[alsa-devel] [PATCH] ASoC: hda: increment codec device refcount when it is added to the card

[Takashi Iwai]

On Fri, 31 May 2019 17:43:53 +0200,
Ranjani Sridharan wrote:
> 
> > > Hi Takashi,
> > > 
> > > No, this actually comes at the second step in the case of SOF (ie
> > > after
> > > the machine driver is unregistered).
> > >  
> > > Actually, I just found out what's causing the issue. It is the call
> > > to
> > > snd_hda_codec_dev_free() which calls put_device() when
> > > snd_card_free()
> > > is invoked. So, adding a get_device() in snd_hda_codec_device_new()
> > > would make the refcount balanced. 
> > > 
> > > On the other hand, removing the put_device() in
> > > snd_hda_codec_dev_free() would also address the problem. I'm not
> > > sure
> > > which would be the preferred route.
> > 
> > The latter one, I'd say.
> > 
> > Actually the difference between ASoC and the legacy HDA bus is who
> > releases the device object.  For HDA legacy bus, it's supposed to be
> > done via snd_device_free() chain, while ASoC bus releases explicitly
> > as shown in my previous post.
> > 
> > So, if any, I'd paper over it like below.
> OK, makes sense. Let me send a V2 with the change. 
> 
> Also, should I also look into adding the change to make hdac_hdmi codec
> card managed as well?

Well, feel free to fix more bugs, of course ;)

BTW, I'll be on vacation from tomorrow for a week, so my reply will be
delayed.


thanks,

Takashi