linux-kernel - Re: [PATCH] tty: serial: qcom_geni

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Message-ID: <154342275484.88331.11625853632580952641@swboyd.mtv.corp.google.com>
Date:   Wed, 28 Nov 2018 08:32:34 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Ryan Case <ryandcase@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Evan Green <evgreen@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH] tty: serial: qcom_geni_serial: Fix softlock

Quoting Ryan Case (2018-11-27 18:37:15)
> On Tue, Nov 27, 2018 at 6:04 PM Stephen Boyd <swboyd@...omium.org> wrote:
> >
> > Quoting Ryan Case (2018-11-27 17:24:44)
> >
> > > I hope underflow is impossible as well. However, if the hardware did
> > > wind up in a strange state I wanted to err on the side of not throwing
> > > away data and being able to resume later if things recovered. I can
> > > remove the defensive checks if that's the custom, otherwise I'll
> > > update the comparison logic accordingly.
> >
> > Well it looks like impossible code because an unsigned value can't be
> > less than zero. So it's not about customs, more about dead code removal.
> 
> Agreed on the current dead code aspect which is why I offered the
> option of updating the comparison logic, but I can just delete it if
> you want.

Ok, got it.