linux-kernel - Re: [PATCH v2 2/2] scsi: ufs: no need to send one Abort Task TM in case the task in DB was cleared

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Date:   Fri, 14 Aug 2020 17:27:47 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Bean Huo <huobean@...il.com>
Cc:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] scsi: ufs: no need to send one Abort Task TM in
 case the task in DB was cleared

On 2020-08-11 22:18, Bean Huo wrote:
> From: Bean Huo <beanhuo@...ron.com>
> 
> If the bit corresponds to a task in the Doorbell register has been
> cleared, no need to poll the status of the task on the device side
> and to send an Abort Task TM. Instead, let it directly goto cleanup.
> 
> Meanwhile, to keep original debug print, move this goto below the debug
> print.
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>

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

> ---
>  drivers/scsi/ufs/ufshcd.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 66fe814c8725..5f09cda7b21c 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -6434,14 +6434,8 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
>  		goto out;
>  	}
> 
> -	if (!(reg & (1 << tag))) {
> -		dev_err(hba->dev,
> -		"%s: cmd was completed, but without a notifying intr, tag = %d",
> -		__func__, tag);
> -	}
> -
>  	/* Print Transfer Request of aborted task */
> -	dev_err(hba->dev, "%s: Device abort task at tag %d\n", __func__, 
> tag);
> +	dev_info(hba->dev, "%s: Device abort task at tag %d\n", __func__, 
> tag);
> 
>  	/*
>  	 * Print detailed info about aborted request.
> @@ -6462,6 +6456,13 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
>  	}
>  	hba->req_abort_count++;
> 
> +	if (!(reg & (1 << tag))) {
> +		dev_err(hba->dev,
> +		"%s: cmd was completed, but without a notifying intr, tag = %d",
> +		__func__, tag);
> +		goto cleanup;
> +	}
> +
>  	/* Skip task abort in case previous aborts failed and report failure 
> */
>  	if (lrbp->req_abort_skip) {
>  		err = -EIO;