linux-kernel - Re: possible locking bug in tty

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Message-Id: <201005042226.26030.arnd@arndb.de>
Date:	Tue, 4 May 2010 22:26:25 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>
Subject: Re: possible locking bug in tty_open

On Tuesday 04 May 2010 21:42:36 Alan Cox wrote:
> On Sun, 2 May 2010 22:47:33 +0200
> Arnd Bergmann <arnd@...db.de> wrote:

> > After the "retry_open:" label, we first get the tty_mutex
> > and then the BKL. However a the end of tty_open, we jump
> > back to retry_open with the BKL still held. If we run into
> > this case, the tty_open function will be left with the BKL
> > still held.

> I think all we need is probably this
> 
> tty: Fix unbalanced BKL handling in error path
>     
> Arnd noted:
>     
> After the "retry_open:" label, we first get the tty_mutex
> and then the BKL. However a the end of tty_open, we jump
> back to retry_open with the BKL still held. If we run into
> this case, the tty_open function will be left with the BKL
> still held.

Yes, looks good.

>     
> Signed-off-by: Alan Cox <alan@...ux.intel.com>

Acked-by: Arnd Bergmann <arnd@...db.de>
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