linux-kernel - Re: [PATCH v2] scsi: ufs: fix livelock of ufshcd_clear_ua

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Date:   Tue, 5 Jan 2021 20:28:26 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, cang@...eaurora.org,
        alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
        stanley.chu@...iatek.com
Subject: Re: [PATCH v2] scsi: ufs: fix livelock of ufshcd_clear_ua_wluns

On 01/05, Martin K. Petersen wrote:
> 
> Jaegeuk,
> 
> > 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.
> >
> > Fixes: 1918651f2d7e ("scsi: ufs: Clear UAC for RPMB after ufshcd resets")
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> 
> Please resubmit instead of replying to an existing patch. Both b4 and
> patchwork get confused.

Ok, I posted a new one. Thanks,

> 
> Thanks!
> 
> -- 
> Martin K. Petersen	Oracle Linux Engineering