ALSA: firewire: motu: Use guard() for mutex locks

Replace the manual mutex lock/unlock pairs with guard() for code
simplification.

Only code refactoring, and no behavior change.

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250828132802.9032-6-tiwai@suse.de

1 files changed, 43 insertions, 49 deletions

diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c
index 7b4d476af348..600c571edf02 100644
--- a/sound/firewire/motu/motu-pcm.c
+++ b/sound/firewire/motu/motu-pcm.c
@@ -138,59 +138,56 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	if (err < 0)
 		return err;
 
-	mutex_lock(&motu->mutex);
-
-	err = snd_motu_stream_cache_packet_formats(motu);
-	if (err < 0)
-		goto err_locked;
-
-	err = init_hw_info(motu, substream);
-	if (err < 0)
-		goto err_locked;
+	scoped_guard(mutex, &motu->mutex) {
+		err = snd_motu_stream_cache_packet_formats(motu);
+		if (err < 0)
+			goto err_locked;
 
-	err = snd_motu_protocol_get_clock_source(motu, &src);
-	if (err < 0)
-		goto err_locked;
-
-	// When source of clock is not internal or any stream is reserved for
-	// transmission of PCM frames, the available sampling rate is limited
-	// at current one.
-	if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL &&
-	     src != SND_MOTU_CLOCK_SOURCE_SPH) ||
-	    (motu->substreams_counter > 0 && d->events_per_period > 0)) {
-		unsigned int frames_per_period = d->events_per_period;
-		unsigned int frames_per_buffer = d->events_per_buffer;
-		unsigned int rate;
-
-		err = snd_motu_protocol_get_clock_rate(motu, &rate);
+		err = init_hw_info(motu, substream);
 		if (err < 0)
 			goto err_locked;
 
-		substream->runtime->hw.rate_min = rate;
-		substream->runtime->hw.rate_max = rate;
+		err = snd_motu_protocol_get_clock_source(motu, &src);
+		if (err < 0)
+			goto err_locked;
 
-		if (frames_per_period > 0) {
-			err = snd_pcm_hw_constraint_minmax(substream->runtime,
-					SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
-					frames_per_period, frames_per_period);
+		// When source of clock is not internal or any stream is reserved for
+		// transmission of PCM frames, the available sampling rate is limited
+		// at current one.
+		if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL &&
+		     src != SND_MOTU_CLOCK_SOURCE_SPH) ||
+		    (motu->substreams_counter > 0 && d->events_per_period > 0)) {
+			unsigned int frames_per_period = d->events_per_period;
+			unsigned int frames_per_buffer = d->events_per_buffer;
+			unsigned int rate;
+
+			err = snd_motu_protocol_get_clock_rate(motu, &rate);
 			if (err < 0)
 				goto err_locked;
 
-			err = snd_pcm_hw_constraint_minmax(substream->runtime,
-					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
-					frames_per_buffer, frames_per_buffer);
-			if (err < 0)
-				goto err_locked;
+			substream->runtime->hw.rate_min = rate;
+			substream->runtime->hw.rate_max = rate;
+
+			if (frames_per_period > 0) {
+				err = snd_pcm_hw_constraint_minmax(substream->runtime,
+								   SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+								   frames_per_period, frames_per_period);
+				if (err < 0)
+					goto err_locked;
+
+				err = snd_pcm_hw_constraint_minmax(substream->runtime,
+								   SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+								   frames_per_buffer, frames_per_buffer);
+				if (err < 0)
+					goto err_locked;
+			}
 		}
 	}
 
 	snd_pcm_set_sync(substream);
 
-	mutex_unlock(&motu->mutex);
-
 	return 0;
 err_locked:
-	mutex_unlock(&motu->mutex);
 	snd_motu_stream_lock_release(motu);
 	return err;
 }
@@ -215,12 +212,11 @@ static int pcm_hw_params(struct snd_pcm_substream *substream,
 		unsigned int frames_per_period = params_period_size(hw_params);
 		unsigned int frames_per_buffer = params_buffer_size(hw_params);
 
-		mutex_lock(&motu->mutex);
+		guard(mutex)(&motu->mutex);
 		err = snd_motu_stream_reserve_duplex(motu, rate,
 					frames_per_period, frames_per_buffer);
 		if (err >= 0)
 			++motu->substreams_counter;
-		mutex_unlock(&motu->mutex);
 	}
 
 	return err;
@@ -230,15 +226,13 @@ static int pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;
 
-	mutex_lock(&motu->mutex);
+	guard(mutex)(&motu->mutex);
 
 	if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
 		--motu->substreams_counter;
 
 	snd_motu_stream_stop_duplex(motu);
 
-	mutex_unlock(&motu->mutex);
-
 	return 0;
 }
 
@@ -247,9 +241,9 @@ static int capture_prepare(struct snd_pcm_substream *substream)
 	struct snd_motu *motu = substream->private_data;
 	int err;
 
-	mutex_lock(&motu->mutex);
-	err = snd_motu_stream_start_duplex(motu);
-	mutex_unlock(&motu->mutex);
+	scoped_guard(mutex, &motu->mutex) {
+		err = snd_motu_stream_start_duplex(motu);
+	}
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(&motu->tx_stream);
 
@@ -260,9 +254,9 @@ static int playback_prepare(struct snd_pcm_substream *substream)
 	struct snd_motu *motu = substream->private_data;
 	int err;
 
-	mutex_lock(&motu->mutex);
-	err = snd_motu_stream_start_duplex(motu);
-	mutex_unlock(&motu->mutex);
+	scoped_guard(mutex, &motu->mutex) {
+		err = snd_motu_stream_start_duplex(motu);
+	}
 	if (err >= 0)
 		amdtp_stream_pcm_prepare(&motu->rx_stream);