linux-kernel - Re: [PATCH v2] regulator: core: fix race condition in regulator

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Message-ID: <20150108181556.GR2634@sirena.org.uk>
Date:	Thu, 8 Jan 2015 18:15:56 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Ashay Jaiswal <ashayj@...eaurora.org>
Cc:	Liam Girdwood <lgirdwood@...il.com>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	Anirudh Ghayal <aghayal@...eaurora.org>,
	David Collins <collinsd@...eaurora.org>
Subject: Re: [PATCH v2] regulator: core: fix race condition in regulator_put()

On Thu, Jan 08, 2015 at 06:54:25PM +0530, Ashay Jaiswal wrote:
> The regulator framework maintains a list of consumer regulators
> for a regulator device and protects it from concurrent access using
> the regulator device's mutex lock.

Applied, thanks but...

> +	mutex_lock(&rdev->mutex);
>  	kfree(regulator->supply_name);
>  	list_del(&regulator->list);
>  	kfree(regulator);
> 
>  	rdev->open_count--;
>  	rdev->exclusive = 0;
> +	mutex_unlock(&rdev->mutex);

I'll do a followup which moves the frees out of the locked region
(reordering things a bit) - they're the main bit I was worried about
with time, they should be fast since they're just frees but it's easy
enough to avoid having to think about it.

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