linux-kernel - Re: [PATCH v3 4/7] ufs: mcq: Add support for clean up mcq resources

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Message-ID: <590cbc0e-51a5-5738-cb2e-7619adf2e4be@acm.org>
Date:   Wed, 10 May 2023 15:00:57 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     "Bao D. Nguyen" <quic_nguyenb@...cinc.com>,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com, mani@...nel.org,
        stanley.chu@...iatek.com, adrian.hunter@...el.com,
        beanhuo@...ron.com, avri.altman@....com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Arthur Simchaev <Arthur.Simchaev@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/7] ufs: mcq: Add support for clean up mcq resources

On 5/9/23 22:24, Bao D. Nguyen wrote:
> +bool ufshcd_cmd_inflight(struct scsi_cmnd *cmd)
> +{
> +	struct request *rq;
> +
> +	if (!cmd)
> +		return false;
> +
> +	rq = scsi_cmd_to_rq(cmd);
> +	if (!rq || !blk_mq_request_started(rq))
> +		return false;
> +
> +	return true;

The return value of scsi_cmd_to_rq() is never NULL so please remove the 
!rq test.

> @@ -7450,8 +7499,8 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
>   
>   	ufshcd_hold(hba, false);
>   	reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
> -	/* If command is already aborted/completed, return FAILED. */
> -	if (!(test_bit(tag, &hba->outstanding_reqs))) {
> +	if (!is_mcq_enabled(hba) && !test_bit(tag, &hba->outstanding_reqs)) {
> +		/* If command is already aborted/completed, return FAILED. */
>   		dev_err(hba->dev,
>   			"%s: cmd at tag %d already completed, outstanding=0x%lx, doorbell=0x%x\n",
>   			__func__, tag, hba->outstanding_reqs, reg);

With the above change, the doorbell register is read even in MCQ mode. 
Shouldn't reading the doorbell register be skipped in MCQ mode?

Thanks,

Bart.