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

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Date:   Thu, 14 Dec 2023 12:57:29 -0600
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Chanwoo Lee <cw9316.lee@...sung.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        mani@...nel.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
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.

Can you be a bit specific about what you fixed here in the commit?
Both the subject and the description is vague and sounds like you're
still unsure if this change is a good idea. The review on the prior
patch and this one is indicating that this change is necessary and a
fix, so let's be more confident in the description for future readers.

Write as you please, but something like:

    scsi: ufs: qcom: Return ufs_qcom_clk_scale_*() errors in ufs_qcom_clk_scale_notify()

    In commit 031312dbc695 ("scsi: ufs: ufs-qcom: Remove unnecessary goto statements")
    the error handling was accidentally changed, resulting in the error of
    ufs_qcom_clk_scale_*() calls not being returned.

    Let's make sure those errors are properly returned.

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

This deserves a Fixes: tag (I see Mani mentioned that)

> Reviewed-by: Andrew Halaney <ahalaney@...hat.com>

I did not provide a Reviewed-by tag in v1, this is not accurate:

    https://lore.kernel.org/linux-arm-msm/m5wjp3yb3qpheyzgipekeagycboifqdpw54nquzqsftufap3yc@kxjwi4y63adj/

Outside of that this looks good, thanks!

> ---
> 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
>