ALSA: opl4: Use guard() for mutex locks

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

Only code refactoring, and no behavior change.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250829150026.6379-6-tiwai@suse.de

2 files changed, 15 insertions, 25 deletions

diff --git a/sound/drivers/opl4/opl4_proc.c b/sound/drivers/opl4/opl4_proc.c
index f2149091e10a..fd0ba4704d9f 100644
--- a/sound/drivers/opl4/opl4_proc.c
+++ b/sound/drivers/opl4/opl4_proc.c
@@ -14,13 +14,10 @@ static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
 {
 	struct snd_opl4 *opl4 = entry->private_data;
 
-	mutex_lock(&opl4->access_mutex);
-	if (opl4->memory_access) {
-		mutex_unlock(&opl4->access_mutex);
+	guard(mutex)(&opl4->access_mutex);
+	if (opl4->memory_access)
 		return -EBUSY;
-	}
 	opl4->memory_access++;
-	mutex_unlock(&opl4->access_mutex);
 	return 0;
 }
 
@@ -29,9 +26,8 @@ static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
 {
 	struct snd_opl4 *opl4 = entry->private_data;
 
-	mutex_lock(&opl4->access_mutex);
+	guard(mutex)(&opl4->access_mutex);
 	opl4->memory_access--;
-	mutex_unlock(&opl4->access_mutex);
 	return 0;
 }
 
diff --git a/sound/drivers/opl4/opl4_seq.c b/sound/drivers/opl4/opl4_seq.c
index f59ca660c616..7bb22089a093 100644
--- a/sound/drivers/opl4/opl4_seq.c
+++ b/sound/drivers/opl4/opl4_seq.c
@@ -63,24 +63,18 @@ static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *i
 	struct snd_opl4 *opl4 = private_data;
 	int err;
 
-	mutex_lock(&opl4->access_mutex);
-
-	if (opl4->used) {
-		mutex_unlock(&opl4->access_mutex);
-		return -EBUSY;
-	}
-	opl4->used++;
-
-	if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
-		err = snd_opl4_seq_use_inc(opl4);
-		if (err < 0) {
-			mutex_unlock(&opl4->access_mutex);
-			return err;
+	scoped_guard(mutex, &opl4->access_mutex) {
+		if (opl4->used)
+			return -EBUSY;
+		opl4->used++;
+
+		if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) {
+			err = snd_opl4_seq_use_inc(opl4);
+			if (err < 0)
+				return err;
 		}
 	}
 
-	mutex_unlock(&opl4->access_mutex);
-
 	snd_opl4_synth_reset(opl4);
 	return 0;
 }
@@ -91,9 +85,9 @@ static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe
 
 	snd_opl4_synth_shutdown(opl4);
 
-	mutex_lock(&opl4->access_mutex);
-	opl4->used--;
-	mutex_unlock(&opl4->access_mutex);
+	scoped_guard(mutex, &opl4->access_mutex) {
+		opl4->used--;
+	}
 
 	if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM)
 		snd_opl4_seq_use_dec(opl4);