linux-kernel - Re: [PATCH v2 2/3] ALSA: ice1712: consider error value

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Date:	Fri, 14 Nov 2014 12:03:58 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] ALSA: ice1712: consider error value

At Fri, 14 Nov 2014 16:29:15 +0530,
Sudip Mukherjee wrote:
> 
> On Fri, Nov 14, 2014 at 11:43:31AM +0100, Takashi Iwai wrote:
> > At Fri, 14 Nov 2014 16:09:06 +0530,
> > Sudip Mukherjee wrote:
> > > 
> > > earlier we were ignoring the return value of snd_ak4114_create and
> > > always returning 0.
> > > now we are returning the actual status. revo_init is calling this
> > > function, and revo_init is checking the return value.
> > 
> > It's not enough only to change there.  The problem is that
> > spec->ak4114 is dereferenced after snd_ak4114_create(), and this might
> > be NULL.  So it should return the error before that point.
> > 
> 
> oops .. i should have looked carefully.
> 
> one more thought:
> shouldn't we also do a kfree(spec) on error ?

Not necessary.  It's freed in the card's destructor.


Takashi

> 
> thanks
> sudip
> 
> > 
> > Takashi
> > 
> > 
> > > Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> > > ---
> > >  sound/pci/ice1712/revo.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/sound/pci/ice1712/revo.c b/sound/pci/ice1712/revo.c
> > > index 1112ec1..2835196 100644
> > > --- a/sound/pci/ice1712/revo.c
> > > +++ b/sound/pci/ice1712/revo.c
> > > @@ -498,7 +498,7 @@ static int ap192_ak4114_init(struct snd_ice1712 *ice)
> > >  	 * No reason to stop capture stream due to incorrect checks */
> > >  	spec->ak4114->check_flags = AK4114_CHECK_NO_RATE;
> > >  
> > > -	return 0; /* error ignored; it's no fatal error */
> > > +	return err;
> > >  }
> > >  
> > >  static int revo_init(struct snd_ice1712 *ice)
> > > -- 
> > > 1.8.1.2
> > > 
> 
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