linux-kernel - Re: [PATCH v2 12/17] iio: accel: mma9553: fix gpio bitnum init value

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Date:	Sun, 26 Apr 2015 19:53:11 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Irina Tirdea <irina.tirdea@...el.com>, linux-iio@...r.kernel.org,
	Hartmut Knaack <knaack.h@....de>
CC:	linux-kernel@...r.kernel.org, Vlad Dogaru <vlad.dogaru@...el.com>
Subject: Re: [PATCH v2 12/17] iio: accel: mma9553: fix gpio bitnum init value

On 13/04/15 16:40, Irina Tirdea wrote:
> Initial value of gpio bitnum is set to -1, but
> the variable is declared as unsigned.
> 
> Use a positive invalid value for initial gpio
> bitnum.
> 
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
> Suggested-by: Hartmut Knaack <knaack.h@....de>
Applied.  I thought about adding this to the fixes-togreg
branch but got lazy and added it to the togreg one instead.

J
> ---
>  drivers/iio/accel/mma9553.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
> index 9573147..5755977 100644
> --- a/drivers/iio/accel/mma9553.c
> +++ b/drivers/iio/accel/mma9553.c
> @@ -78,6 +78,7 @@
>  
>  /* Bitnum used for GPIO configuration = bit number in high status byte */
>  #define MMA9553_STATUS_TO_BITNUM(bit)	(ffs(bit) - 9)
> +#define MMA9553_MAX_BITNUM		MMA9553_STATUS_TO_BITNUM(BIT(16))
>  
>  #define MMA9553_DEFAULT_SAMPLE_RATE	30	/* Hz */
>  
> @@ -404,8 +405,8 @@ static int mma9553_init(struct mma9553_data *data)
>  	}
>  
>  
> -	data->gpio_bitnum = -1;
>  	/* Reset GPIO */
> +	data->gpio_bitnum = MMA9553_MAX_BITNUM;
>  	ret = mma9553_conf_gpio(data);
>  	if (ret < 0)
>  		return ret;
> 

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