linux-kernel - Re: [PATCH] regulator: core: Move regulator release to avoid deadlock

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Message-ID: <5090FE97.7070303@nvidia.com>
Date:	Wed, 31 Oct 2012 16:03:59 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	"lrg@...com" <lrg@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...nsource.wolfsonmicro.com" 
	<patches@...nsource.wolfsonmicro.com>
Subject: Re: [PATCH] regulator: core: Move regulator release to avoid deadlock

On Monday 29 October 2012 09:44 PM, Mark Brown wrote:
> * PGP Signed by an unknown key
>
> On Mon, Oct 29, 2012 at 09:33:33AM +0000, Charles Keepax wrote:
>> regulator_put function was called whilst holding the
>> regulator_list_mutex, which is also locked from regulator_put. This
>> causes deadlock when failing to register a regulator.
> Applied, thanks.

This patch create the crash in following case:
- If there is of rail supply and supply does not found. In this case it 
goes to scrub and rdev->supply at this point shows NULL but when call 
the function device_unregister(&rdev->dev), the rdev->supply becomes 
random pointer.

What happen if we do the device_unregister() outside the mutex lock?
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