linux-kernel - Re: serial flow control appears broken

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Message-Id: <1185561966.23486.1.camel@x2.microgate.com>
Date:	Fri, 27 Jul 2007 13:46:06 -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:
> Maciej W. Rozycki wrote:
> >  The TTY line discipline driver could do that based on the amount of 
> > received data present in its buffer.  And it should if asked to (a brief 
> > look at drivers/char/n_tty.c reveals it does; obviously there may be a bug 
> 
> Really, where? In my look through the code I haven't found any mechanism 
> that would result in RTS being lowered based on TTY buffers filling up, 
> at least not in the 8250 case.

serial_core.c:uart_throttle()
serial_core.c:uart_unthrottle()

These are called by N_TTY in response to buffer levels.
 
--
Paul Fulghum
Microgate Systems, Ltd

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