linux-kernel - Re: [PATCH] iio: 104-quad-8: Fix off-by-one errors when addressing IOR

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Date:   Sat, 3 Dec 2016 10:04:07 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     William Breathitt Gray <vilhelm.gray@...il.com>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: 104-quad-8: Fix off-by-one errors when addressing
 IOR

On 28/11/16 21:55, William Breathitt Gray wrote:
> The Input/Output Control register (IOR) is offset by 1 from the
> respective channel data register. This patch fixes off-by-one errors
> when attempting to write to a channel IOR where the base address was not
> properly offset.
> 
> Fixes: 28e5d3bb0325 ("iio: 104-quad-8: Add IIO support for the ACCES 104-QUAD-8")
> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
Applied to the fixes-togreg-post-rc1 branch and marked for stable.

Will push out when I next have a net connection and remember!

Jonathan
> ---
>  drivers/iio/counter/104-quad-8.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/counter/104-quad-8.c b/drivers/iio/counter/104-quad-8.c
> index 2d2ee35..412d283 100644
> --- a/drivers/iio/counter/104-quad-8.c
> +++ b/drivers/iio/counter/104-quad-8.c
> @@ -153,7 +153,7 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
>  		ior_cfg = val | priv->preset_enable[chan->channel] << 1;
>  
>  		/* Load I/O control configuration */
> -		outb(0x40 | ior_cfg, base_offset);
> +		outb(0x40 | ior_cfg, base_offset + 1);
>  
>  		return 0;
>  	case IIO_CHAN_INFO_SCALE:
> @@ -241,7 +241,7 @@ static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev,
>  	size_t len)
>  {
>  	struct quad8_iio *const priv = iio_priv(indio_dev);
> -	const int base_offset = priv->base + 2 * chan->channel;
> +	const int base_offset = priv->base + 2 * chan->channel + 1;
>  	bool preset_enable;
>  	int ret;
>  	unsigned int ior_cfg;
>