linux-kernel - Re: open() on /dev/tty takes 30 seconds on 2.6.36

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Message-ID: <20101101204622.7fbab5cc@lxorguk.ukuu.org.uk>
Date:	Mon, 1 Nov 2010 20:46:22 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Eli Billauer <eli@...lauer.co.il>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Greg KH <greg@...ah.com>
Subject: Re: open() on /dev/tty takes 30 seconds on 2.6.36

> I think we need to find out why it's hitting the timeout most of all,

Its a perfectly normal happening in some cases - eg when you the remote
end asserts flow control and then hangs up on you leaving it that way.

So we need to handle this by dropping locks correctly.
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