linux-kernel - Re: [PATCH v1 1/3] scsi: ufs: Remove a redundant command completion logic in error handler

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Date:   Mon, 24 May 2021 09:43:34 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Can Guo <cang@...eaurora.org>, asutoshd@...eaurora.org,
        nguyenb@...eaurora.org, hongwus@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3] scsi: ufs: Remove a redundant command completion
 logic in error handler

On 5/24/21 1:36 AM, Can Guo wrote:
> ufshcd_host_reset_and_restore() anyways completes all pending requests
> before starts re-probing, so there is no need to complete the command on
> the highest bit in tr_doorbell in advance.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd.c | 13 -------------
>  1 file changed, 13 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index d543864..c4b37d2 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -6123,19 +6123,6 @@ static void ufshcd_err_handler(struct work_struct *work)
>  do_reset:
>  	/* Fatal errors need reset */
>  	if (needs_reset) {
> -		unsigned long max_doorbells = (1UL << hba->nutrs) - 1;
> -
> -		/*
> -		 * ufshcd_reset_and_restore() does the link reinitialization
> -		 * which will need atleast one empty doorbell slot to send the
> -		 * device management commands (NOP and query commands).
> -		 * If there is no slot empty at this moment then free up last
> -		 * slot forcefully.
> -		 */
> -		if (hba->outstanding_reqs == max_doorbells)
> -			__ufshcd_transfer_req_compl(hba,
> -						    (1UL << (hba->nutrs - 1)));
> -
>  		hba->force_reset = false;
>  		spin_unlock_irqrestore(hba->host->host_lock, flags);
>  		err = ufshcd_reset_and_restore(hba);
> 

Reviewed-by: Bart Van Assche <bvanassche@....org>