linux-kernel - RE: [PATCH v7 06/11] scsi: ufshpb: Region inactivation in host mode

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Date:   Sat, 10 Apr 2021 01:09:45 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Avri Altman <Avri.Altman@....com>, Can Guo <cang@...eaurora.org>
CC:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Bart Van Assche <bvanassche@....org>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Daejun Park <daejun7.park@...sung.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        Zang Leigang <zangleigang@...ilicon.com>,
        Avi Shchislowski <Avi.Shchislowski@....com>,
        Bean Huo <beanhuo@...ron.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>
Subject: RE: [PATCH v7 06/11] scsi: ufshpb: Region inactivation in host mode


> > >> On 2021-04-06 13:20, Avri Altman wrote:
> > >> >> > -static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
> > >> >> > -                               struct ufshpb_region *rgn)
> > >> >> > +static int __ufshpb_evict_region(struct ufshpb_lu *hpb,
> > >> >> > +                              struct ufshpb_region *rgn)
> > >> >> >  {
> > >> >> >       struct victim_select_info *lru_info;
> > >> >> >       struct ufshpb_subregion *srgn;
> > >> >> >       int srgn_idx;
> > >> >> >
> > >> >> > +     lockdep_assert_held(&hpb->rgn_state_lock);
> > >> >> > +
> > >> >> > +     if (hpb->is_hcm) {
> > >> >> > +             unsigned long flags;
> > >> >> > +             int ret;
> > >> >> > +
> > >> >> > +             spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> > >> >>
> > >> >> Never seen a usage like this... Here flags is used without being
> > >> >> intialized.
> > >> >> The flag is needed when spin_unlock_irqrestore ->
> > >> >> local_irq_restore(flags) to
> > >> >> restore the DAIF register (in terms of ARM).
> > >> > OK.
> > >>
> > >> Hi Avri,
> > >>
> > >> Checked on my setup, this lead to compilation error. Will you fix it
> > >> in
> > >> next version?
> > >>
> > >> warning: variable 'flags' is uninitialized when used here
> > >> [-Wuninitialized]
> > > Yeah - I will pass it to __ufshpb_evict_region and drop the
> > > lockdep_assert call.
Please ignore it.  This of course won't do.
Will fix it in v8.

Thanks,
Avri