ALSA: spi/at73c213: Use guard() for spin locks

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

Merely code refactoring, and no behavior change.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: tiwai

sound/spi/at73c213.c

@@ -273,9 +273,8 @@ static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
 				   int cmd)
 {
 	struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
-	int retval = 0;
 
-	spin_lock(&chip->lock);
+	guard(spinlock)(&chip->lock);
 
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
@@ -288,13 +287,11 @@ static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
 		break;
 	default:
 		dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd);
-		retval = -EINVAL;
+		return -EINVAL;
 		break;
 	}
 
-	spin_unlock(&chip->lock);
-
-	return retval;
+	return 0;
 }
 
 static snd_pcm_uframes_t
@@ -358,30 +355,29 @@ static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id)
 	int next_period;
 	int retval = IRQ_NONE;
 
-	spin_lock(&chip->lock);
+	scoped_guard(spinlock, &chip->lock) {
+		block_size = frames_to_bytes(runtime, runtime->period_size);
+		status = ssc_readl(chip->ssc->regs, IMR);
 
-	block_size = frames_to_bytes(runtime, runtime->period_size);
-	status = ssc_readl(chip->ssc->regs, IMR);
-
-	if (status & SSC_BIT(IMR_ENDTX)) {
-		chip->period++;
-		if (chip->period == runtime->periods)
-			chip->period = 0;
-		next_period = chip->period + 1;
-		if (next_period == runtime->periods)
-			next_period = 0;
-
-		offset = block_size * next_period;
-
-		ssc_writel(chip->ssc->regs, PDC_TNPR,
-				(long)runtime->dma_addr + offset);
-		ssc_writel(chip->ssc->regs, PDC_TNCR,
-				runtime->period_size * runtime->channels);
-		retval = IRQ_HANDLED;
-	}
+		if (status & SSC_BIT(IMR_ENDTX)) {
+			chip->period++;
+			if (chip->period == runtime->periods)
+				chip->period = 0;
+			next_period = chip->period + 1;
+			if (next_period == runtime->periods)
+				next_period = 0;
+
+			offset = block_size * next_period;
 
-	ssc_readl(chip->ssc->regs, IMR);
-	spin_unlock(&chip->lock);
+			ssc_writel(chip->ssc->regs, PDC_TNPR,
+				   (long)runtime->dma_addr + offset);
+			ssc_writel(chip->ssc->regs, PDC_TNCR,
+				   runtime->period_size * runtime->channels);
+			retval = IRQ_HANDLED;
+		}
+
+		ssc_readl(chip->ssc->regs, IMR);
+	}
 
 	if (status & SSC_BIT(IMR_ENDTX))
 		snd_pcm_period_elapsed(chip->substream);