[PATCH] device-mapper snapshot: bio_list fix

[Alasdair G Kergon]

bio_list_merge() should do nothing if the second list is empty - not oops.

From: jblunck@xxxxxxx
Signed-Off-By: Alasdair G Kergon <agk@xxxxxxxxxx>

Index: linux-2.6.14/drivers/md/dm-bio-list.h
===================================================================
--- linux-2.6.14.orig/drivers/md/dm-bio-list.h	2005-10-28 01:02:08.000000000 +0100
+++ linux-2.6.14/drivers/md/dm-bio-list.h	2005-11-15 15:59:20.000000000 +0000
@@ -33,6 +33,9 @@ static inline void bio_list_add(struct b
 
 static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
 {
+	if (!bl2->head)
+		return;
+
 	if (bl->tail)
 		bl->tail->bi_next = bl2->head;
 	else
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/