linux-kernel - Re: [PATCH v1 03/16] ufs: core: Defer adding host to scsi if mcq is supported

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Date:   Fri, 30 Sep 2022 11:32:34 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Asutosh Das <quic_asutoshd@...cinc.com>, mani@...nel.org,
        quic_nguyenb@...cinc.com, quic_xiaosenh@...cinc.com,
        quic_cang@...cinc.com, quic_nitirawa@...cinc.com,
        quic_rampraka@...cinc.com, quic_richardp@...cinc.com,
        stanley.chu@...iatek.com, adrian.hunter@...el.com,
        avri.altman@....com, beanhuo@...ron.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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 03/16] ufs: core: Defer adding host to scsi if mcq is
 supported

On 9/22/22 18:05, Asutosh Das wrote:
> @@ -8218,6 +8219,14 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
>   		ret = ufshcd_device_params_init(hba);
>   		if (ret)
>   			goto out;
> +
> +		if (is_mcq_supported(hba)) {
> +			ret = scsi_add_host(host, hba->dev);
> +			if (ret) {
> +				dev_err(hba->dev, "scsi_add_host failed\n");
> +				goto out;
> +			}
> +		}
>   	}

Calling scsi_add_host() from ufshcd_probe_hba() seems wrong to me since 
that function is not only called when probing a host controller but also 
when resetting a host controller. See also ufshcd_host_reset_and_restore().

>   
>   	ufshcd_tune_unipro_params(hba);
> @@ -9764,10 +9773,12 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
>   		hba->is_irq_enabled = true;
>   	}
>   
> -	err = scsi_add_host(host, hba->dev);
> -	if (err) {
> -		dev_err(hba->dev, "scsi_add_host failed\n");
> -		goto out_disable;
> +	if (!is_mcq_supported(hba)) {
> +		err = scsi_add_host(host, hba->dev);
> +		if (err) {
> +			dev_err(hba->dev, "scsi_add_host failed\n");
> +			goto out_disable;
> +		}
>   	}
>   
>   	hba->tmf_tag_set = (struct blk_mq_tag_set) {

Please make sure there is only a single scsi_add_host() call in the UFS 
host controller driver.

Thanks,

Bart.