linux-kernel - Re: [PATCH] mfd: arizona: Add comment to explain non-devm regulator

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Message-ID: <20140624101413.GF13803@lee--X1>
Date:	Tue, 24 Jun 2014 11:14:13 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	sameo@...ux.intel.com, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: arizona: Add comment to explain non-devm
 regulator_get

> To avoid someone attempting to change this regulator_get back into a
> devm_regulator_get put a comment in explaining that devres can't be used
> here as the regulator will be destroyed before devres calls
> regulator_put.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/mfd/arizona-core.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index 27936fe..b4f22e7 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -683,6 +683,12 @@ int arizona_dev_init(struct arizona *arizona)
>  		goto err_early;
>  	}
>  
> +	/**
> +	 * Don't use devres here because the only device we have to get
> +	 * against is the MFD device and DCVDD will likely be supplied by
> +	 * one of its children. Meaning that the regulator will be
> +	 * destroyed by the time devres calls regulator put.
> +	 */
>  	arizona->dcvdd = regulator_get(arizona->dev, "DCVDD");
>  	if (IS_ERR(arizona->dcvdd)) {
>  		ret = PTR_ERR(arizona->dcvdd);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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