linux-kernel - Re: [PATCH v1 1/2] scsi: ufs: Simplify completion timestamp for SCSI and query commands

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Message-ID: <57a4128b5f620c2bac7c55a73074a6a7@codeaurora.org>
Date:   Tue, 14 Jul 2020 17:18:56 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        avri.altman@....com, alim.akhtar@...sung.com, jejb@...ux.ibm.com,
        bvanassche@....org, beanhuo@...ron.com, asutoshd@...eaurora.org,
        matthias.bgg@...il.com, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kuohong.wang@...iatek.com, peter.wang@...iatek.com,
        chun-hung.wu@...iatek.com, andy.teng@...iatek.com,
        chaotian.jing@...iatek.com, cc.chou@...iatek.com
Subject: Re: [PATCH v1 1/2] scsi: ufs: Simplify completion timestamp for SCSI
 and query commands

On 2020-07-06 14:07, Stanley Chu wrote:
> Simplify recording command completion time in
> __ufshcd_transfer_req_compl() by assigning lrbp->compl_time_stamp
> in an unified location.
> 
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>

Reviewed-by: Can Guo <cang@...eaurora.org>

> ---
>  drivers/scsi/ufs/ufshcd.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 18da2d64f9fa..71e8d7c782bd 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -4881,6 +4881,7 @@ static void __ufshcd_transfer_req_compl(struct
> ufs_hba *hba,
> 
>  	for_each_set_bit(index, &completed_reqs, hba->nutrs) {
>  		lrbp = &hba->lrb[index];
> +		lrbp->compl_time_stamp = ktime_get();
>  		cmd = lrbp->cmd;
>  		if (cmd) {
>  			ufshcd_add_command_trace(hba, index, "complete");
> @@ -4889,13 +4890,11 @@ static void __ufshcd_transfer_req_compl(struct
> ufs_hba *hba,
>  			cmd->result = result;
>  			/* Mark completed command as NULL in LRB */
>  			lrbp->cmd = NULL;
> -			lrbp->compl_time_stamp = ktime_get();
>  			/* Do not touch lrbp after scsi done */
>  			cmd->scsi_done(cmd);
>  			__ufshcd_release(hba);
>  		} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
>  			lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
> -			lrbp->compl_time_stamp = ktime_get();
>  			if (hba->dev_cmd.complete) {
>  				ufshcd_add_command_trace(hba, index,
>  						"dev_complete");