linux-kernel - Re: [Bug #14015] pty regressed again, breaking expect and gcc's testsuite

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Message-ID: <20090905225642.79251527@lxorguk.ukuu.org.uk>
Date:	Sat, 5 Sep 2009 22:56:42 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mikael Pettersson <mikpe@...uu.se>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Alan Cox <alan@...ux.intel.com>, Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Bug #14015] pty regressed again, breaking expect and gcc's
 testsuite

> So, it will use the 64kb limit at least few paths, and I'm not sure
> though, non-n_tty path (e.g. ppp) doesn't use tty_write_room() check
> always. It may not be consistent if we removed pty_space() in pty_write().

The correct behaviour for most network protocols to overflow is to drop
packets so the behaviour of not checking was intentional.

Alan
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