From: Clemens Ladisch <clemens@ladisch.de>
Date: Sun, 4 Sep 2011 20:17:45 +0000 (+0200)
Subject: ALSA: dice: avoid superflous write at bus reset
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=eadce07faa8e71d8a0fc7501a5167fb999200225;p=deliverable%2Flinux.git

ALSA: dice: avoid superflous write at bus reset

When a bus reset happens, the enable register is automatically cleared,
so we do not need to clear it manually when stopping the stream.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
---

diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c
index 59d5ca4438b2..cfa98a83acb2 100644
--- a/sound/firewire/dice.c
+++ b/sound/firewire/dice.c
@@ -246,6 +246,9 @@ static void dice_enable_clear(struct dice *dice)
 {
 	__be32 value;
 
+	if (!dice->global_enabled)
+		return;
+
 	value = 0;
 	snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
 			   global_address(dice, GLOBAL_ENABLE),
@@ -1009,6 +1012,8 @@ static void dice_bus_reset(struct fw_unit *unit)
 	 * manner.
 	 */
 	amdtp_out_stream_pcm_abort(&dice->stream);
+
+	dice->global_enabled = false;
 	dice_stream_stop_packets(dice);
 
 	dice_owner_update(dice);