linux-kernel - Re: [PATCH 1/3] regulator/max1586: support increased V3 voltage range

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Message-ID: <87skip2gxu.fsf@free.fr>
Date:	Thu, 28 May 2009 20:58:05 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Philipp Zabel <philipp.zabel@...il.com>
Cc:	linux-kernel@...r.kernel.org, Liam Girdwood <lrg@...mlogic.co.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Eric Miao <eric.miao@...vell.com>
Subject: Re: [PATCH 1/3] regulator/max1586: support increased V3 voltage range

Philipp Zabel <philipp.zabel@...il.com> writes:

<snip>
> @@ -164,14 +184,25 @@ static int max1586_pmic_probe(struct i2c_client *client,
>  {
>  	struct regulator_dev **rdev;
>  	struct max1586_platform_data *pdata = client->dev.platform_data;
> -	int i, id, ret = 0;
> +	struct max1586_data *max1586;
> +	int i, id, ret = -ENOMEM;
> +
> +	max1586 = kzalloc(sizeof(struct max1586_data) +
> +			sizeof(struct regulator_dev *) * (MAX1586_V6 + 1),
> +			GFP_KERNEL);
> +	if (!max1586)
> +		goto out;
>  
> -	rdev = kzalloc(sizeof(struct regulator_dev *) * (MAX1586_V6 + 1),
> -		       GFP_KERNEL);
> -	if (!rdev)
> -		return -ENOMEM;
> +	max1586->client = client;
>  
> -	ret = -EINVAL;
> +	if (!pdata->v3_gain) {
> +		ret = -EINVAL;
> +		goto out_unmap;
> +	}

> +	max1586->min_uV = MAX1586_V3_MIN_UV * pdata->v3_gain / 1000000;
> +	max1586->max_uV = MAX1586_V3_MAX_UV * pdata->v3_gain / 1000000;
My last comment : you'll overflow an integer capacity here, and will get
min_uV=max_uV=0.

Please replace by :
       max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * (pdata->v3_gain / 1000);
       max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * (pdata->v3_gain / 1000);

And then add my :
Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>

Cheers.

--
Robert

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