Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Mon, 21 Dec 2020 07:23:39 -0800
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     Avri Altman <Avri.Altman@wdc.com>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
        "kernel-team@android.com" <kernel-team@android.com>,
        "cang@codeaurora.org" <cang@codeaurora.org>,
        "alim.akhtar@samsung.com" <alim.akhtar@samsung.com>,
        "bvanassche@acm.org" <bvanassche@acm.org>,
        "martin.petersen@oracle.com" <martin.petersen@oracle.com>,
        "stanley.chu@mediatek.com" <stanley.chu@mediatek.com>
Subject: Re: [PATCH] scsi: ufs: fix livelock of ufshcd_clear_ua_wluns
Message-ID: <X+C9+1p1CbssKRdO@google.com>
References: <20201218033131.2624065-1-jaegeuk@kernel.org>
 <DM6PR04MB6575B8729A62E6FB9F19930CFCC10@DM6PR04MB6575.namprd04.prod.outlook.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <DM6PR04MB6575B8729A62E6FB9F19930CFCC10@DM6PR04MB6575.namprd04.prod.outlook.com>
Precedence: bulk

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