linux-kernel - RE: RE: [PATCH v22 3/4] scsi: ufs: Prepare HPB read for cached sub-region

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Date:   Tue, 23 Feb 2021 09:07:22 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "bvanassche@....org" <bvanassche@....org>,
        "huobean@...il.com" <huobean@...il.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        JinHwan Park <jh.i.park@...sung.com>,
        SEUNGUK SHIN <seunguk.shin@...sung.com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        BoRam Shin <boram.shin@...sung.com>
Subject: RE: RE: [PATCH v22 3/4] scsi: ufs: Prepare HPB read for cached
 sub-region

> 
> 
> > > +       err = ufshpb_fill_ppn_from_page(hpb, srgn->mctx, srgn_offset, 1,
> &ppn);
> > > +       spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> > > +       if (unlikely(err < 0)) {
> > > +               /*
> > > +                * In this case, the region state is active,
> > > +                * but the ppn table is not allocated.
> > > +                * Make sure that ppn table must be allocated on
> > > +                * active state.
> > > +                */
> > > +               WARN_ON(true);
> > > +               dev_err(hba->dev, "get ppn failed. err %d\n", err);
> > Maybe just pr_warn instead of risking crashing the machine over that?
> 
> Why it crashing the machine? WARN_ON will just print kernel message.
I think that it can be configured, but I am not sure.

> 
> Thanks,
> Daejun