linux-kernel - Re: serial flow control appears broken

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Message-Id: <1185563133.23486.5.camel@x2.microgate.com>
Date:	Fri, 27 Jul 2007 14:05:33 -0500
From:	Paul Fulghum <paulkf@...rogate.com>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Lee Howard <faxguy@...ardsilvan.com>,
	linux-serial@...r.kernel.org, tytso@....edu, rmk@....linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: serial flow control appears broken

On Fri, 2007-07-27 at 12:22 -0600, Robert Hancock wrote:

> In this situation, though, it appears it's not the TTY buffers that are 
> filling but the UART's own buffer. I would think this must be caused by 
> some kind of interrupt latency that results in not draining the FIFO in 
> time.

You are right, this error is output when the character flag TTY_OVERRUN
is encountered by n_tty.c which should be set by the driver
in response to a hardware FIFO overrun (not an ldisc buffer overrun).

I can't see anyplace in serial_core.c or 8250.c that sets TTY_OVERRUN.

 
--
Paul Fulghum
Microgate Systems, Ltd

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