabel@...gutronix.de, linux-arm-msm@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        grant.jung@...sung.com, jt77.jang@...sung.com,
        dh0421.hwang@...sung.com, sh043.lee@...sung.com,
        Andrew Halaney <ahalaney@...hat.com>
Subject: Re: [PATCH v2] scsi: ufs: qcom: Re-fix for error handling

On Thu, Dec 14, 2023 at 11:14:01AM +0900, Chanwoo Lee wrote:
> From: ChanWoo Lee <cw9316.lee@...sung.com>
> 
> I modified the code to handle errors.
> 
> The error handling code has been changed from the patch below.
> -'commit 031312dbc695 ("scsi: ufs: ufs-qcom: Remove unnecessary goto statements")'
> 
> This is the case I checked.
> * ufs_qcom_clk_scale_notify -> 'ufs_qcom_clk_scale_up_/down_pre_change' error -> return 0;
> 
> It is unknown whether the above commit was intended to change error handling.
> However, if it is not an intended fix, a patch may be needed.
> 

Fixes: 031312dbc695 ("scsi: ufs: ufs-qcom: Remove unnecessary goto statements")

> Signed-off-by: ChanWoo Lee <cw9316.lee@...sung.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks for spotting and fixing the issue! This is one of the reasons why the
error path should directly return instead of slipping.

- Mani

> Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
> ---
> v1->v2: Remove things already in progress
>  1) ufs_qcom_host_reset -> 'reset_control_deassert' error -> return 0;
>    -> https://lore.kernel.org/linux-arm-msm/20231208065902.11006-8-manivannan.sadhasivam@linaro.org/#t
>  2) ufs_qcom_init_lane_clks -> 'ufs_qcom_host_clk_get(tx_lane1_sync_clk)' error -> return 0;
>    -> https://lore.kernel.org/linux-arm-msm/20231208065902.11006-2-manivannan.sadhasivam@linaro.org/
> ---
> ---
>  drivers/ufs/host/ufs-qcom.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 96cb8b5b4e66..17e24270477d 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1516,9 +1516,11 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
>  			err = ufs_qcom_clk_scale_up_pre_change(hba);
>  		else
>  			err = ufs_qcom_clk_scale_down_pre_change(hba);
> -		if (err)
> -			ufshcd_uic_hibern8_exit(hba);
>  
> +		if (err) {
> +			ufshcd_uic_hibern8_exit(hba);
> +			return err;
> +		}
>  	} else {
>  		if (scale_up)
>  			err = ufs_qcom_clk_scale_up_post_change(hba);
> -- 
> 2.29.0
> 
> 

-- 
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