1 files changed, 6 insertions, 5 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 5a4d39b4686b..bba550826921 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -216,9 +216,9 @@ static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter,
 }
 
 #define for_each_bvec(bvl, bio_vec, iter, start)                        \
-        for ((iter) = start;                                            \
-             (bvl) = bvec_iter_bvec((bio_vec), (iter)),                 \
-                (iter).bi_size;                                         \
+        for (iter = (start);                                            \
+             (iter).bi_size &&                                          \
+                ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \
              bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len))
 
 
@@ -388,7 +388,7 @@ struct sg_iovec;
 struct rq_map_data;
 extern struct bio *bio_map_user_iov(struct request_queue *,
                                     struct block_device *,
-                                    struct sg_iovec *, int, int, gfp_t);
+                                    const struct sg_iovec *, int, int, gfp_t);
 extern void bio_unmap_user(struct bio *);
 extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
                                 gfp_t);
@@ -414,7 +414,8 @@ extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
 extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
                                  unsigned long, unsigned int, int, gfp_t);
 extern struct bio *bio_copy_user_iov(struct request_queue *,
-                                     struct rq_map_data *, struct sg_iovec *,
+                                     struct rq_map_data *,
+                                     const struct sg_iovec *,
                                      int, int, gfp_t);
 extern int bio_uncopy_user(struct bio *);
 void zero_fill_bio(struct bio *bio);