linux-kernel - Re: [PATCH v2 6/6] serial: Consolidate BOTH

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Message-ID: <CAHp75VdSadbtkH1JeiPuJ_CSBDq82GaRWLvJFd8Egg7poY8Lxw@mail.gmail.com>
Date:   Thu, 23 Jun 2022 12:17:58 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jiri Slaby <jirislaby@...nel.org>
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        William Hubbs <w.d.hubbs@...il.com>,
        Chris Brannon <chris@...-brannons.com>,
        Kirk Reiser <kirk@...sers.ca>,
        Samuel Thibault <samuel.thibault@...-lyon.org>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "speakup@...ux-speakup.org" <speakup@...ux-speakup.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>
Subject: Re: [PATCH v2 6/6] serial: Consolidate BOTH_EMPTY use

On Thu, Jun 23, 2022 at 12:15 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Thu, Jun 23, 2022 at 10:24 AM Jiri Slaby <jirislaby@...nel.org> wrote:
> > On 23. 06. 22, 10:11, Andy Shevchenko wrote:
> > >     * prom_putchar_wait() should be implemented using
> > >        read_poll_timeout_atomic(), incl. failure/timeout handling.
> > >
> > > Not sure since it is an early stage and scheduler might not work as
> > > expected. Conversions to iopoll.h macros bitten us a few times already.
> >
> > Except _atomic does not use scheduler :).
>
> Sorry for a bit misleading comment, but I chased it down, so this what
> I had in mind when commenting:
> be24c6a71ecf ("soc: qcom: rpmh-rsc: Don't use ktime for timeout in
> write_tcs_reg_sync()")

...and this one (specifically for early stages)

c4d936efa46d ("Revert "usb: early: convert to readl_poll_timeout_atomic()"")

> (Yes, it's about _atomic variant)
>
> Means we need to use those macros with care.

-- 
With Best Regards,
Andy Shevchenko