linux-kernel - Re: [PATCH 1/1] ice1712: check if snd card loaded, if not do not proceed

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Message-ID: <s5hha2kjoyq.wl%tiwai@suse.de>
Date:	Mon, 14 Jul 2014 10:59:09 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Konstantinos Tsimpoukas <kostaslinuxxx@...il.com>
Cc:	alsa-devel@...a-project.org, Jaroslav Kysela <perex@...ex.cz>,
	linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ice1712: check if snd card loaded, if not do not proceed

At Fri, 11 Jul 2014 12:50:10 -0500,
Konstantinos Tsimpoukas wrote:
> 
> Then i suppose the same applies for hda snd remove (in hda_intel.c),
> as same struct is used there as well.

No, hda_intel.c is an exception.  Its probe continues to a workqueue,
and the probe failure might happen asynchronously, thus pci drvdata
can be actually NULL at remove callback.


Takashi

> 
> Regards,
> Kostas
> 
> 
> 2014-07-11 5:06 GMT-05:00 Takashi Iwai <tiwai@...e.de>:
> 
> > At Thu, 10 Jul 2014 23:19:37 -0500,
> > Konstantinos Tsimpoukas wrote:
> > >
> > > Just adding a simple if statement, which
> > > verifies if actually card is loaded, if not
> > > does not continue with the execution
> > > of the snd_card_free.
> >
> > It's already referenced by ice, so a NULL check must be peformed at
> > first.  But, basically card is always non-NULL.  The remove callback
> > is called only for objects that was properly bound with probe
> > callback.  snd_ice1712_probe() always sets the card pointer when it
> > succeeds.
> >
> >
> > thanks,
> >
> > Takashi
> >
> >
> > > Signed-off-by: Konstantinos Tsimpoukas <kostaslinuxxx@...il.com>
> > > ---
> > >  sound/pci/ice1712/ice1712.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
> > > index d9b9e45..431096b 100644
> > > --- a/sound/pci/ice1712/ice1712.c
> > > +++ b/sound/pci/ice1712/ice1712.c
> > > @@ -2819,7 +2819,8 @@ static void snd_ice1712_remove(struct pci_dev *pci)
> > >
> > >       if (ice->card_info && ice->card_info->chip_exit)
> > >               ice->card_info->chip_exit(ice);
> > > -     snd_card_free(card);
> > > +     if (card)
> > > +             snd_card_free(card);
> > >  }
> > >
> > >  #ifdef CONFIG_PM_SLEEP
> > > --
> > > 1.9.1
> > >
> >
> [2  <text/html; UTF-8 (quoted-printable)>]
> 
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