linux-kernel - Re: [RFC PATCH v1] scsi: ufs: Quiesce all scsi devices before shutdown

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Date:   Thu, 2 Jul 2020 11:36:44 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Bart Van Assche <bvanassche@....org>
CC:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <jejb@...ux.ibm.com>, <beanhuo@...ron.com>,
        <asutoshd@...eaurora.org>, <cang@...eaurora.org>,
        <matthias.bgg@...il.com>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kuohong.wang@...iatek.com>,
        <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <andy.teng@...iatek.com>, <chaotian.jing@...iatek.com>,
        <cc.chou@...iatek.com>
Subject: Re: [RFC PATCH v1] scsi: ufs: Quiesce all scsi devices before
 shutdown

Hi Bart,

On Wed, 2020-07-01 at 20:02 -0700, Bart Van Assche wrote:
> On 2020-07-01 18:32, Stanley Chu wrote:
> > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> > index 59358bb75014..cadfa9006972 100644
> > --- a/drivers/scsi/ufs/ufshcd.c
> > +++ b/drivers/scsi/ufs/ufshcd.c
> > @@ -8599,10 +8599,14 @@ EXPORT_SYMBOL(ufshcd_runtime_idle);
> >  int ufshcd_shutdown(struct ufs_hba *hba)
> >  {
> >  	int ret = 0;
> > +	struct scsi_target *starget;
> >  
> >  	if (!hba->is_powered)
> >  		goto out;
> >  
> > +	list_for_each_entry(starget, &hba->host->__targets, siblings)
> > +		scsi_target_quiesce(starget);
> > +
> >  	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
> >  		goto out;
> 
> Please add a comment above the list_for_each_entry() loop that explains
> that there is no matching scsi_target_unquiesce() call and also that
> SCSI commands queued after the scsi_target_quiesce() call returned will
> block until blk_cleanup_queue() is called (see also the blk_queue_dying()
> check in blk_queue_enter()).

Thanks for the review.
I'll add above comments in RFC v2.

Thanks,
Stanley Chu