linux-kernel - Re: [PATCH v2 3/5] ufs: mcq: Added ufshcd_mcq

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Message-ID: <53f22b81-a738-8f94-8e08-2395133d0249@acm.org>
Date:   Tue, 25 Apr 2023 17:12:43 -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,
        Powen.Kao@...iatek.com, 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 v2 3/5] ufs: mcq: Added ufshcd_mcq_abort()

On 4/17/23 14:05, Bao D. Nguyen wrote:
> +	if (!lrbp->cmd) {
> +		dev_err(hba->dev,
> +			"%s: skip abort. cmd at tag %d already completed.\n",
> +			__func__, tag);
> +		goto out;
> +	}

Please do not use lrbp->cmd to check whether or not a command has completed.

> +	if (ufshcd_mcq_sqe_search(hba, hwq, tag)) {
> +		/*
> +		 * Failure. The command should not be "stuck" in SQ for
> +		 * a long time which resulted in command being aborted.
> +		 */
> +		dev_err(hba->dev, "%s: cmd found in sq. hwq=%d, tag=%d\n",
> +				__func__, hwq->id, tag);
> +		/* Set the Command Type to 0xF per the spec */
> +		ufshcd_mcq_nullify_cmd(hba, hwq);

The above looks wrong to me. How can ufshcd_mcq_nullify_cmd() identify a 
command if the 'tag' argument is not passed to that function?

> +	/*
> +	 * The command is not in the Submission Queue, and it is not
> +	 * in the Completion Queue either. Query the device to see if
> +	 * the command is being processed in the device.
> +	 */

Please only use capitals if these are required.

> +	if (lrbp->cmd)
> +		ufshcd_release_scsi_cmd(hba, lrbp);

Same comment here - do not use lrbp->cmd to check for completion.

Thanks,

Bart.