linux-kernel - Re: [PATCH 1/8] scsi: ufshpb: Cache HPB Control mode on init

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Date:   Sun, 31 Jan 2021 08:13:00 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Avri Altman <Avri.Altman@....com>
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>,
        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>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>
Subject: Re: [PATCH 1/8] scsi: ufshpb: Cache HPB Control mode on init

On Sun, Jan 31, 2021 at 07:08:00AM +0000, Avri Altman wrote:
> > >
> > > +static enum UFSHPB_MODE ufshpb_mode;
> > 
> > How are you allowed to have a single variable for a device-specific
> > thing?  What happens when you have two controllers or disks or whatever
> > you are binding to here?  How does this work at all?
> > 
> > This should be per-device, right?
> Right. Done.
> 
> Not being bickering,  AFAIK, there aren't, nor will be in the foreseen future, any multi-ufs-hosts designs.

Why not?  What prevents someone from putting 2 PCI ufs host controllers
in a system tomorrow?

> There were some talks in the past about ufs cards, but this is officially off the table.

Never say never :)

Seriously, how can you somehow ensure that a random manufacturer will
not do this?

thanks,

greg k-h