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ALSA: firewire-digi00x: cease from delayed card registration 

The delayed registration of sound card instance brings less benefit than
complication of kobject management. This commit ceases from it.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210607081250.13397-6-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2021-06-07 17:12:46 +09:00 committed by Takashi Iwai
parent 9536c7512c
commit 9067c181c3
2 changed files with 29 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

101
sound/firewire/digi00x/digi00x.c
View File

@ -47,23 +47,32 @@ static void dg00x_card_free(struct snd_card *card)
snd_dg00x_stream_destroy_duplex(dg00x);
snd_dg00x_transaction_unregister(dg00x);
mutex_destroy(&dg00x->mutex);
fw_unit_put(dg00x->unit);
}
static void do_registration(struct work_struct *work)
static int snd_dg00x_probe(struct fw_unit *unit, const struct ieee1394_device_id *entry)
{
struct snd_dg00x *dg00x =
container_of(work, struct snd_dg00x, dwork.work);
struct snd_card *card;
struct snd_dg00x *dg00x;
int err;
if (dg00x->registered)
return;
err = snd_card_new(&dg00x->unit->device, -1, NULL, THIS_MODULE, 0,
&dg00x->card);
err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE, sizeof(*dg00x), &card);
if (err < 0)
return;
dg00x->card->private_free = dg00x_card_free;
dg00x->card->private_data = dg00x;
return err;
card->private_free = dg00x_card_free;
dg00x = card->private_data;
dg00x->unit = fw_unit_get(unit);
dev_set_drvdata(&unit->device, dg00x);
dg00x->card = card;
mutex_init(&dg00x->mutex);
spin_lock_init(&dg00x->lock);
init_waitqueue_head(&dg00x->hwdep_wait);
dg00x->is_console = entry->model_id == MODEL_CONSOLE;
err = name_card(dg00x);
if (err < 0)
@ -91,85 +100,33 @@ static void do_registration(struct work_struct *work)
if (err < 0)
goto error;
err = snd_card_register(dg00x->card);
err = snd_card_register(card);
if (err < 0)
goto error;
dg00x->registered = true;
return;
error:
snd_card_free(dg00x->card);
dev_info(&dg00x->unit->device,
"Sound card registration failed: %d\n", err);
}
static int snd_dg00x_probe(struct fw_unit *unit,
const struct ieee1394_device_id *entry)
{
struct snd_dg00x *dg00x;
/* Allocate this independent of sound card instance. */
dg00x = devm_kzalloc(&unit->device, sizeof(struct snd_dg00x),
GFP_KERNEL);
if (!dg00x)
return -ENOMEM;
dg00x->unit = fw_unit_get(unit);
dev_set_drvdata(&unit->device, dg00x);
mutex_init(&dg00x->mutex);
spin_lock_init(&dg00x->lock);
init_waitqueue_head(&dg00x->hwdep_wait);
dg00x->is_console = entry->model_id == MODEL_CONSOLE;
/* Allocate and register this sound card later. */
INIT_DEFERRABLE_WORK(&dg00x->dwork, do_registration);
snd_fw_schedule_registration(unit, &dg00x->dwork);
return 0;
error:
snd_card_free(card);
return err;
}
static void snd_dg00x_update(struct fw_unit *unit)
{
struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);
/* Postpone a workqueue for deferred registration. */
if (!dg00x->registered)
snd_fw_schedule_registration(unit, &dg00x->dwork);
snd_dg00x_transaction_reregister(dg00x);
/*
* After registration, userspace can start packet streaming, then this
* code block works fine.
*/
if (dg00x->registered) {
mutex_lock(&dg00x->mutex);
snd_dg00x_stream_update_duplex(dg00x);
mutex_unlock(&dg00x->mutex);
}
mutex_lock(&dg00x->mutex);
snd_dg00x_stream_update_duplex(dg00x);
mutex_unlock(&dg00x->mutex);
}
static void snd_dg00x_remove(struct fw_unit *unit)
{
struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device);
/*
* Confirm to stop the work for registration before the sound card is
* going to be released. The work is not scheduled again because bus
* reset handler is not called anymore.
*/
cancel_delayed_work_sync(&dg00x->dwork);
if (dg00x->registered) {
// Block till all of ALSA character devices are released.
snd_card_free(dg00x->card);
}
mutex_destroy(&dg00x->mutex);
fw_unit_put(dg00x->unit);
// Block till all of ALSA character devices are released.
snd_card_free(dg00x->card);
}
static const struct ieee1394_device_id snd_dg00x_id_table[] = {

3
sound/firewire/digi00x/digi00x.h
View File

@ -37,9 +37,6 @@ struct snd_dg00x {
struct mutex mutex;
spinlock_t lock;
bool registered;
struct delayed_work dwork;
struct amdtp_stream tx_stream;
struct fw_iso_resources tx_resources;