linux-kernel - Re: [PATCH v3 8/9] scsi: ufs: Update the fast abort path in ufshcd

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Message-ID: <fa37645b-3c1e-2272-d492-0c2b563131b1@acm.org>
Date:   Fri, 11 Jun 2021 14:02:40 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Can Guo <cang@...eaurora.org>, asutoshd@...eaurora.org,
        nguyenb@...eaurora.org, hongwus@...eaurora.org,
        ziqichen@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....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>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 8/9] scsi: ufs: Update the fast abort path in
 ufshcd_abort() for PM requests

On 6/9/21 9:43 PM, Can Guo wrote:
> If PM requests fail during runtime suspend/resume, RPM framework saves the
> error to dev->power.runtime_error. Before the runtime_error gets cleared,
> runtime PM on this specific device won't work again, leaving the device
> either runtime active or runtime suspended permanently.
> 
> When task abort happens to a PM request sent during runtime suspend/resume,
> even if it can be successfully aborted, RPM framework anyways saves the
> (TIMEOUT) error. In this situation, we can leverage error handling to
> recover and clear the runtime_error. So, let PM requests take the fast
> abort path in ufshcd_abort().

How can a PM request fail during runtime suspend/resume? Does such a
failure perhaps indicate an UFS controller bug? I appreciate your work
but I'm wondering whether it's worth to complicate the UFS driver for
issues that should be fixed in the controller instead of in software.

Thanks,

Bart.