From: Jiri Slaby <jslaby@suse.cz>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
Jiri Slaby <jirislaby@gmail.com>
Subject: Re: [PATCH 3/3] tty_lock: Localise the lock
Date: Mon, 07 May 2012 23:04:18 +0200 [thread overview]
Message-ID: <4FA838D2.9000908@suse.cz> (raw)
In-Reply-To: <CA+1xoqez0PaX2KBHHN-etztwbFoU1cKx3NwMXX+PO4SguA3bRg@mail.gmail.com>
On 05/07/2012 07:00 PM, Sasha Levin wrote:
>> So whatever your trace is showing, that's not the bug. Something more
>> complicated would appear to be afoot.
>
> Oddly enough, tty != tty->link, but the lockdep warning triggers.
>
> Any idea why it might happen?
I think so, both locks are the same lockdep class. So lockdep thinks it
is the same lock. However this is a false positive. I guess we need
mutex_lock_nested...
regards,
--
js
suse labs
next prev parent reply other threads:[~2012-05-07 21:04 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-03 21:21 [PATCH 1/3] tty_lock: undo the old tty_lock use on the ctty Alan Cox
2012-05-03 21:22 ` [PATCH 2/3] pty: Lock the devpts bits privately Alan Cox
2012-05-08 18:18 ` H. Peter Anvin
2012-05-08 20:43 ` Alan Cox
2012-05-08 20:41 ` H. Peter Anvin
2012-05-03 21:24 ` [PATCH 3/3] tty_lock: Localise the lock Alan Cox
2012-05-04 20:48 ` Arnd Bergmann
2012-05-04 23:54 ` Greg KH
2012-05-04 23:55 ` Greg KH
2012-05-07 16:03 ` Sasha Levin
2012-05-07 16:11 ` Alan Cox
2012-05-07 16:30 ` Sasha Levin
2012-05-07 16:42 ` Alan Cox
2012-05-07 17:00 ` Sasha Levin
2012-05-07 21:04 ` Jiri Slaby [this message]
2012-05-08 18:12 ` Sasha Levin
2012-05-11 10:40 ` Sasha Levin
2012-05-11 14:52 ` Greg KH
2012-05-11 15:09 ` Sasha Levin
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