linux-kernel - Re: Regression due to d29f3ef "tty

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Message-ID: <20120508170442.409ccbe4@bob.linux.org.uk>
Date:	Tue, 8 May 2012 17:04:42 +0100
From:	Alan Cox <alan@...ux.intel.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: Regression due to d29f3ef "tty_lock: Localise the lock"

On Tue, 08 May 2012 09:46:51 -0600
Stephen Warren <swarren@...dotorg.org> wrote:

> On 05/08/2012 03:35 AM, Alan Cox wrote:
> > On Mon, 07 May 2012 17:06:38 -0600
> > Stephen Warren <swarren@...dotorg.org> wrote:
> > 
> >> Alan,
> >>
> >> Commit d29f3ef "tty_lock: Localise the lock" appears to cause a
> >> problem for me.
> >>
> >> With this commit (as in next-20120507), I can no longer log into my
> >> system (NVIDIA Tegra device with ARM CPU) over the serial console,
> >> since the login prompt no longer appears. If I wait a few minutes,
> >> I see the following console spew:
> > 
> > Eep. If it's reproducable can you test whether adding the
> > unlock/relock in drivers/tty/pty.c does the trick ?
> > 
> > ie:
> > 	tty_unlock(tty);
> > 	tty_vhangup(tty);
> > 	tty_lock(tty);
> 
> Yes, that change in pty_close() solves the problem.

Ok Greg - I think we should go with putting that unlock back until we
understand exactly what is going on.

Alan
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