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ALSA: pcm: Build pcm notifier code conditionally 

The PCM notifier code is used only by OSS emulation layer, so we can
build it conditionally for reducing the size.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2017-05-12 11:35:17 +02:00
parent 239480ab92
commit 58f30d650c
2 changed files with 28 additions and 20 deletions
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15
include/sound/pcm.h
View File

@ -531,13 +531,6 @@ struct snd_pcm {
#endif
};
struct snd_pcm_notify {
int (*n_register) (struct snd_pcm * pcm);
int (*n_disconnect) (struct snd_pcm * pcm);
int (*n_unregister) (struct snd_pcm * pcm);
struct list_head list;
};
/*
* Registering
*/
@ -552,7 +545,15 @@ int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
struct snd_pcm **rpcm);
int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
struct snd_pcm_notify {
int (*n_register) (struct snd_pcm * pcm);
int (*n_disconnect) (struct snd_pcm * pcm);
int (*n_unregister) (struct snd_pcm * pcm);
struct list_head list;
};
int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
#endif
/*
* Native I/O

33
sound/core/pcm.c
View File

@ -36,8 +36,10 @@ MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
MODULE_LICENSE("GPL");
static LIST_HEAD(snd_pcm_devices);
static LIST_HEAD(snd_pcm_notify_list);
static DEFINE_MUTEX(register_mutex);
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
static LIST_HEAD(snd_pcm_notify_list);
#endif
static int snd_pcm_free(struct snd_pcm *pcm);
static int snd_pcm_dev_free(struct snd_device *device);
@ -884,16 +886,23 @@ static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
put_device(&pstr->dev);
}
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
#define pcm_call_notify(pcm, call) \
do { \
struct snd_pcm_notify *_notify; \
list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
_notify->call(pcm); \
} while (0)
#else
#define pcm_call_notify(pcm, call) /* NOP */
#endif
static int snd_pcm_free(struct snd_pcm *pcm)
{
struct snd_pcm_notify *notify;
if (!pcm)
return 0;
if (!pcm->internal) {
list_for_each_entry(notify, &snd_pcm_notify_list, list)
notify->n_unregister(pcm);
}
if (!pcm->internal)
pcm_call_notify(pcm, n_unregister);
if (pcm->private_free)
pcm->private_free(pcm);
snd_pcm_lib_preallocate_free_for_all(pcm);
@ -1069,7 +1078,6 @@ static int snd_pcm_dev_register(struct snd_device *device)
{
int cidx, err;
struct snd_pcm_substream *substream;
struct snd_pcm_notify *notify;
struct snd_pcm *pcm;
if (snd_BUG_ON(!device || !device->device_data))
@ -1107,8 +1115,7 @@ static int snd_pcm_dev_register(struct snd_device *device)
snd_pcm_timer_init(substream);
}
list_for_each_entry(notify, &snd_pcm_notify_list, list)
notify->n_register(pcm);
pcm_call_notify(pcm, n_register);
unlock:
mutex_unlock(&register_mutex);
@ -1118,7 +1125,6 @@ static int snd_pcm_dev_register(struct snd_device *device)
static int snd_pcm_dev_disconnect(struct snd_device *device)
{
struct snd_pcm *pcm = device->device_data;
struct snd_pcm_notify *notify;
struct snd_pcm_substream *substream;
int cidx;
@ -1138,8 +1144,7 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
}
}
if (!pcm->internal) {
list_for_each_entry(notify, &snd_pcm_notify_list, list)
notify->n_disconnect(pcm);
pcm_call_notify(pcm, n_disconnect);
}
for (cidx = 0; cidx < 2; cidx++) {
if (!pcm->internal)
@ -1151,6 +1156,7 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
return 0;
}
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
/**
* snd_pcm_notify - Add/remove the notify list
* @notify: PCM notify list
@ -1183,6 +1189,7 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
return 0;
}
EXPORT_SYMBOL(snd_pcm_notify);
#endif /* CONFIG_SND_PCM_OSS */
#ifdef CONFIG_SND_PROC_FS
/*