RE: Re: [PATCH v16 1/3] scsi: ufs: Introduce HPB feature

[Daejun Park]

Hi Greg, Avri

> On Sat, Dec 19, 2020 at 12:48:31PM +0000, Avri Altman wrote:
> > > 
> > > 
> > > On Sat, Dec 19, 2020 at 06:18:47PM +0900, Daejun Park wrote:
> > > > +static int ufshpb_get_state(struct ufshpb_lu *hpb)
> > > > +{
> > > > +     return atomic_read(&hpb->hpb_state);
> > > > +}
> > > > +
> > > > +static void ufshpb_set_state(struct ufshpb_lu *hpb, int state)
> > > > +{
> > > > +     atomic_set(&hpb->hpb_state, state);
> > > > +}
> > > 
> > > You have a lock for the state, and yet the state is an atomic variable
> > > and you do not use the lock here at all.  You don't use the lock at all
> > > infact...
> > > 
> > > So either the lock needs to be dropped, or you need to use the lock and
> > > make the state a normal variable please.
> > hpb_state_lock is mainly protecting the list of active regions.
> > Just grep  lh_lru_rgn in patch 2/3.
> 
> Then why is the lock added in this patch if it is not used here?

I think it comes from that the name of the lock and related comment is
different from the actual usage.
I will modify the name and related comments, and introduce the lock to the
patch 2/3.

Thanks,
Daejun