linux-kernel - Re: [PATCH 04/12] iio: adc: max9611: Fix misuse of GENMASK macro

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Message-ID: <b3744e64b22de98bfe8885f76811d4fc7e41b8eb.camel@perches.com>
Date:   Sun, 14 Jul 2019 05:19:32 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH 04/12] iio: adc: max9611: Fix misuse of GENMASK macro

On Sun, 2019-07-14 at 12:54 +0100, Jonathan Cameron wrote:
> On Tue,  9 Jul 2019 22:04:17 -0700
> Joe Perches <joe@...ches.com> wrote:
> 
> > Arguments are supposed to be ordered high then low.
> > 
> > Signed-off-by: Joe Perches <joe@...ches.com>
> 
> Applied to the fixes-togreg branch of iio.git and marked for
> stable etc.

This mask is used in an init function called from a probe.

I don't have this hardware but it looks as if it could
never have worked so I doubt the driver and the hardware
have ever been tested.

Does anyone have this device in actual use?


	regval = ret & MAX9611_TEMP_MASK;

	if ((regval > MAX9611_TEMP_MAX_POS &&
	     regval < MAX9611_TEMP_MIN_NEG) ||
	     regval > MAX9611_TEMP_MAX_NEG) {
		dev_err(max9611->dev,
			"Invalid value received from ADC 0x%4x: aborting\n",
			regval);
		return -EIO;
	}


> Thanks,
> 
> Jonathan
> 
> > ---
> >  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..0e3c6529fc4c 100644
> > --- a/drivers/iio/adc/max9611.c
> > +++ b/drivers/iio/adc/max9611.c
> > @@ -83,7 +83,7 @@
> >  #define MAX9611_TEMP_MAX_POS		0x7f80
> >  #define MAX9611_TEMP_MAX_NEG		0xff80
> >  #define MAX9611_TEMP_MIN_NEG		0xd980
> > -#define MAX9611_TEMP_MASK		GENMASK(7, 15)
> > +#define MAX9611_TEMP_MASK		GENMASK(15, 7)
> >  #define MAX9611_TEMP_SHIFT		0x07
> >  #define MAX9611_TEMP_RAW(_r)		((_r) >> MAX9611_TEMP_SHIFT)
> >  #define MAX9611_TEMP_SCALE_NUM		1000000