diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 5143801..180261d 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -976,9 +976,9 @@
 	struct snd_rawmidi_runtime *runtime = substream->runtime;
 	unsigned long appl_ptr;
 
-	spin_lock_irqsave(&runtime->lock, flags);
 	if (userbuf)
 		mutex_lock(&runtime->realloc_mutex);
+	spin_lock_irqsave(&runtime->lock, flags);
 	while (count > 0 && runtime->avail) {
 		count1 = runtime->buffer_size - runtime->appl_ptr;
 		if (count1 > count)