linux-kernel - Re: [PATCH] tty: tty_mutex: fix lockdep warning in tty_lock

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Date:	Sat, 26 May 2012 18:39:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] tty: tty_mutex: fix lockdep warning in
 tty_lock_pair(v3)

On Sat, 2012-05-26 at 17:23 +0800, Ming Lei wrote:
> 
> You mean that the below is good usage of lock?
> 
>         LOCK A
>         LOCK B
> 
>         UNLOCK A
>         UNLOCK B 

Yep, nothing wrong with that. Its lock order that matters, unlock very
much not so.

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