[PATCH] libnvdimm, btt: fix btt_rw_page not returning errors

[Vishal Verma]

btt_rw_page was not propagating errors frm btt_do_bvec, resulting in any
IO errors via the rw_page path going unnoticed. the pmem driver recently
fixed this in e10624f pmem: fail io-requests to known bad blocks
but same problem in BTT went neglected.

Fixes: 5212e11 nd_btt: atomic sector updates
Cc: <sta...@vger.kernel.org>
Cc: Toshi Kani <toshi.k...@hpe.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Jeff Moyer <jmo...@redhat.com>
Signed-off-by: Vishal Verma <vishal.l.ve...@intel.com>
---
 drivers/nvdimm/btt.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 7ca11df..4e56e72 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1248,10 +1248,13 @@ static int btt_rw_page(struct block_device *bdev, 
sector_t sector,
                struct page *page, bool is_write)
 {
        struct btt *btt = bdev->bd_disk->private_data;
+       int rc;
 
-       btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, is_write, sector);
-       page_endio(page, is_write, 0);
-       return 0;
+       rc = btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, is_write, sector);
+       if (rc == 0)
+               page_endio(page, is_write, 0);
+
+       return rc;
 }
 
 
-- 
2.9.3