linux-kernel - Re: [RFC PATCH v1 4/4] ufs: mcq: Added ufshcd_mcq

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Date:   Wed, 8 Mar 2023 11:02:15 -0800
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: [RFC PATCH v1 4/4] ufs: mcq: Added ufshcd_mcq_abort()

On 3/7/23 20:01, Bao D. Nguyen wrote:
> +	if (ufshcd_mcq_cqe_search(hba, hwq, tag)) {
> +		dev_err(hba->dev, "%s: cmd found in cq. hwq=%d, tag=%d\n",
> +				__func__, hwq->id, tag);
> +		/*
> +		 * The command should not be 'stuck' in the CQ for such a long time.
> +		 * Is interrupt missing? Process the CQEs here. If the interrupt is
> +		 * invoked at a later time, the CQ will be empty because the CQEs
> +		 * are already processed here.
> +		 */
> +		ufshcd_mcq_poll_cqe_lock(hba, hwq);
> +		err = SUCCESS;
> +		goto out;
> +	}

Please remove the above code and also the definition of the 
ufshcd_mcq_cqe_search() function. The SCSI error handler submits an 
abort to deal with command processing timeouts. ufshcd_mcq_cqe_search() 
can only return true in case of a software bug at the host side. 
Addressing such bugs is out of scope for the SCSI error handler.

Thanks,

Bart.