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Date:   Fri, 10 May 2019 21:40:11 +0300
From:   Dan Carpenter <dan.carpenter@oracle.com>
To:     Hariprasad Kelam <hariprasad.kelam@gmail.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Tim Collier <osdevtc@gmail.com>,
        Chris Opperman <eklikeroomys@gmail.com>,
        devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] staging: wlan-ng: collect return status without variable
Message-ID: <20190510184011.GE18105@kadam>
References: <20190510023900.GA4390@hari-Inspiron-1545>
 <20190510105754.GA18105@kadam>
 <20190510172308.GA3075@hari-Inspiron-1545>
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On Fri, May 10, 2019 at 10:53:08PM +0530, Hariprasad Kelam wrote:
> On Fri, May 10, 2019 at 01:57:54PM +0300, Dan Carpenter wrote:
> > On Fri, May 10, 2019 at 08:09:00AM +0530, Hariprasad Kelam wrote:
> > > diff --git a/drivers/staging/wlan-ng/cfg80211.c b/drivers/staging/wlan-ng/cfg80211.c
> > > index 8a862f7..5dad5ac 100644
> > > --- a/drivers/staging/wlan-ng/cfg80211.c
> > > +++ b/drivers/staging/wlan-ng/cfg80211.c
> > > @@ -231,17 +231,12 @@ static int prism2_set_default_key(struct wiphy *wiphy, struct net_device *dev,
> > >  {
> > >  	struct wlandevice *wlandev = dev->ml_priv;
> > >  
> > > -	int err = 0;
> > > -	int result = 0;
> > > -
> > > -	result = prism2_domibset_uint32(wlandev,
> > > -		DIDMIB_DOT11SMT_PRIVACYTABLE_WEPDEFAULTKEYID,
> > > -		key_index);
> > > -
> > > -	if (result)
> > > -		err = -EFAULT;
> > > -
> > > -	return err;
> > > +	if (prism2_domibset_uint32(wlandev,
> > > +				   DIDMIB_DOT11SMT_PRIVACYTABLE_WEPDEFAULTKEYID,
> > > +				   key_index))
> > > +		return -EFAULT;
> > > +	else
> > > +		return 0;
> > 
> > We should just preserve the error codes from prism2_domibset_uint32().
> > 
> > 	return prism2_domibset_uint32(dev->ml_priv,
> > 				DIDMIB_DOT11SMT_PRIVACYTABLE_WEPDEFAULTKEYID,
> > 				key_index);
> >
>    prism2_domibset_uint32 function can return  -ENODEV,-EPERM,-EBUSY if
>    fail  case.
> 
>    If we observe the pattern of calling this function,we can find
>    
>    "return -EFAULT on failure and 0 on success".
> 
>    Due to this we  can not collect return status directly.

Yes, I know this code is full of nonsense.

It shouldn't just always return -EFAULT, it should preserve the correct
error code.  This is only called from rdev_set_default_key() if you want
to check the caller.

regards,
dan carpenter