PATCH: fix a race in the plugin api for ac97

[Alan Cox]

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.22-pre5/drivers/sound/ac97_codec.c linux.22-pre5-ac1/drivers/sound/ac97_codec.c
--- linux.22-pre5/drivers/sound/ac97_codec.c	2003-07-14 12:27:39.000000000 +0100
+++ linux.22-pre5-ac1/drivers/sound/ac97_codec.c	2003-07-07 16:20:20.000000000 +0100
@@ -740,7 +740,6 @@
 	memset(codec, 0, sizeof(*codec));
 	spin_lock_init(&codec->lock);
 	INIT_LIST_HEAD(&codec->list);
-	list_add(&codec->list, &codecs);
 	return codec;
 }
 
@@ -869,6 +868,7 @@
 	 */
 	 
 	down(&codec_sem);
+	list_add(&codec->list, &codecs);
 
 	list_for_each(l, &codec_drivers) {
 		d = list_entry(l, struct ac97_driver, list);