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

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Message-ID: <15afb253-1726-d26a-5e1d-5902d3c88f5d@acm.org>
Date:   Mon, 16 Dec 2019 09:44:51 -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 12/15/19 7:12 PM, cang@...eaurora.org wrote:
> Sure, I will add the Fixes tag and rebase my changes. How about the logic
> part of this change? Does it look good to you?

Hi Can,

You may want to ask someone who is more familiar with the UFS driver 
than I to have a look. I'm not a UFS expert ...

> Sorry I was not aware of that your changes have been applied to 
> 5.6/scsi-queue.
> I am still trying to get it tested on my setups...
> Anyways, aside of hba->cmd_queue, tearing down hba->tmf_queue before
> scsi_remove_host() may be problem too. Requests can still be
> sent before and during scsi_remove_host(). If a request timed out,
> task abort will be invoked to abort the request, during which
> hba->tmf_queue is expected to be present. Please correct me if I am wrong.

I agree that the code I added in ufshcd_remove() probably needs to be 
moved somewhere below the scsi_remove_host() call.

Thanks,

Bart.