Subject: Re: Serial driver hangs
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Paul Fulghum <paulkf@microgate.com>
Cc: Russell King <rmk+lkml@arm.linux.org.uk>,
       Roland =?ISO-8859-1?Q?Ca=DFebohm?= 
	<roland.cassebohm@VisionSystems.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Mer, 2004-09-29 at 00:03, Paul Fulghum wrote:
> The alternative is to implement a flow control
> mechanism between the flip buffer layer and
> the tty drivers to (at the very least)
> enable/disable receive interrupts.

We have throttle()/unthrottle(). Drivers also know if they can't
push data.

> Since the flip buffer implementation is probably
> going to need rework anyways (eventually) along
> with the other tty locking issues, this may not
> be a trivial task.

TTY_DONT_FLIP has to die. It's already broken for many cases.
Its basically a nasty quickfix someone did ages ago

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