ALSA: firewire: tascam: Use guard() for spin locks

Clean up the code using guard() for spin locks.

Merely 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/20250828132802.9032-19-tiwai@suse.de

sound/firewire/tascam/amdtp-tascam.c

@@ -157,15 +157,14 @@ static void read_status_messages(struct amdtp_stream *s,
 			if ((before ^ after) & mask) {
 				struct snd_firewire_tascam_change *entry =
 						&tscm->queue[tscm->push_pos];
-				unsigned long flag;
 
-				spin_lock_irqsave(&tscm->lock, flag);
+				scoped_guard(spinlock_irqsave, &tscm->lock) {
 					entry->index = index;
 					entry->before = before;
 					entry->after = after;
 					if (++tscm->push_pos >= SND_TSCM_QUEUE_COUNT)
 						tscm->push_pos = 0;
-				spin_unlock_irqrestore(&tscm->lock, flag);
+				}
 
 				wake_up(&tscm->hwdep_wait);
 			}

sound/firewire/tascam/tascam-hwdep.c

@@ -130,18 +130,14 @@ static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
 			       poll_table *wait)
 {
 	struct snd_tscm *tscm = hwdep->private_data;
-	__poll_t events;
 
 	poll_wait(file, &tscm->hwdep_wait, wait);
 
-	spin_lock_irq(&tscm->lock);
+	guard(spinlock_irq)(&tscm->lock);
 	if (tscm->dev_lock_changed || tscm->push_pos != tscm->pull_pos)
-		events = EPOLLIN | EPOLLRDNORM;
+		return EPOLLIN | EPOLLRDNORM;
 	else
-		events = 0;
+		return 0;
-	spin_unlock_irq(&tscm->lock);
-
-	return events;
 }
 
 static int hwdep_get_info(struct snd_tscm *tscm, void __user *arg)
@@ -165,38 +161,26 @@ static int hwdep_get_info(struct snd_tscm *tscm, void __user *arg)
 
 static int hwdep_lock(struct snd_tscm *tscm)
 {
-	int err;
+	guard(spinlock_irq)(&tscm->lock);
-
-	spin_lock_irq(&tscm->lock);
 
 	if (tscm->dev_lock_count == 0) {
 		tscm->dev_lock_count = -1;
-		err = 0;
+		return 0;
 	} else {
-		err = -EBUSY;
+		return -EBUSY;
 	}
-
-	spin_unlock_irq(&tscm->lock);
-
-	return err;
 }
 
 static int hwdep_unlock(struct snd_tscm *tscm)
 {
-	int err;
+	guard(spinlock_irq)(&tscm->lock);
-
-	spin_lock_irq(&tscm->lock);
 
 	if (tscm->dev_lock_count == -1) {
 		tscm->dev_lock_count = 0;
-		err = 0;
+		return 0;
 	} else {
-		err = -EBADFD;
+		return -EBADFD;
 	}
-
-	spin_unlock_irq(&tscm->lock);
-
-	return err;
 }
 
 static int tscm_hwdep_state(struct snd_tscm *tscm, void __user *arg)
@@ -211,10 +195,9 @@ static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
 {
 	struct snd_tscm *tscm = hwdep->private_data;
 
-	spin_lock_irq(&tscm->lock);
+	guard(spinlock_irq)(&tscm->lock);
 	if (tscm->dev_lock_count == -1)
 		tscm->dev_lock_count = 0;
-	spin_unlock_irq(&tscm->lock);
 
 	return 0;
 }

sound/firewire/tascam/tascam-midi.c

@@ -43,30 +43,24 @@ static void midi_playback_drain(struct snd_rawmidi_substream *substream)
 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
 {
 	struct snd_tscm *tscm = substrm->rmidi->private_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&tscm->lock, flags);
+	guard(spinlock_irqsave)(&tscm->lock);
 
 	if (up)
 		tscm->tx_midi_substreams[substrm->number] = substrm;
 	else
 		tscm->tx_midi_substreams[substrm->number] = NULL;
-
-	spin_unlock_irqrestore(&tscm->lock, flags);
 }
 
 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
 {
 	struct snd_tscm *tscm = substrm->rmidi->private_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&tscm->lock, flags);
+	guard(spinlock_irqsave)(&tscm->lock);
 
 	if (up)
 		snd_fw_async_midi_port_run(&tscm->out_ports[substrm->number],
 					   substrm);
-
-	spin_unlock_irqrestore(&tscm->lock, flags);
 }
 
 int snd_tscm_create_midi_devices(struct snd_tscm *tscm)

sound/firewire/tascam/tascam-stream.c

@@ -527,33 +527,24 @@ void snd_tscm_stream_lock_changed(struct snd_tscm *tscm)
 
 int snd_tscm_stream_lock_try(struct snd_tscm *tscm)
 {
-	int err;
+	guard(spinlock_irq)(&tscm->lock);
-
-	spin_lock_irq(&tscm->lock);
 
 	/* user land lock this */
-	if (tscm->dev_lock_count < 0) {
+	if (tscm->dev_lock_count < 0)
-		err = -EBUSY;
+		return -EBUSY;
-		goto end;
-	}
 
 	/* this is the first time */
 	if (tscm->dev_lock_count++ == 0)
 		snd_tscm_stream_lock_changed(tscm);
-	err = 0;
+	return 0;
-end:
-	spin_unlock_irq(&tscm->lock);
-	return err;
 }
 
 void snd_tscm_stream_lock_release(struct snd_tscm *tscm)
 {
-	spin_lock_irq(&tscm->lock);
+	guard(spinlock_irq)(&tscm->lock);
 
 	if (WARN_ON(tscm->dev_lock_count <= 0))
-		goto end;
+		return;
 	if (--tscm->dev_lock_count == 0)
 		snd_tscm_stream_lock_changed(tscm);
-end:
-	spin_unlock_irq(&tscm->lock);
 }