sound/wavefront_synth: insert

Hi,

Please consider applying.

Description: Insert set_current_state() before schedule_timeout(). Without the insertion, schedule_timeout() returns immediately, resulting in an effective busy-wait.

@@ -1751,6 +1751,7 @@ wavefront_should_cause_interrupt (snd_wa
 	outb (val,port);
 	spin_unlock_irq(&dev->irq_lock);
 	while (1) {
+		set_current_state(TASK_INTERRUPTIBLE);
 		if ((timeout = schedule_timeout(timeout)) == 0)
 			return;
 		if (dev->irq_ok)

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