[PATCH 3.19 111/177] ALSA: fireworks/bebob/dice/oxfw: make it possible to shutdown safely

Greg Kroah-Hartman
2015-03-16T14:16:06Z

From: Takashi Sakamoto <o-takashi@sakamocchi.jp>

commit dec84316dd53c90e93b4ee849483bd4bd1e9a585 upstream.

A part of these drivers, especially BeBoB driver, are programmed to wait
some events. Thus the drivers should not destroy any data in .remove()
context.

This commit moves some destructors from 'struct fw_driver.remove()' to
'struct snd_card.private_free()' to shutdown safely.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/firewire/bebob/bebob.c | 10 ++++++----
sound/firewire/bebob/bebob_stream.c | 4 ----
sound/firewire/dice/dice.c | 5 +----
sound/firewire/fireworks/fireworks.c | 10 ++++------
sound/firewire/fireworks/fireworks_stream.c | 4 ----
sound/firewire/oxfw/oxfw.c | 10 ++++------
6 files changed, 15 insertions(+), 28 deletions(-)

--- a/sound/firewire/bebob/bebob.c
+++ b/sound/firewire/bebob/bebob.c
@@ -127,8 +127,11 @@ bebob_card_free(struct snd_card *card)
{
struct snd_bebob *bebob = card->private_data;

+ snd_bebob_stream_destroy_duplex(bebob);
fw_unit_put(bebob->unit);

+ kfree(bebob->maudio_special_quirk);
+
if (bebob->card_index >= 0) {
mutex_lock(&devices_mutex);
clear_bit(bebob->card_index, devices_used);
@@ -314,10 +317,9 @@ static void bebob_remove(struct fw_unit
if (bebob == NULL)
return;

- kfree(bebob->maudio_special_quirk);
-
- snd_bebob_stream_destroy_duplex(bebob);
- snd_card_disconnect(bebob->card);
+ /* Awake bus-reset waiters. */
+ if (!completion_done(&bebob->bus_reset))
+ complete_all(&bebob->bus_reset);

/* No need to wait for releasing card object in this context. */
snd_card_free_when_closed(bebob->card);
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -716,14 +716,10 @@ void snd_bebob_stream_update_duplex(stru
*/
void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob)
{
- mutex_lock(&bebob->mutex);
-
amdtp_stream_destroy(&bebob->rx_stream);
amdtp_stream_destroy(&bebob->tx_stream);

destroy_both_connections(bebob);
-
- mutex_unlock(&bebob->mutex);
}

/*
--- a/sound/firewire/dice/dice.c
+++ b/sound/firewire/dice/dice.c
@@ -236,6 +236,7 @@ static void dice_card_free(struct snd_ca
{
struct snd_dice *dice = card->private_data;

+ snd_dice_stream_destroy_duplex(dice);
snd_dice_transaction_destroy(dice);
fw_unit_put(dice->unit);

@@ -313,10 +314,6 @@ static void dice_remove(struct fw_unit *
{
struct snd_dice *dice = dev_get_drvdata(&unit->device);

- snd_card_disconnect(dice->card);
-
- snd_dice_stream_destroy_duplex(dice);
-
/* No need to wait for releasing card object in this context. */
snd_card_free_when_closed(dice->card);
}
--- a/sound/firewire/fireworks/fireworks.c
+++ b/sound/firewire/fireworks/fireworks.c
@@ -184,8 +184,12 @@ efw_card_free(struct snd_card *card)
{
struct snd_efw *efw = card->private_data;

+ snd_efw_stream_destroy_duplex(efw);
+ snd_efw_transaction_remove_instance(efw);
fw_unit_put(efw->unit);

+ kfree(efw->resp_buf);
+
if (efw->card_index >= 0) {
mutex_lock(&devices_mutex);
clear_bit(efw->card_index, devices_used);
@@ -193,7 +197,6 @@ efw_card_free(struct snd_card *card)
}

mutex_destroy(&efw->mutex);
- kfree(efw->resp_buf);
}

static int
@@ -297,11 +300,6 @@ static void efw_remove(struct fw_unit *u
{
struct snd_efw *efw = dev_get_drvdata(&unit->device);

- snd_efw_stream_destroy_duplex(efw);
- snd_efw_transaction_remove_instance(efw);
-
- snd_card_disconnect(efw->card);
-
/* No need to wait for releasing card object in this context. */
snd_card_free_when_closed(efw->card);
}
--- a/sound/firewire/fireworks/fireworks_stream.c
+++ b/sound/firewire/fireworks/fireworks_stream.c
@@ -324,12 +324,8 @@ void snd_efw_stream_update_duplex(struct

void snd_efw_stream_destroy_duplex(struct snd_efw *efw)
{
- mutex_lock(&efw->mutex);
-
destroy_stream(efw, &efw->rx_stream);
destroy_stream(efw, &efw->tx_stream);
-
- mutex_unlock(&efw->mutex);
}

void snd_efw_stream_lock_changed(struct snd_efw *efw)
--- a/sound/firewire/oxfw/oxfw.c
+++ b/sound/firewire/oxfw/oxfw.c
@@ -115,6 +115,10 @@ static void oxfw_card_free(struct snd_ca
struct snd_oxfw *oxfw = card->private_data;
unsigned int i;

+ snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
+ if (oxfw->has_output)
+ snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->tx_stream);
+
fw_unit_put(oxfw->unit);

for (i = 0; i < SND_OXFW_STREAM_FORMAT_ENTRIES; i++) {
@@ -220,12 +224,6 @@ static void oxfw_remove(struct fw_unit *
{
struct snd_oxfw *oxfw = dev_get_drvdata(&unit->device);

- snd_card_disconnect(oxfw->card);
-
- snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->rx_stream);
- if (oxfw->has_output)
- snd_oxfw_stream_destroy_simplex(oxfw, &oxfw->tx_stream);
-
/* No need to wait for releasing card object in this context. */
snd_card_free_when_closed(oxfw->card);
}