[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>
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@ -33,6 +33,9 @@ static inline void bio_list_add(struct bio_list *bl, struct bio *bio)
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static inline void bio_list_merge(struct bio_list *bl, struct bio_list *bl2)
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{
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if (!bl2->head)
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return;
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if (bl->tail)
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bl->tail->bi_next = bl2->head;
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else
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