linux-kernel - Re: [PATCH] iio: adc: max9611: Fix temperature reading in probe

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Date:   Mon, 5 Aug 2019 18:12:44 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Stefan Agner <stefan@...er.ch>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: max9611: Fix temperature reading in probe

On Mon,  5 Aug 2019 17:55:15 +0200
Jacopo Mondi <jacopo+renesas@...ndi.org> wrote:

> The max9611 driver reads the die temperature at probe time to validate
> the communication channel. Use the actual read value to perform the test
> instead of the read function return value, which was mistakenly used so
> far.
> 
> The temperature reading test was only successful because the 0 return
> value is in the range of supported temperatures.
> 
> Fixes: 69780a3bbc0b ("iio: adc: Add Maxim max9611 ADC driver")
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>

Applied to the fixes-togreg branch of iio.git and marked for
stable.  That'll be a bit fiddly given other changes around this
so we may need to do backports.


> ---
>  drivers/iio/adc/max9611.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/max9611.c b/drivers/iio/adc/max9611.c
> index 917223d5ff5b..e9f6b1da1b94 100644
> --- a/drivers/iio/adc/max9611.c
> +++ b/drivers/iio/adc/max9611.c
> @@ -480,7 +480,7 @@ static int max9611_init(struct max9611_dev *max9611)
>  	if (ret)
>  		return ret;
> 
> -	regval = ret & MAX9611_TEMP_MASK;
> +	regval &= MAX9611_TEMP_MASK;
> 
>  	if ((regval > MAX9611_TEMP_MAX_POS &&
>  	     regval < MAX9611_TEMP_MIN_NEG) ||
> --
> 2.22.0
>