Add a standard bit of list safety. The other functions called in
blk_rq_append_bio() are written to assume only a single bio is passed to
them. Therefore, it is an error to _ever_ pass a list to this function.
Enforce this error by ensuring the bio list is guaranteed to only append
a single list item with each blk_rq_append_bio() call.
Signed-off-by: Jeff Garzik <jgarzik@xxxxxxxxxx>
diff --git a/block/blk-map.c b/block/blk-map.c
index f103729..a7eeac4 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -19,6 +19,7 @@ int blk_rq_append_bio(struct request_queue *q, struct request *rq,
else {
rq->biotail->bi_next = bio;
rq->biotail = bio;
+ bio->bi_next = NULL;
rq->data_len += bio->bi_size;
}
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