ALSA: firewire: fireface: 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 <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

sound/firewire/fireface/ff-hwdep.c

···
 			       poll_table *wait)
 {
 	struct snd_ff *ff = hwdep->private_data;
-	__poll_t events;
 
 	poll_wait(file, &ff->hwdep_wait, wait);
 
-	spin_lock_irq(&ff->lock);
+	guard(spinlock_irq)(&ff->lock);
 	if (ff->dev_lock_changed || has_msg(ff))
-		events = EPOLLIN | EPOLLRDNORM;
+		return EPOLLIN | EPOLLRDNORM;
 	else
-		events = 0;
-	spin_unlock_irq(&ff->lock);
-
-	return events;
+		return 0;
 }
 
 static int hwdep_get_info(struct snd_ff *ff, void __user *arg)
···
 
 static int hwdep_lock(struct snd_ff *ff)
 {
-	int err;
-
-	spin_lock_irq(&ff->lock);
+	guard(spinlock_irq)(&ff->lock);
 
 	if (ff->dev_lock_count == 0) {
 		ff->dev_lock_count = -1;
-		err = 0;
+		return 0;
 	} else {
-		err = -EBUSY;
+		return -EBUSY;
 	}
-
-	spin_unlock_irq(&ff->lock);
-
-	return err;
 }
 
 static int hwdep_unlock(struct snd_ff *ff)
 {
-	int err;
-
-	spin_lock_irq(&ff->lock);
+	guard(spinlock_irq)(&ff->lock);
 
 	if (ff->dev_lock_count == -1) {
 		ff->dev_lock_count = 0;
-		err = 0;
+		return 0;
 	} else {
-		err = -EBADFD;
+		return -EBADFD;
 	}
-
-	spin_unlock_irq(&ff->lock);
-
-	return err;
 }
 
 static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
 {
 	struct snd_ff *ff = hwdep->private_data;
 
-	spin_lock_irq(&ff->lock);
+	guard(spinlock_irq)(&ff->lock);
 	if (ff->dev_lock_count == -1)
 		ff->dev_lock_count = 0;
-	spin_unlock_irq(&ff->lock);
 
 	return 0;
 }

sound/firewire/fireface/ff-midi.c

···
 				 int up)
 {
 	struct snd_ff *ff = substream->rmidi->private_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&ff->lock, flags);
+	guard(spinlock_irqsave)(&ff->lock);
 
 	if (up)
 		WRITE_ONCE(ff->tx_midi_substreams[substream->number],
 			   substream);
 	else
 		WRITE_ONCE(ff->tx_midi_substreams[substream->number], NULL);
-
-	spin_unlock_irqrestore(&ff->lock, flags);
 }
 
 static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
 				  int up)
 {
 	struct snd_ff *ff = substream->rmidi->private_data;
-	unsigned long flags;
 
-	spin_lock_irqsave(&ff->lock, flags);
+	guard(spinlock_irqsave)(&ff->lock);
 
 	if (up || !ff->rx_midi_error[substream->number])
 		schedule_work(&ff->rx_midi_work[substream->number]);
-
-	spin_unlock_irqrestore(&ff->lock, flags);
 }
 
 static void set_midi_substream_names(struct snd_rawmidi_str *stream,

sound/firewire/fireface/ff-stream.c

···
 
 int snd_ff_stream_lock_try(struct snd_ff *ff)
 {
-	int err;
-
-	spin_lock_irq(&ff->lock);
+	guard(spinlock_irq)(&ff->lock);
 
 	/* user land lock this */
-	if (ff->dev_lock_count < 0) {
-		err = -EBUSY;
-		goto end;
-	}
+	if (ff->dev_lock_count < 0)
+		return -EBUSY;
 
 	/* this is the first time */
 	if (ff->dev_lock_count++ == 0)
 		snd_ff_stream_lock_changed(ff);
-	err = 0;
-end:
-	spin_unlock_irq(&ff->lock);
-	return err;
+	return 0;
 }
 
 void snd_ff_stream_lock_release(struct snd_ff *ff)
 {
-	spin_lock_irq(&ff->lock);
+	guard(spinlock_irq)(&ff->lock);
 
 	if (WARN_ON(ff->dev_lock_count <= 0))
-		goto end;
+		return;
 	if (--ff->dev_lock_count == 0)
 		snd_ff_stream_lock_changed(ff);
-end:
-	spin_unlock_irq(&ff->lock);
 }

sound/firewire/fireface/ff-transaction.c

···
 	struct snd_ff *ff = callback_data;
 	__le32 *buf = data;
 	u32 tstamp = fw_request_get_timestamp(request);
-	unsigned long flag;
 
 	fw_send_response(card, request, RCODE_COMPLETE);
 
 	offset -= ff->async_handler.offset;
 
-	spin_lock_irqsave(&ff->lock, flag);
+	guard(spinlock_irqsave)(&ff->lock);
 	ff->spec->protocol->handle_msg(ff, (unsigned int)offset, buf, length, tstamp);
-	spin_unlock_irqrestore(&ff->lock, flag);
 }
 
 static int allocate_own_address(struct snd_ff *ff, int i)