linux-kernel - Re: [PATCH] regulator: core: Ensure we lock all regulators

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Message-ID: <1503180.zM1PdPxpk1@wuerfel>
Date:	Tue, 01 Dec 2015 17:45:17 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	Thierry Reding <treding@...dia.com>, linux-kernel@...r.kernel.org,
	Tyler Baker <tyler.baker@...aro.org>
Subject: Re: [PATCH] regulator: core: Ensure we lock all regulators

On Tuesday 01 December 2015 16:40:57 Mark Brown wrote:
> diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
> index daffff83ced2..f71db02fcb71 100644
> --- a/drivers/regulator/core.c
> +++ b/drivers/regulator/core.c
> @@ -141,7 +141,7 @@ static void regulator_lock_supply(struct regulator_dev *rdev)
>         int i;
>  
>         mutex_lock(&rdev->mutex);
> -       for (i = 1; rdev->supply; rdev = rdev->supply->rdev, i++)
> +       for (i = 1; rdev; rdev = rdev->supply->rdev, i++)
>                 mutex_lock_nested(&rdev->mutex, i);
> 

I think now we have a double lock, the initial mutex_lock() needs to
be removed again.

	Arnd
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