OMAP: ASoC: Fix spinlock misuse in omap-pcm.c

omap_pcm_trigger is called also in interrupt context so CPU flags must
be restored when returning.

Signed-off-by: Eero Nurkkala <[e-mail]>
Acked-by: Jarkko Nikula <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/omap/omap-pcm.c

···
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct omap_runtime_data *prtd = runtime->private_data;
+	unsigned long flags;
 	int ret = 0;
 
-	spin_lock_irq(&prtd->lock);
+	spin_lock_irqsave(&prtd->lock, flags);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
···
 	default:
 		ret = -EINVAL;
 	}
-	spin_unlock_irq(&prtd->lock);
+	spin_unlock_irqrestore(&prtd->lock, flags);
 
 	return ret;
 }