linux-kernel - Re: [PATCH] Revert "serial: 8250: Fix clearing FIFOs in RS485 mode again"

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Date:   Mon, 17 Dec 2018 16:18:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Paul Burton <paul.burton@...s.com>
Cc:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Marek Vasut <marex@...x.de>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paul Burton <pburton@...ecomp.com>,
        Daniel Jedrychowski <avistel@...il.com>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: Re: [PATCH] Revert "serial: 8250: Fix clearing FIFOs in RS485 mode
 again"

On Sun, Dec 16, 2018 at 10:35:12PM +0000, Paul Burton wrote:
> Hi Ezequiel,
> 
> On Sun, Dec 16, 2018 at 07:28:22PM -0300, Ezequiel Garcia wrote:
> > On Sun, 16 Dec 2018 at 19:24, Paul Burton <paul.burton@...s.com> wrote:
> > > This helps, but it only addresses one part of one of the 4 reasons I
> > > listed as motivation for my revert. For example serial8250_do_shutdown()
> > > also clearly intends to disable the FIFOs.
> > >
> > 
> > OK. So, let's fix that :-)
> 
> I already did, or at least tried to, on Thursday [1].
> 
> > By all means, it would be really nice to push forward and fix the garbage
> > issue on JZ4780, as well as the transmission issue on AM335x.
> >
> > AM335x is a wildly popular platform, and it's not funny to break it.
> 
> Well, clearly not if it was broken in v4.10 & only just fixed..? And
> from Marek's commit message the patch in v4.10 doesn't break the whole
> system just RS485.
> 
> > So, let's please stop discussing which board we'll break and just fix both.
> 
> I completely agree that would be ideal and I wrote a patch hoping to do
> that on Thursday, but didn't get any response on testing. It's late in
> the cycle hence a revert made sense. Simple as that.

A revert makes sense now, I'll go queue this up, thanks.

greg k-h