nvdimm-blk: use bvec_kmap_local in nd_blk_rw_integrity

Using local kmaps slightly reduces the chances to stray writes, and
the bvec interface cleans up the code a little bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20220303111905.321089-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index c1db435..0a38738 100644 (file)
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -88,10 +88,9 @@ static int nd_blk_rw_integrity(struct nd_namespace_blk *nsblk,
                 */
 
                cur_len = min(len, bv.bv_len);
-               iobuf = kmap_atomic(bv.bv_page);
-               err = ndbr->do_io(ndbr, dev_offset, iobuf + bv.bv_offset,
-                               cur_len, rw);
-               kunmap_atomic(iobuf);
+               iobuf = bvec_kmap_local(&bv);
+               err = ndbr->do_io(ndbr, dev_offset, iobuf, cur_len, rw);
+               kunmap_local(iobuf);
                if (err)
                        return err;