ALSA: dice: code refactoring to stop packet streaming

This commit is a part of preparation to perform allocation/release
of isochronous resources in pcm.hw_params/hw_free callbacks.

There're three points to finish packet streaming but no helper
functions for common operations for it. This commit adds a helper
function for operations to finish packet streaming.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
index c3c892c..8bce923 100644 (file)
--- a/sound/firewire/dice/dice-stream.c
+++ b/sound/firewire/dice/dice-stream.c
@@ -230,6 +230,15 @@ static int keep_resources(struct snd_dice *dice,
                                fw_parent_device(dice->unit)->max_speed);
 }
 
+static void finish_session(struct snd_dice *dice, struct reg_params *tx_params,
+                          struct reg_params *rx_params)
+{
+       stop_streams(dice, AMDTP_IN_STREAM, tx_params);
+       stop_streams(dice, AMDTP_OUT_STREAM, rx_params);
+
+       snd_dice_transaction_clear_enable(dice);
+}
+
 static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir,
                         unsigned int rate, struct reg_params *params)
 {
@@ -328,10 +337,8 @@ static int start_duplex_streams(struct snd_dice *dice, unsigned int rate)
        if (err < 0)
                return err;
 
-       /* Stop transmission. */
-       stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
-       stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
-       snd_dice_transaction_clear_enable(dice);
+       // Stop transmission.
+       finish_session(dice, &tx_params, &rx_params);
        release_resources(dice);
 
        err = ensure_phase_lock(dice, rate);
@@ -373,9 +380,7 @@ static int start_duplex_streams(struct snd_dice *dice, unsigned int rate)
 
        return 0;
 error:
-       stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
-       stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
-       snd_dice_transaction_clear_enable(dice);
+       finish_session(dice, &tx_params, &rx_params);
        release_resources(dice);
        return err;
 }
@@ -449,12 +454,8 @@ void snd_dice_stream_stop_duplex(struct snd_dice *dice)
        if (dice->substreams_counter > 0)
                return;
 
-       snd_dice_transaction_clear_enable(dice);
-
-       if (get_register_params(dice, &tx_params, &rx_params) == 0) {
-               stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
-               stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
-       }
+       if (get_register_params(dice, &tx_params, &rx_params) >= 0)
+               finish_session(dice, &tx_params, &rx_params);
 
        release_resources(dice);
 }