linux-kernel - Re: [PATCH] n_tty: Remove LINEMODE support

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Message-ID: <54BD322F.1020401@hurleysoftware.com>
Date:	Mon, 19 Jan 2015 11:34:55 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Theodore Ts'o <tytso@....edu>
CC:	Howard Chu <hyc@...as.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH] n_tty: Remove LINEMODE support

Hi Ted,

On 01/18/2015 11:55 PM, Theodore Ts'o wrote:
> Line mode goes back to BSD 4.x days, and it's useful over high latency
> links --- i.e., the sort of thing that you get with stone age cellular
> data networks (i.e., the sort of thing that we still have the US),
> amateur packet radio links, etc.  So it's certianly a nice to have, if
> someone is willing to support it and the maintenance burden on the
> rest of the tty stack isn't too onerous.

I'm not philosophically opposed to Line mode support, but I am
concerned about providing a userspace interface that's not getting tested
or used or otherwise not fit for purpose. I copied you on the other email
regarding the specific deficiencies so I won't reiterate them here.

Perhaps it's fortunate that userspace didn't pick this up; otherwise,
this interface would be cast in stone.

Regards,
Peter Hurley
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