linux-kernel - Re: [PATCH v2 03/14] staging: iio: ad7746: Fix bound checkings

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Message-ID: <20180421154013.3e9c3c3e@archlinux>
Date:   Sat, 21 Apr 2018 15:40:13 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     Hernán Gonzalez <hernan@...guardiasur.com.ar>,
        <knaack.h@....de>, <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        <gregkh@...uxfoundation.org>, <Michael.Hennerich@...log.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/14] staging: iio: ad7746: Fix bound checkings

On Wed, 18 Apr 2018 10:39:48 +0100
Jonathan Cameron <Jonathan.Cameron@...wei.com> wrote:

> On Mon, 16 Apr 2018 11:47:05 -0300
> Hernán Gonzalez <hernan@...guardiasur.com.ar> wrote:
> 
> > On Sun, Apr 15, 2018 at 12:05 PM, Jonathan Cameron <jic23@...nel.org> wrote:  
> > > On Fri, 13 Apr 2018 13:36:40 -0300
> > > Hernán Gonzalez <hernan@...guardiasur.com.ar> wrote:
> > >    
> > >> Also remove unnecessary parenthesis    
> > > I am probably missing something.  I'm not sure what you mean
> > > by fix bound checking?   There are superfluous brackets, but
> > > I don't see any functional change to indicate there was anything
> > > wrong with the original checks.
> > >    
> > 
> > Maybe I'm wrong but | is a bitwise operator while || is a logical one.
> > There are no functional changes as you said but, from K&R, "One must
> > distinguish the bitwise operators & and | from the logical operators
> > && and II, which imply left-to-right evaluation of a truth value. For
> > example, if x is 1 and y is 2, then x & y is zero while x && y is one"
> > so it'd be slightly faster if the first condition is true, and it
> > would be the "correct" operator to use in this case, even though it
> > doesn't affect the result.  
> Got you, I missed the operator change entirely. Doh.
> 
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> Jonathan
> 
> >   
> > >>
> > >> Signed-off-by: Hernán Gonzalez <hernan@...guardiasur.com.ar>
> > >> ---
> > >>  drivers/staging/iio/cdc/ad7746.c | 4 ++--
> > >>  1 file changed, 2 insertions(+), 2 deletions(-)
> > >>
> > >> diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
> > >> index 516aa93..d793785 100644
> > >> --- a/drivers/staging/iio/cdc/ad7746.c
> > >> +++ b/drivers/staging/iio/cdc/ad7746.c
> > >> @@ -458,7 +458,7 @@ static int ad7746_write_raw(struct iio_dev *indio_dev,
> > >>               ret = 0;
> > >>               break;
> > >>       case IIO_CHAN_INFO_CALIBBIAS:
> > >> -             if ((val < 0) | (val > 0xFFFF)) {
> > >> +             if (val < 0 || val > 0xFFFF) {
> > >>                       ret = -EINVAL;
> > >>                       goto out;
> > >>               }
> > >> @@ -470,7 +470,7 @@ static int ad7746_write_raw(struct iio_dev *indio_dev,
> > >>               ret = 0;
> > >>               break;
> > >>       case IIO_CHAN_INFO_OFFSET:
> > >> -             if ((val < 0) | (val > 43008000)) { /* 21pF */
> > >> +             if (val < 0 || val > 43008000) { /* 21pF */
> > >>                       ret = -EINVAL;
> > >>                       goto out;
> > >>               }    
> > >    
> > --
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> 
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