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ALSA: oxfw: delayed registration of sound card
Some oxfw based units tends to fail asynchronous communication when IEEE 1394 bus is under bus-reset state. When registering sound card instance at unit probe callback, userspace applications can be involved to the state. This commit postpones the registration till the bus is calm. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto
Takashi Iwai
parent
7d3c1d5901
commit
6c29230e2a
@ -118,15 +118,8 @@ end:
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return err;
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}
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/*
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* This module releases the FireWire unit data after all ALSA character devices
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* are released by applications. This is for releasing stream data or finishing
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* transactions safely. Thus at returning from .remove(), this module still keep
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* references for the unit.
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*/
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static void oxfw_card_free(struct snd_card *card)
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static void oxfw_free(struct snd_oxfw *oxfw)
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{
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struct snd_oxfw *oxfw = card->private_data;
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unsigned int i;
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snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
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@ -144,6 +137,17 @@ static void oxfw_card_free(struct snd_card *card)
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mutex_destroy(&oxfw->mutex);
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}
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/*
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* This module releases the FireWire unit data after all ALSA character devices
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* are released by applications. This is for releasing stream data or finishing
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* transactions safely. Thus at returning from .remove(), this module still keep
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* references for the unit.
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*/
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static void oxfw_card_free(struct snd_card *card)
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{
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oxfw_free(card->private_data);
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}
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static int detect_quirks(struct snd_oxfw *oxfw)
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{
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struct fw_device *fw_dev = fw_parent_device(oxfw->unit);
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@ -205,33 +209,18 @@ static int detect_quirks(struct snd_oxfw *oxfw)
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return 0;
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}
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static int oxfw_probe(struct fw_unit *unit,
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const struct ieee1394_device_id *entry)
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static void do_registration(struct work_struct *work)
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{
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struct snd_card *card;
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struct snd_oxfw *oxfw;
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struct snd_oxfw *oxfw = container_of(work, struct snd_oxfw, dwork.work);
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int err;
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if (entry->vendor_id == VENDOR_LOUD && !detect_loud_models(unit))
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return -ENODEV;
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if (oxfw->registered)
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return;
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err = snd_card_new(&unit->device, -1, NULL, THIS_MODULE,
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sizeof(*oxfw), &card);
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err = snd_card_new(&oxfw->unit->device, -1, NULL, THIS_MODULE, 0,
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&oxfw->card);
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if (err < 0)
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return err;
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card->private_free = oxfw_card_free;
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oxfw = card->private_data;
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oxfw->card = card;
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mutex_init(&oxfw->mutex);
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oxfw->unit = fw_unit_get(unit);
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oxfw->entry = entry;
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spin_lock_init(&oxfw->lock);
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init_waitqueue_head(&oxfw->hwdep_wait);
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err = snd_oxfw_stream_discover(oxfw);
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if (err < 0)
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goto error;
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return;
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err = name_card(oxfw);
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if (err < 0)
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@ -241,6 +230,19 @@ static int oxfw_probe(struct fw_unit *unit,
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if (err < 0)
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goto error;
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err = snd_oxfw_stream_discover(oxfw);
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if (err < 0)
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goto error;
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err = snd_oxfw_stream_init_simplex(oxfw, &oxfw->rx_stream);
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if (err < 0)
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goto error;
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if (oxfw->has_output) {
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err = snd_oxfw_stream_init_simplex(oxfw, &oxfw->tx_stream);
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if (err < 0)
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goto error;
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}
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err = snd_oxfw_create_pcm(oxfw);
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if (err < 0)
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goto error;
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@ -255,54 +257,97 @@ static int oxfw_probe(struct fw_unit *unit,
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if (err < 0)
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goto error;
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err = snd_oxfw_stream_init_simplex(oxfw, &oxfw->rx_stream);
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err = snd_card_register(oxfw->card);
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if (err < 0)
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goto error;
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if (oxfw->has_output) {
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err = snd_oxfw_stream_init_simplex(oxfw, &oxfw->tx_stream);
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if (err < 0)
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goto error;
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}
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err = snd_card_register(card);
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if (err < 0) {
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snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
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if (oxfw->has_output)
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snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->tx_stream);
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goto error;
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}
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/*
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* After registered, oxfw instance can be released corresponding to
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* releasing the sound card instance.
