linux-kernel - Re: [RFC PATCH v2 2/2] scsi: ufs: Fix deadlock while suspending ufs host

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Date:   Thu, 28 Jan 2021 08:39:59 -0800
From:   Asutosh Das <asutoshd@...eaurora.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     "cang@...eaurora.org" <cang@...eaurora.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        "Bao D . Nguyen" <nguyenb@...eaurora.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 2/2] scsi: ufs: Fix deadlock while suspending ufs
 host

On Thu, Jan 28 2021 at 04:21 -0800, Avri Altman wrote:
>>
>> During runtime-suspend of ufs host, the scsi devices are
>> already suspended and so are the queues associated with them.
>> But the ufs host sends SSU to wlun during its runtime-suspend.
>Do you possible meant: "sends request-sense while clearing UAC to...."
>

The idea was to show that there's a scsi command that's sent during
suspend which may deadlock.

Yes, I agree to your comment and would change the message to reflect it in
the next version.

>
>Thanks,
>Avri