linux-kernel - Re: [PATCH] alsa: use subsys_initcall for sound core instead of module

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Date:	Thu, 14 Jan 2010 13:53:43 -0200
From:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	alsa-devel@...a-project.org, ibm-acpi@....eng.br,
	Jaroslav Kysela <perex@...ex.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] alsa: use subsys_initcall for sound core instead of
 module_init

On Wed, Jan 13, 2010 at 07:48:07AM +0100, Takashi Iwai wrote:
> At Tue, 12 Jan 2010 20:20:39 -0200,
> Thadeu Lima de Souza Cascardo wrote:
> > 
> > This is needed for built-in drivers which are built before the sound directory,
> > like thinkpad_acpi.
> > 
> > Otherwise, registering a card fails.
> 
> Oh well, this kind of problem hits again.
> 
> I don't remember why subsys_init() wasn't taken before...  Maybe some
> dependency between sound and V4L or so.  But, it's worth to check again.
> 

Any references to this dependency problem, so I can try to help and investigate
about it and do some tests?

> I'll apply this after some testing.
> 

Built-in thinkpad-acpi started working for me after these changes. I can't tell
you about any subsystem that stopped working, like some V4L driver.

> 
> thanks,
> 
> Takashi
> 

Regards,
Cascardo.

> > 
> > Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
> > ---
> >  sound/core/sound.c |    4 ++--
> >  sound/sound_core.c |    2 +-
> >  2 files changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/sound/core/sound.c b/sound/core/sound.c
> > index 7872a02..563d196 100644
> > --- a/sound/core/sound.c
> > +++ b/sound/core/sound.c
> > @@ -468,5 +468,5 @@ static void __exit alsa_sound_exit(void)
> >  	unregister_chrdev(major, "alsa");
> >  }
> >  
> > -module_init(alsa_sound_init)
> > -module_exit(alsa_sound_exit)
> > +subsys_initcall(alsa_sound_init);
> > +module_exit(alsa_sound_exit);
> > diff --git a/sound/sound_core.c b/sound/sound_core.c
> > index dbca7c9..7c2d677 100644
> > --- a/sound/sound_core.c
> > +++ b/sound/sound_core.c
> > @@ -61,7 +61,7 @@ static void __exit cleanup_soundcore(void)
> >  	class_destroy(sound_class);
> >  }
> >  
> > -module_init(init_soundcore);
> > +subsys_initcall(init_soundcore);
> >  module_exit(cleanup_soundcore);
> >  
> >  
> > -- 
> > 1.6.6
> > 

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