1 files changed, 29 insertions, 40 deletions

diff --git a/sound/firewire/fireworks/fireworks_pcm.c b/sound/firewire/fireworks/fireworks_pcm.c
index eaf7778211de..9399293a9fe9 100644
--- a/sound/firewire/fireworks/fireworks_pcm.c
+++ b/sound/firewire/fireworks/fireworks_pcm.c
@@ -189,46 +189,38 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	if (err < 0)
 		goto err_locked;
 
-	mutex_lock(&efw->mutex);
-
-	// 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 ((clock_source != SND_EFW_CLOCK_SOURCE_INTERNAL) ||
-	    (efw->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 sampling_rate;
-
-		err = snd_efw_command_get_sampling_rate(efw, &sampling_rate);
-		if (err < 0) {
-			mutex_unlock(&efw->mutex);
-			goto err_locked;
-		}
-		substream->runtime->hw.rate_min = sampling_rate;
-		substream->runtime->hw.rate_max = sampling_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) {
-				mutex_unlock(&efw->mutex);
-				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) {
-				mutex_unlock(&efw->mutex);
+	scoped_guard(mutex, &efw->mutex) {
+		// 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 ((clock_source != SND_EFW_CLOCK_SOURCE_INTERNAL) ||
+		    (efw->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 sampling_rate;
+
+			err = snd_efw_command_get_sampling_rate(efw, &sampling_rate);
+			if (err < 0)
 				goto err_locked;
+			substream->runtime->hw.rate_min = sampling_rate;
+			substream->runtime->hw.rate_max = sampling_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;
 			}
 		}
 	}
 
-	mutex_unlock(&efw->mutex);
-
 	snd_pcm_set_sync(substream);
 
 	return 0;
@@ -255,12 +247,11 @@ 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(&efw->mutex);
+		guard(mutex)(&efw->mutex);
 		err = snd_efw_stream_reserve_duplex(efw, rate,
 					frames_per_period, frames_per_buffer);
 		if (err >= 0)
 			++efw->substreams_counter;
-		mutex_unlock(&efw->mutex);
 	}
 
 	return err;
@@ -270,15 +261,13 @@ static int pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_efw *efw = substream->private_data;
 
-	mutex_lock(&efw->mutex);
+	guard(mutex)(&efw->mutex);
 
 	if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
 		--efw->substreams_counter;
 
 	snd_efw_stream_stop_duplex(efw);
 
-	mutex_unlock(&efw->mutex);
-
 	return 0;
 }