--- zzzz-none-000/linux-3.10.107/sound/core/sgbuf.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/sound/core/sgbuf.c	2021-02-04 17:41:59.000000000 +0000
@@ -39,8 +39,7 @@
 	if (! sgbuf)
 		return -EINVAL;
 
-	if (dmab->area)
-		vunmap(dmab->area);
+	vunmap(dmab->area);
 	dmab->area = NULL;
 
 	tmpb.dev.type = SNDRV_DMA_TYPE_DEV;