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Date: Tue, 8 Apr 2008 23:13:48 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org,
       Paul Hardwick <p.hardwick@option.com>
Subject: Re: [PATCH] tty/serial: Lay the foundations for the next set of
 reworks
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> Well, how exactly the card behaves on 1 byte write? And how did the .write 
> protect against it?

One byte writes work fine via the write path and already occur. I suspect
the original author forgot to turn echo off and saw fun things happening
between the inbuilt modem emulation and the Linux side.