while (sect_to_write) {
                struct bio *wbio;
+               sector_t wsector;
                if (sectors > sect_to_write)
                        sectors = sect_to_write;
                /* Write at 'sector' for 'sectors' */
                wbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
                bio_trim(wbio, sector - bio->bi_iter.bi_sector, sectors);
-               wbio->bi_iter.bi_sector = (r10_bio->devs[i].addr+
-                                  choose_data_offset(r10_bio, rdev) +
-                                  (sector - r10_bio->sector));
+               wsector = r10_bio->devs[i].addr + (sector - r10_bio->sector);
+               wbio->bi_iter.bi_sector = wsector +
+                                  choose_data_offset(r10_bio, rdev);
                wbio->bi_bdev = rdev->bdev;
                bio_set_op_attrs(wbio, REQ_OP_WRITE, 0);
 
                if (submit_bio_wait(wbio) < 0)
                        /* Failure! */
-                       ok = rdev_set_badblocks(rdev, sector,
+                       ok = rdev_set_badblocks(rdev, wsector,
                                                sectors, 0)
                                && ok;