Re: [Alsa-devel] [RFC: 2.6 patch] sound/: possible cleanups

[Adrian Bunk]

On Tue, Dec 19, 2006 at 12:06:57PM +0100, Takashi Iwai wrote:
> At Mon, 18 Dec 2006 04:46:39 +0100,
> Adrian Bunk wrote:
> > 
> > --- linux-2.6.19-rc6-mm2/sound/pci/hda/hda_codec.h.old	2006-12-04 17:03:15.000000000 +0100
> > +++ linux-2.6.19-rc6-mm2/sound/pci/hda/hda_codec.h	2006-12-04 17:03:23.000000000 +0100
> > @@ -614,10 +614,6 @@
> >  				int channel_id, int format);
> >  unsigned int snd_hda_calc_stream_format(unsigned int rate, unsigned int channels,
> >  					unsigned int format, unsigned int maxbps);
> > -int snd_hda_query_supported_pcm(struct hda_codec *codec, hda_nid_t nid,
> > -				u32 *ratesp, u64 *formatsp, unsigned int *bpsp);
> > -int snd_hda_is_supported_format(struct hda_codec *codec, hda_nid_t nid,
> > -				unsigned int format);
> 
> I'd like to keep them usable for codec support codes.

If they are static, they can still become global again when required
(this is not about removing them completely).

> Removing EXPORT_SYMBOL() is fine, though.

They weren't EXPORT_SYMBOL'ed.

> > --- linux-2.6.19-rc6-mm2/sound/pci/ac97/ac97_local.h.old	2006-12-04 16:53:59.000000000 +0100
> > +++ linux-2.6.19-rc6-mm2/sound/pci/ac97/ac97_local.h	2006-12-04 16:54:52.000000000 +0100
> > @@ -65,9 +65,6 @@
> >  int snd_ac97_get_volsw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol);
> >  int snd_ac97_put_volsw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol);
> >  int snd_ac97_try_bit(struct snd_ac97 * ac97, int reg, int bit);
> > -int snd_ac97_remove_ctl(struct snd_ac97 *ac97, const char *name, const char *suffix);
> > -int snd_ac97_rename_ctl(struct snd_ac97 *ac97, const char *src, const char *dst, const char *suffix);
> > -int snd_ac97_swap_ctl(struct snd_ac97 *ac97, const char *s1, const char *s2, const char *suffix);
> 
> These are used in ac97_patch.c, at least in pending patches after
> 2.6.19.

OK.

> > --- linux-2.6.19-rc6-mm2/include/sound/core.h.old	2006-12-04 17:13:39.000000000 +0100
> > +++ linux-2.6.19-rc6-mm2/include/sound/core.h	2006-12-04 17:49:07.000000000 +0100
> > @@ -22,6 +22,7 @@
> >   *
> >   */
> >  
> > +#include <sound/driver.h>
> 
> This makes things a bit complicated, so please don't add it yet.
> It's better to clean up into a single core.h in future.
> 
> > @@ -35,6 +36,7 @@
> >  #ifdef CONFIG_SBUS
> >  struct sbus_dev;
> >  #endif
> > +struct snd_info_buffer;
> >  
> >  /* device allocation stuff */
> >  
> > @@ -287,6 +289,8 @@
> >  int snd_card_file_add(struct snd_card *card, struct file *file);
> >  int snd_card_file_remove(struct snd_card *card, struct file *file);
> >  
> > +void snd_card_info_read_oss(struct snd_info_buffer *buffer);
> > +
> >  #ifndef snd_card_set_dev
> >  #define snd_card_set_dev(card,devptr) ((card)->parent = (devptr))
> >  #endif
> 
> These should be rather in another file, e.g. info.h.

How much should move to info.h?
All function prototypes?

> > --- linux-2.6.19-rc6-mm2/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl.old	2006-12-04 17:17:34.000000000 +0100
> > +++ linux-2.6.19-rc6-mm2/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl	2006-12-04 17:18:34.000000000 +0100
> > @@ -5648,8 +5648,7 @@
> >      <para>
> >  	As shown in the above, it's better to save registers after
> >  	suspending the PCM operations via
> > -	<function>snd_pcm_suspend_all()</function> or
> > -	<function>snd_pcm_suspend()</function>.  It means that the PCM
> > +	<function>snd_pcm_suspend_all()</function>.  It means that the PCM
> >  	streams are already stoppped when the register snapshot is
> >  	taken.  But, remind that you don't have to restart the PCM
> >  	stream in the resume callback. It'll be restarted via 
> > --- linux-2.6.19-rc6-mm2/include/sound/pcm.h.old	2006-12-04 17:14:50.000000000 +0100
> > +++ linux-2.6.19-rc6-mm2/include/sound/pcm.h	2006-12-04 17:20:10.000000000 +0100
> > @@ -467,10 +467,7 @@
> >  int snd_pcm_start(struct snd_pcm_substream *substream);
> >  int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
> >  int snd_pcm_drain_done(struct snd_pcm_substream *substream);
> > -#ifdef CONFIG_PM
> > -int snd_pcm_suspend(struct snd_pcm_substream *substream);
> >  int snd_pcm_suspend_all(struct snd_pcm *pcm);
> > -#endif
> >  int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
> >  int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
> >  			   struct snd_pcm_substream **rsubstream);
> 
> I tend to disagree this removal.

snd_pcm_suspend() becomes static, but doesn't get removed.
Are there any users in other files pending for the forseeable future?
Otherwise, reverting this change will never be a problem.

> thanks,
> 
> Takashi

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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