[PATCH] device-mapper snapshot: bio_list fix

bio_list_merge() should do nothing if the second list is empty - not oops. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
git-mirror · Nov 22, 2005 · 233886d · 233886d
1 parent 640eb3b
commit 233886d
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/md/dm-bio-list.h b/drivers/md/dm-bio-list.h
@@ -33,6 +33,9 @@ static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
 
 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