linux-kernel - Re: [PATCH 1/2] scsi: ufs: Put SCSI host after remove it

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Date:   Mon, 16 Dec 2019 17:15:57 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     cang@...eaurora.org
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] scsi: ufs: Put SCSI host after remove it

On 12/16/19 4:46 PM, cang@...eaurora.org wrote:
> On 2019-12-17 01:39, Bart Van Assche wrote:
>> Apparently some UFS drivers call ufshcd_remove() only and others
>> (PCIe) call both ufshcd_remove() and ufshcd_dealloc_host(). I think
>> that the above change will cause trouble for the PCIe driver unless
>> the ufshcd_dealloc_host() call is removed from ufshcd_pci_remove().
>
> You may get me wrong. I mean we should do like what ufshcd-pci.c does.
> As driver probe routine allocates SCSI host, then driver remove() should
> de-allocate it. Meaning ufs_qcom_remove() should call both ufshcd_remove()
> and ufshcd_dealloc_host().
> 
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index 3d4582e..ea45756 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -3239,6 +3239,7 @@ static int ufs_qcom_remove(struct platform_device 
> *pdev)
> 
>            pm_runtime_get_sync(&(pdev)->dev);
>            ufshcd_remove(hba);
>   +       ufshcd_dealloc_host(hba);
>            return 0;
>     }

Hi Can,

If it is possible to move the ufshcd_dealloc_host() into ufshcd_remove() 
then I would prefer to do that. If all UFS transport drivers need that 
call then I think that call should happen from the UFS core instead of 
from the transport drivers.

Thanks,

Bart.