block: make blk_rq_map_user() clear ->bio if it unmaps it

That way the interface is symmetric, and calling blk_rq_unmap_user()
on the request wont oops.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/block/blk-map.c b/block/blk-map.c
index 955d75c1a58f..bc5ce60691c3 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -143,6 +143,7 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
 	return 0;
 unmap_rq:
 	blk_rq_unmap_user(bio);
+	rq->bio = NULL;
 	return ret;
 }
 EXPORT_SYMBOL(blk_rq_map_user);