blk_rq_map_user(): use import_single_range()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/block/blk-map.c b/block/blk-map.c
index b8d2725324a6b88391db4c8a5daf7a9c1309dd86..da310a1054299720d1b809d4ac3fd27af02b1e19 100644 (file)
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -124,10 +124,10 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
 {
        struct iovec iov;
        struct iov_iter i;
+       int ret = import_single_range(rq_data_dir(rq), ubuf, len, &iov, &i);
 
-       iov.iov_base = ubuf;
-       iov.iov_len = len;
-       iov_iter_init(&i, rq_data_dir(rq), &iov, 1, len);
+       if (unlikely(ret < 0))
+               return ret;
 
        return blk_rq_map_user_iov(q, rq, map_data, &i, gfp_mask);
 }