linux-kernel - RE: [PATCH v1 1/1] ufs: core: set SDEV

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Message-ID: <017801db1942$ba6a5bb0$2f3f1310$@samsung.com>
Date: Tue, 8 Oct 2024 14:27:12 +0900
From: "Seunghwan Baek" <sh8267.baek@...sung.com>
To: "'Bart Van Assche'" <bvanassche@....org>,
	<linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<martin.petersen@...cle.com>, <James.Bottomley@...senPartnership.com>,
	<avri.altman@....com>, <alim.akhtar@...sung.com>
Cc: <grant.jung@...sung.com>, <jt77.jang@...sung.com>,
	<junwoo80.lee@...sung.com>, <dh0421.hwang@...sung.com>,
	<jangsub.yi@...sung.com>, <sh043.lee@...sung.com>, <cw9316.lee@...sung.com>,
	<wkon.kim@...sung.com>, <stable@...r.kernel.org>, <kwmad.kim@...sung.com>,
	<sh425.lee@...sung.com>, <hy50.seo@...sung.com>, <kwangwon.min@...sung.com>,
	<h10.kim@...sung.com>
Subject: RE: [PATCH v1 1/1] ufs: core: set SDEV_OFFLINE when ufs shutdown.

> > On 9/23/24 7:17 PM, Seunghwan Baek wrote:> That's because SSU (Start
> > Stop
> > Unit) command must be sent during
> > > shutdown process. If SDEV_OFFLINE is set for wlun, SSU command
> > > cannot be sent because it is rejected by the scsi layer. Therefore,
> > > we consider to set SDEV_QUIESCE for wlun, and set SDEV_OFFLINE for
> > > other lus.
> > Right. Since ufshcd_wl_shutdown() is expected to stop all DMA related
> > to the UFS host, shouldn't there be a scsi_device_quiesce(sdev) call
> > after the __ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM) call?
> >
> > Thanks,
> >
> > Bart.
> 
> Yes. __ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM) should be called after
> scsi_device_quiesce(sdev). Generally, the SSU command is the last command
> before UFS power off. Therefore, if __ufshcd_wl_suspend is performed
> before scsi_device_quiesce, other commands may be performed after the SSU
> command and UFS may not guarantee the operation of the SSU command, which
> may cause other problems. This order must be guaranteed.
> 
> And with SDEV_QUIESCE, deadlock issue cannot be avoided due to requeue.
> We need to return the i/o error with SDEV_OFFLINE to avoid the mentioned
> deadlock problem.

(+ more CC added.)
Dear All.

Could you please update for this patch?
If you have any opinions about this patch, share and comment it.

Thanks.
BRs.