linux-kernel - Re: [Bug #14388] keyboard under X with 2.6.31

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Date:	Wed, 14 Oct 2009 08:07:36 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Paul Fulghum <paulkf@...rogate.com>,
	Boyan <btanastasov@...oo.co.uk>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Ed Tomlinson <edt@....ca>,
	"OGAWA Hirofumi \"" <hirofumi@...l.parknet.co.jp>
Subject: Re: [Bug #14388] keyboard under X with 2.6.31



On Wed, 14 Oct 2009, Alan Cox wrote:
>
> Stop a moment. The code wasn't designed to permit two paralle calls of
> flush_to_ldisc to the same tty. That was always forbidden when that code
> was designed.

No, the code was clearly _designed_ for it - that's the whole and only 
point of the

	tty->buf.head = NULL;

line.

But it's certainly true that it just never happened before. At least for 
the !low_latency case, I'm not so sure about the low_latency=1 case, but I 
haven't checked either - it would depend on any higher-level 
serialization.

		Linus
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