linux-kernel - Re: [PATCH 1/1] regulator: core: fix a possible race in disable

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Message-ID: <20170712100250.kjbedwzdfuiq7ycs@sirena.org.uk>
Date:   Wed, 12 Jul 2017 11:02:50 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Tirupathi Reddy <tirupath@...eaurora.org>
Cc:     lgirdwood@...il.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] regulator: core: fix a possible race in disable_work
 handling

On Wed, Jul 12, 2017 at 02:59:47PM +0530, Tirupathi Reddy wrote:

> regulator_disable_deferred: 		regulator_disable_work:
>    mutex_lock(&rdev->mutex);			     .....
>    rdev->deferred_disables++;		    mutex_lock(&rdev->mutex);
>    mutex_unlock(&rdev->mutex);			     .....
>    queue_delayed_work(...)		    count =rdev->deferred_disables;
> 	.....				    rdev->deferred_disables = 0;

This shows two things simultaneously holding rdev->mutex...

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