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 | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 69fe2a3cef89..c7d2f73565d9 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2184,6 +2184,11 @@ static void fix_recovery_read_error(struct r10bio 
*r10_bio)
        int idx = 0;
        int dr = r10_bio->devs[0].devnum;
        int dw = r10_bio->devs[1].devnum;
+       struct bio_vec *bvl;
+       struct page *pages[RESYNC_PAGES];
+
+       bio_for_each_segment_all(bvl, bio, idx)
+               pages[idx] = bvl->bv_page;
 
        while (sectors) {
                int s = sectors;
@@ -2199,7 +2204,7 @@ static void fix_recovery_read_error(struct r10bio 
*r10_bio)
                ok = sync_page_io(rdev,
                                  addr,
                                  s << 9,
-                                 bio->bi_io_vec[idx].bv_page,
+                                 pages[idx],
                                  REQ_OP_READ, 0, false);
                if (ok) {
                        rdev = conf->mirrors[dw].rdev;
@@ -2207,7 +2212,7 @@ static void fix_recovery_read_error(struct r10bio 
*r10_bio)
                        ok = sync_page_io(rdev,
                                          addr,
                                          s << 9,
-                                         bio->bi_io_vec[idx].bv_page,
+                                         pages[idx],
                                          REQ_OP_WRITE, 0, false);
                        if (!ok) {
                                set_bit(WriteErrorSeen, &rdev->flags);
-- 
2.7.4

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