diff -ru linux/drivers/sound/sb_mixer.c linux-matze/drivers/sound/sb_mixer.c
--- linux/drivers/sound/sb_mixer.c	Mon Sep 17 23:36:38 2001
+++ linux-matze/drivers/sound/sb_mixer.c	Tue Sep 18 00:39:47 2001
@@ -748,6 +748,9 @@
 
 void sb_mixer_unload(sb_devc *devc)
 {
+	if (devc->my_mixerdev == -1)
+		return;
+
 	kfree(mixer_devs[devc->my_mixerdev]);
 	sound_unload_mixerdev(devc->my_mixerdev);
 	sbmixnum--;