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

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Message-ID: <20120508160930.GB20433@kroah.com>
Date:	Tue, 8 May 2012 09:09:30 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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, May 08, 2012 at 05:04:42PM +0100, Alan Cox wrote:
> 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.

Ok, care to send a patch that does this so I get it correct, and we get
a reported-by from Stephen?

thanks,

greg k-h
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