linux-kernel - Re: [PATCH] scsi: ufs: fix livelock of ufshcd_clear_ua

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Message-ID: <X+C9+1p1CbssKRdO@google.com>
Date:   Mon, 21 Dec 2020 07:23:39 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>
Subject: Re: [PATCH] scsi: ufs: fix livelock of ufshcd_clear_ua_wluns

Hi,

On 12/20, Avri Altman wrote:
> Hi J,
>  
> > 
> > When gate_work/ungate_work gets an error during hibern8_enter or exit,
> >  ufshcd_err_handler()
> >    ufshcd_scsi_block_requests()
> >    ufshcd_reset_and_restore()
> >      ufshcd_clear_ua_wluns() -> stuck
> >    ufshcd_scsi_unblock_requests()
> > 
> > In order to avoid it, ufshcd_clear_ua_wluns() can be called per recovery
> > flows
> > such as suspend/resume, link_recovery, and error_handler.
> Not sure that suspend/resume are UAC events?

Could you elaborate a bit? The goal is to clear UAC after UFS reset happens.

>  
> Also the 'fixes' tag is missing.

Added. Thanks,

> 
> Thanks,
> Avri