The cost is 128bytes(8*16) stack space in kernel thread context, and
just use the bio helper to retrieve pages from bio.

Signed-off-by: Ming Lei <tom.leim...@gmail.com>
---
 drivers/md/raid10.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 5016ce8163c3..d9d7c79a3bd4 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4689,7 +4689,15 @@ static int handle_reshape_read_error(struct mddev *mddev,
        struct r10bio *r10b = &on_stack.r10_bio;
        int slot = 0;
        int idx = 0;
-       struct bio_vec *bvec = r10_bio->master_bio->bi_io_vec;
+       struct bio_vec *bvl;
+       struct page *pages[RESYNC_PAGES];
+
+       /*
+        * This bio is allocated in reshape_request(), and size
+        * is still RESYNC_PAGES
+        */
+       bio_for_each_segment_all(bvl, r10_bio->master_bio, idx)
+               pages[idx] = bvl->bv_page;
 
        r10b->sector = r10_bio->sector;
        __raid10_find_phys(&conf->prev, r10b);
@@ -4718,7 +4726,7 @@ static int handle_reshape_read_error(struct mddev *mddev,
                        success = sync_page_io(rdev,
                                               addr,
                                               s << 9,
-                                              bvec[idx].bv_page,
+                                              pages[idx],
                                               REQ_OP_READ, 0, false);
                        rdev_dec_pending(rdev, mddev);
                        rcu_read_lock();
-- 
2.7.4

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