ALSA: dice: fix locking

Avoid a lock inversion between dice->mutex and pcm->open_mutex.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

sound/firewire/dice.c

@@ -981,12 +981,12 @@ static void dice_remove(struct fw_unit *unit)
 {
 	struct dice *dice = dev_get_drvdata(&unit->device);
 
-	mutex_lock(&dice->mutex);
-
 	amdtp_out_stream_pcm_abort(&dice->stream);
 
 	snd_card_disconnect(dice->card);
 
+	mutex_lock(&dice->mutex);
+
 	dice_stream_stop(dice);
 	dice_owner_clear(dice);
 
@@ -999,8 +999,6 @@ static void dice_bus_reset(struct fw_unit *unit)
 {
 	struct dice *dice = dev_get_drvdata(&unit->device);
 
-	mutex_lock(&dice->mutex);
-
 	/*
 	 * On a bus reset, the DICE firmware disables streaming and then goes
 	 * off contemplating its own navel for hundreds of milliseconds before
@@ -1011,6 +1009,8 @@ static void dice_bus_reset(struct fw_unit *unit)
 	 */
 	amdtp_out_stream_pcm_abort(&dice->stream);
 
+	mutex_lock(&dice->mutex);
+
 	dice->global_enabled = false;
 	dice_stream_stop_packets(dice);