linux-kernel - Re: [PATCH] rtc-v3020: add ability to access v3020 chip with GPIOs

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Date:	Tue, 03 Mar 2009 08:16:14 +0200
From:	Mike Rapoport <mike@...pulab.co.il>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	alessandro.zummo@...ertech.it, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org, raph@...com,
	David Brownell <david-b@...bell.net>
Subject: Re: [PATCH] rtc-v3020: add ability to access v3020 chip with GPIOs



Andrew Morton wrote:
> On Mon,  2 Mar 2009 13:40:57 +0200
> Mike Rapoport <mike@...pulab.co.il> wrote:
> 
>> +static int v3020_gpio_map(struct v3020 *chip, struct platform_device *pdev,
>> +			  struct v3020_platform_data *pdata)
>> +{
>> +	int i, err;
>> +
>> +	v3020_gpio[V3020_CS].gpio = pdata->gpio_cs;
>> +	v3020_gpio[V3020_WR].gpio = pdata->gpio_wr;
>> +	v3020_gpio[V3020_RD].gpio = pdata->gpio_rd;
>> +	v3020_gpio[V3020_IO].gpio = pdata->gpio_io;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(v3020_gpio); i++) {
>> +		err = gpio_request(v3020_gpio[i].gpio, v3020_gpio[i].name);
>> +		if (err)
>> +			goto err_request;
>> +
>> +		gpio_direction_output(v3020_gpio[i].gpio, 1);
>> +	}
>> +
>> +	chip->gpio = v3020_gpio;
>> +
>> +	return 0;
>> +
>> +err_request:
>> +	for (; i >= 0; i--)
>> +		gpio_free(v3020_gpio[i].gpio);
>> +
>> +	return err;
>> +}
> 
> It needs this fix, I think?

Indeed. Thanks.

> 
> fix off-by-one in error path
> 
> --- a/drivers/rtc/rtc-v3020.c~rtc-v3020-add-ability-to-access-v3020-chip-with-gpios-fix
> +++ a/drivers/rtc/rtc-v3020.c
> @@ -136,7 +136,7 @@ static int v3020_gpio_map(struct v3020 *
>  	return 0;
>  
>  err_request:
> -	for (; i >= 0; i--)
> +	while (--i >= 0)
>  		gpio_free(v3020_gpio[i].gpio);
>  
>  	return err;
> 
> --
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> 

-- 
Sincerely yours,
Mike.

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