linux-kernel - Re: [PATCH 13/14] regulator: max8925: fix not add device if missing init data

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Message-ID: <20110421104204.GB11788@opensource.wolfsonmicro.com>
Date:	Thu, 21 Apr 2011 11:42:04 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Haojian Zhuang <haojian.zhuang@...vell.com>
Cc:	sameo@...ux.intel.com, haojian.zhuang@...il.com,
	linux-kernel@...r.kernel.org, lrg@...mlogic.co.uk
Subject: Re: [PATCH 13/14] regulator: max8925: fix not add device if
 missing init data

On Wed, Apr 20, 2011 at 07:55:39PM +0800, Haojian Zhuang wrote:
> If regulator[0] is missed in init data, all regulators of max8925 won't
> be initialized.

With a changelog like this I'd expect a small change to an error check
in the startup code or something but this is a very big change to the
driver initialisation.

> +static struct regulator_init_data regulator_pdata[ARRAY_SIZE(regulator_devs)];

That looks really suspicious, what happens if there's two of these
devices in the system?

> +		memcpy(&regulator_pdata[i], &pdata->regulator[i],
> +			sizeof(struct regulator_init_data));
> +		regulator_devs[i].platform_data = &regulator_pdata[i];
> +		regulator_devs[i].pdata_size = sizeof(regulator_pdata[i]);
> +		regulator_devs[i].num_resources = 1;
> +		regulator_devs[i].resources = &regulator_resources[seq];
> +
> +		ret = mfd_add_devices(chip->dev, 0, &regulator_devs[i], 1,
> +				      &regulator_resources[seq], 0);
> +		if (ret < 0) {
> +			dev_err(chip->dev, "Failed to add regulator subdev\n");
> +			goto out;

It's really unclear why the array is needed at all if you're registering
the devices one at a time.

> -	if (pdata && pdata->regulator[0]) {
> -		ret = mfd_add_devices(chip->dev, 0, &regulator_devs[0],
> -				      ARRAY_SIZE(regulator_devs),
> -				      &regulator_resources[0], 0);
> -		if (ret < 0) {
> -			dev_err(chip->dev, "Failed to add regulator subdev\n");
> -			goto out_dev;
> -		}

Surely the only change that's needed here is to remove the check to see
if pdata->regulator[0] is non-null?
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