ALSA: fireworks/bebob/dice/oxfw: make it possible to shutdown safely

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>
Cc: <stable@vger.kernel.org> # 3.19+
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 4 insertions, 10 deletions

diff --git a/sound/firewire/fireworks/fireworks.c b/sound/firewire/fireworks/fireworks.c
index 1e33394d8a93..2682e7e3e5c9 100644
--- 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 *unit)
 {
         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);
 }
diff --git a/sound/firewire/fireworks/fireworks_stream.c b/sound/firewire/fireworks/fireworks_stream.c
index f817b7ae097e..c55db1bddc80 100644
--- 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 snd_efw *efw)
 
 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)