linux-kernel - Re: [PATCH] staging: iio: cdc/ad7746: fix missing return value

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Date:   Wed, 26 Oct 2016 17:48:44 +0800
From:   Eva Rachel Retuya <eraretuya@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: iio: cdc/ad7746: fix missing return value

On Tue, Oct 25, 2016 at 05:27:07PM +0100, Jonathan Cameron wrote:
> On 25/10/16 16:56, Arnd Bergmann wrote:
> > As found by "gcc -Wmaybe-uninitialized", the latest change to the
> > driver lacked an initalization for the return code in one of the
> > added cases:
> > 
> > drivers/staging/iio/cdc/ad7746.c: In function ‘ad7746_read_raw’:
> > drivers/staging/iio/cdc/ad7746.c:655:2: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
> > 
> > This sets it to IIO_VAL_INT, which I think is what we want here.
> > 
> > Fixes: 2296c0623eb7 ("staging: iio: cdc: ad7746: implement IIO_CHAN_INFO_SAMP_FREQ")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Gah, not a good bit of reviewing from me. Should have caught that one.  Thanks Arnd.
> 

It's not your fault. My apologies. v1 of this patch is OK, I just happen to 
encounter a problem and had to rework the v2 on another branch resulting
to this blunder.

I will be extra careful next time.

Eva

> Applied to the togreg branch of iio.git - initially pushed out as testing for the
> autobuilders to play with it.  Will probably be a little while before I send
> another pull to Greg (most likely the weekend)
> 
> Thanks again,
> 
> Jonathan
> > ---
> >  drivers/staging/iio/cdc/ad7746.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
> > index f41251ceeacd..a5828f9aa437 100644
> > --- a/drivers/staging/iio/cdc/ad7746.c
> > +++ b/drivers/staging/iio/cdc/ad7746.c
> > @@ -642,6 +642,7 @@ static int ad7746_read_raw(struct iio_dev *indio_dev,
> >  		case IIO_VOLTAGE:
> >  			*val = ad7746_vt_filter_rate_table[
> >  					(chip->config >> 6) & 0x3][0];
> > +			ret = IIO_VAL_INT;
> >  			break;
> >  		default:
> >  			ret = -EINVAL;
> > 
>