linux-kernel - Re: [PATCH v2] Staging: dgnc: release the lock before testing for nullity

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Message-ID: <550980E5.8080001@gmail.com>
Date:	Wed, 18 Mar 2015 14:43:01 +0100
From:	Quentin Lambert <lambert.quentin@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	Lidza Louina <lidza.louina@...il.com>, devel@...verdev.osuosl.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	driverdev-devel@...uxdriverproject.org,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Staging: dgnc: release the lock before testing for
 nullity



On 18/03/2015 14:36, Dan Carpenter wrote:
> This changelog still doesn't make sense so I took a look at the code.
>
> tty_ldisc_deref() is an unlock function.  So this is a lock ordering
> bug.  What makes you think the original ordering was correct?  Who
> reported this bug?  What are the effects of this bug?
I was the one who introduced the ordering change in the first place.
I am just trying to fix it because although nobody complained I am not
sure of the impact and restoring the previous control flow seems to be the
right thing to do.
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