linux-kernel - Re: [PATCH] tty: Correct tty buffer flushing.

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Date:	Thu, 29 Nov 2012 20:14:14 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	Ilya Zykov <ilya@...x.ru>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Xiaobing Tu <xiaobing.tu@...el.com>,
	Jiri Slaby <jslaby@...e.cz>, Alek Du <alek.du@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH] tty: Correct tty buffer flushing.

On Thu, 2012-11-29 at 21:28 +0000, Alan Cox wrote:
> > Sorry, In you reply not all patch.
> > Main idea here -  we never flash last (struct tty_buffer) in the
> > active buffer. Only data for ldisc. (tty->buf.head->read =
> > tty->buf.head->commit). At that moment driver can collect(write) data
> > in buffer without conflict.
> 
> Ah.. now I understand. Yes that makes sense.  I will think about that
> carefully. This is why a good explanation with a patch is important.

FWIW, I've been running this on -next. The logic seems sound to me --
fundamentally, this technique is what flush_to_ldisc() does.

Regards,
Peter Hurley


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