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

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Message-ID: <5b4da9ca-b641-7723-5d96-af6e5f481454@codeaurora.org>
Date:   Wed, 12 Jul 2017 17:16:05 +0530
From:   Tirupathi Reddy T <tirupath@...eaurora.org>
To:     Mark Brown <broonie@...nel.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 7/12/2017 3:32 PM, Mark Brown wrote:
> 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...
Fixed this in the new patch version(V2).
https://patchwork.kernel.org/patch/9836529/