[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAFQmdRYTgQOb53kQOvk1jubZbvaOrfjVCq4aG1H0ceshw2vVPA@mail.gmail.com>
Date: Tue, 22 Nov 2011 23:28:31 -0800
From: Havard Skinnemoen <hskinnemoen@...gle.com>
To: Dave Jones <davej@...hat.com>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...e.de>,
Havard Skinnemoen <hskinnemoen@...gle.com>
Subject: Re: tty related lockdep trace during bootup on 3.2-rc2
On Tue, Nov 22, 2011 at 7:38 PM, Dave Jones <davej@...hat.com> wrote:
> From Linus' current tree...
>
> related to 5dc2470c602da8851907ec18942cd876c3b4ecc1 maybe ?
Yes, probably. I did have a bad feeling about the locking, but it
seemed to behave well during testing. Wonder why I didn't see this.
So what's happening is that tty_open() holds big_tty_mutex while
calling acm_tty_open which takes open_lock, and acm_tty_close holds
open_lock while calling tty_port_close_start which takes
big_tty_mutex?
Not sure how to solve this. Not taking the lock before calling
tty_port_close_start means the tty_port may get freed before it
returns.
Havard
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists