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

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Message-ID: <c4b58912-d22e-9c35-3861-377cc78e7694@quicinc.com>
Date:   Wed, 3 May 2023 21:04:08 -0700
From:   "Bao D. Nguyen" <quic_nguyenb@...cinc.com>
To:     Bart Van Assche <bvanassche@....org>, <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 4/25/2023 5:12 PM, Bart Van Assche wrote:
> 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.
Yes. Same comment as in patch #2.

> 
>> +    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?
Same comment as in patch #1. I will change this 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.
Yes, I will change.

> 
>> +    if (lrbp->cmd)
>> +        ufshcd_release_scsi_cmd(hba, lrbp);
> 
> Same comment here - do not use lrbp->cmd to check for completion.
Yes.

> 
> Thanks,
> 
> Bart.