diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 0abdf939a58c..33d8c08e564f 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -1875,10 +1875,10 @@ void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
 	if (substream->timer_running)
 		snd_timer_interrupt(substream->timer, 1);
  _end:
+	kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
 	snd_pcm_stream_unlock_irqrestore(substream, flags);
 	if (runtime->transfer_ack_end)
 		runtime->transfer_ack_end(substream);
-	kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
 }
 
 EXPORT_SYMBOL(snd_pcm_period_elapsed);