Follow Up: "Why my linux OS has only 8 sound cards ? How can I modify it ?"

Follow Up: "Why my linux OS has only 8 sound cards ? How can I modify it ?"

[Maciej Paszta]

Hi!

This issue has already been brought up by Chris Shen on Nov 8 2011. 
Quick reminder: I have  10 sound cards which need to have oss emulation 
enabled. However, I only see 8 devices (dsp-dsp7). Takashi suggested a 
patch to workaround this problem:
http://mailman.alsa-project.org/pipermail/alsa-devel/2011-November/045764.html
I've applied it to kernel 3.0.0 and the only result I get is message 
appearing in kernel logs: "unable to register OSS PCM device 8:0". I've 
done some debugging and the registration fails on these lines 
(sound/core/sound_oss.c):
register1 = register_sound_special_device(f_ops, minor, carddev);
if (register1 != minor)
{
     snd_printk(KERN_ERR "OSS: 4, register1: %i, minor %i\n", register1, 
minor);
     goto __end;
}
the debug lines seem to be constant about the value of "register1" == 
-2. I would really appreciate any help with this problem and I will be 
glad to test any patches, that may solve the issue.

-- 
Maciej Paszta
Mobile Systems Research Labs, Poznan University of Technology

Re: Follow Up: "Why my linux OS has only 8 sound cards ? How can I modify it ?"

[Clemens Ladisch]

Maciej Paszta wrote:
> Quick reminder: I have  10 sound cards which need to have oss emulation
> enabled. However, I only see 8 devices (dsp-dsp7). Takashi suggested a
> patch to workaround this problem:
> http://mailman.alsa-project.org/pipermail/alsa-devel/2011-November/045764.html
> I've applied it to kernel 3.0.0 and the only result I get is message
> appearing in kernel logs: "unable to register OSS PCM device 8:0". I've
> done some debugging and the registration fails on these lines
> (sound/core/sound_oss.c):
> register1 = register_sound_special_device(f_ops, minor, carddev);

Try replacing 128 with 256 in register_sound_special_device() in
sound/sound_core.c.


Regards,
Clemens

Re: Follow Up: "Why my linux OS has only 8 sound cards ? How can I modify it ?"

[Takashi Iwai]

At Tue, 08 May 2012 15:02:33 +0200,
Clemens Ladisch wrote:
> 
> Maciej Paszta wrote:
> > Quick reminder: I have  10 sound cards which need to have oss emulation
> > enabled. However, I only see 8 devices (dsp-dsp7). Takashi suggested a
> > patch to workaround this problem:
> > http://mailman.alsa-project.org/pipermail/alsa-devel/2011-November/045764.html
> > I've applied it to kernel 3.0.0 and the only result I get is message
> > appearing in kernel logs: "unable to register OSS PCM device 8:0". I've
> > done some debugging and the registration fails on these lines
> > (sound/core/sound_oss.c):
> > register1 = register_sound_special_device(f_ops, minor, carddev);
> 
> Try replacing 128 with 256 in register_sound_special_device() in
> sound/sound_core.c.

Actually it should be 256, instead of 256 + unit, like the patch below.


Takashi

---
diff --git a/sound/sound_core.c b/sound/sound_core.c
index c6e81fb..fb9255c 100644
--- a/sound/sound_core.c
+++ b/sound/sound_core.c
@@ -361,7 +361,7 @@ int register_sound_special_device(const struct file_operations *fops, int unit,
 				  struct device *dev)
 {
 	const int chain = unit % SOUND_STEP;
-	int max_unit = 128 + chain;
+	int max_unit = 256;
 	const char *name;
 	char _name[16];
 

Re: Follow Up: "Why my linux OS has only 8 sound cards ? How can I modify it ?"

[Maciej Paszta]

Thanks!

Changing to 256 made all devices appear!

On 2012-05-08 15:32, Takashi Iwai wrote:
> At Tue, 08 May 2012 15:02:33 +0200,
> Clemens Ladisch wrote:
>> Maciej Paszta wrote:
>>> Quick reminder: I have  10 sound cards which need to have oss emulation
>>> enabled. However, I only see 8 devices (dsp-dsp7). Takashi suggested a
>>> patch to workaround this problem:
>>> http://mailman.alsa-project.org/pipermail/alsa-devel/2011-November/045764.html
>>> I've applied it to kernel 3.0.0 and the only result I get is message
>>> appearing in kernel logs: "unable to register OSS PCM device 8:0". I've
>>> done some debugging and the registration fails on these lines
>>> (sound/core/sound_oss.c):
>>> register1 = register_sound_special_device(f_ops, minor, carddev);
>> Try replacing 128 with 256 in register_sound_special_device() in
>> sound/sound_core.c.
> Actually it should be 256, instead of 256 + unit, like the patch below.
>
>
> Takashi
>
> ---
> diff --git a/sound/sound_core.c b/sound/sound_core.c
> index c6e81fb..fb9255c 100644
> --- a/sound/sound_core.c
> +++ b/sound/sound_core.c
> @@ -361,7 +361,7 @@ int register_sound_special_device(const struct file_operations *fops, int unit,
>   				  struct device *dev)
>   {
>   	const int chain = unit % SOUND_STEP;
> -	int max_unit = 128 + chain;
> +	int max_unit = 256;
>   	const char *name;
>   	char _name[16];
>
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel


-- 
Maciej Paszta
Mobile Systems Research Labs, Poznan University of Technology

Re: Follow Up: "Why my linux OS has only 8 sound cards ? How can I modify it ?"

[Takashi Iwai]

At Tue, 08 May 2012 16:15:24 +0200,
Maciej Paszta wrote:
> 
> Thanks!
> 
> Changing to 256 made all devices appear!

OK, I'll queue the fixes for 3.5 kernel.


thanks,

Takashi

> On 2012-05-08 15:32, Takashi Iwai wrote:
> > At Tue, 08 May 2012 15:02:33 +0200,
> > Clemens Ladisch wrote:
> >> Maciej Paszta wrote:
> >>> Quick reminder: I have  10 sound cards which need to have oss emulation
> >>> enabled. However, I only see 8 devices (dsp-dsp7). Takashi suggested a
> >>> patch to workaround this problem:
> >>> http://mailman.alsa-project.org/pipermail/alsa-devel/2011-November/045764.html
> >>> I've applied it to kernel 3.0.0 and the only result I get is message
> >>> appearing in kernel logs: "unable to register OSS PCM device 8:0". I've
> >>> done some debugging and the registration fails on these lines
> >>> (sound/core/sound_oss.c):
> >>> register1 = register_sound_special_device(f_ops, minor, carddev);
> >> Try replacing 128 with 256 in register_sound_special_device() in
> >> sound/sound_core.c.
> > Actually it should be 256, instead of 256 + unit, like the patch below.
> >
> >
> > Takashi
> >
> > ---
> > diff --git a/sound/sound_core.c b/sound/sound_core.c
> > index c6e81fb..fb9255c 100644
> > --- a/sound/sound_core.c
> > +++ b/sound/sound_core.c
> > @@ -361,7 +361,7 @@ int register_sound_special_device(const struct file_operations *fops, int unit,
> >   				  struct device *dev)
> >   {
> >   	const int chain = unit % SOUND_STEP;
> > -	int max_unit = 128 + chain;
> > +	int max_unit = 256;
> >   	const char *name;
> >   	char _name[16];
> >
> > _______________________________________________
> > Alsa-devel mailing list
> > Alsa-devel@alsa-project.org
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 
> 
> -- 
> Maciej Paszta
> Mobile Systems Research Labs, Poznan University of Technology
> 
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>