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*/
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oxfw->card->private_free = oxfw_card_free;
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oxfw->card->private_data = oxfw;
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oxfw->registered = true;
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return;
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error:
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snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
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if (oxfw->has_output)
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snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->tx_stream);
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snd_card_free(oxfw->card);
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dev_info(&oxfw->unit->device,
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"Sound card registration failed: %d\n", err);
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}
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static int oxfw_probe(struct fw_unit *unit,
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const struct ieee1394_device_id *entry)
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{
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struct snd_oxfw *oxfw;
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if (entry->vendor_id == VENDOR_LOUD && !detect_loud_models(unit))
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return -ENODEV;
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/* Allocate this independent of sound card instance. */
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oxfw = kzalloc(sizeof(struct snd_oxfw), GFP_KERNEL);
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if (oxfw == NULL)
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return -ENOMEM;
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oxfw->entry = entry;
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oxfw->unit = fw_unit_get(unit);
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dev_set_drvdata(&unit->device, oxfw);
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mutex_init(&oxfw->mutex);
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spin_lock_init(&oxfw->lock);
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init_waitqueue_head(&oxfw->hwdep_wait);
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/* Allocate and register this sound card later. */
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INIT_DEFERRABLE_WORK(&oxfw->dwork, do_registration);
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snd_fw_schedule_registration(unit, &oxfw->dwork);
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return 0;
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error:
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snd_card_free(card);
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return err;
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}
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static void oxfw_bus_reset(struct fw_unit *unit)
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{
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struct snd_oxfw *oxfw = dev_get_drvdata(&unit->device);
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if (!oxfw->registered)
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snd_fw_schedule_registration(unit, &oxfw->dwork);
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fcp_bus_reset(oxfw->unit);
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mutex_lock(&oxfw->mutex);
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if (oxfw->registered) {
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mutex_lock(&oxfw->mutex);
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snd_oxfw_stream_update_simplex(oxfw, &oxfw->rx_stream);
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if (oxfw->has_output)
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snd_oxfw_stream_update_simplex(oxfw, &oxfw->tx_stream);
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snd_oxfw_stream_update_simplex(oxfw, &oxfw->rx_stream);
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if (oxfw->has_output)
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snd_oxfw_stream_update_simplex(oxfw, &oxfw->tx_stream);
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mutex_unlock(&oxfw->mutex);
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mutex_unlock(&oxfw->mutex);
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if (oxfw->entry->vendor_id == OUI_STANTON)
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snd_oxfw_scs1x_update(oxfw);
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if (oxfw->entry->vendor_id == OUI_STANTON)
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snd_oxfw_scs1x_update(oxfw);
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}
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}
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static void oxfw_remove(struct fw_unit *unit)
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{
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struct snd_oxfw *oxfw = dev_get_drvdata(&unit->device);
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/* No need to wait for releasing card object in this context. */
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snd_card_free_when_closed(oxfw->card);
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/*
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* Confirm to stop the work for registration before the sound card is
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* going to be released. The work is not scheduled again because bus
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* reset handler is not called anymore.
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*/
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cancel_delayed_work_sync(&oxfw->dwork);
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if (oxfw->registered) {
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/* No need to wait for releasing card object in this context. */
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snd_card_free_when_closed(oxfw->card);
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} else {
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/* Don't forget this case. */
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oxfw_free(oxfw);
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}
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}
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static const struct compat_info griffin_firewave = {
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@ -39,6 +39,9 @@ struct snd_oxfw {
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struct mutex mutex;
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spinlock_t lock;
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bool registered;
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struct delayed_work dwork;
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bool wrong_dbs;
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bool has_output;
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u8 *tx_stream_formats[SND_OXFW_STREAM_FORMAT_ENTRIES];
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