dm writecache: remove needless dereferences in __writecache_writeback_pmem()

bio is already available so there is no need to access it in terms of
the wb pointer.

Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index f782287..5b4d1c1 100644 (file)
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -1478,9 +1478,9 @@ static void __writecache_writeback_pmem(struct dm_writecache *wc, struct writeba
                bio = bio_alloc_bioset(GFP_NOIO, max_pages, &wc->bio_set);
                wb = container_of(bio, struct writeback_struct, bio);
                wb->wc = wc;
-               wb->bio.bi_end_io = writecache_writeback_endio;
-               bio_set_dev(&wb->bio, wc->dev->bdev);
-               wb->bio.bi_iter.bi_sector = read_original_sector(wc, e);
+               bio->bi_end_io = writecache_writeback_endio;
+               bio_set_dev(bio, wc->dev->bdev);
+               bio->bi_iter.bi_sector = read_original_sector(wc, e);
                wb->page_offset = PAGE_SIZE;
                if (max_pages <= WB_LIST_INLINE ||
                    unlikely(!(wb->wc_list = kmalloc_array(max_pages, sizeof(struct wc_entry *),
@@ -1507,12 +1507,12 @@ static void __writecache_writeback_pmem(struct dm_writecache *wc, struct writeba
                        wb->wc_list[wb->wc_list_n++] = f;
                        e = f;
                }
-               bio_set_op_attrs(&wb->bio, REQ_OP_WRITE, WC_MODE_FUA(wc) * REQ_FUA);
+               bio_set_op_attrs(bio, REQ_OP_WRITE, WC_MODE_FUA(wc) * REQ_FUA);
                if (writecache_has_error(wc)) {
                        bio->bi_status = BLK_STS_IOERR;
-                       bio_endio(&wb->bio);
+                       bio_endio(bio);
                } else {
-                       submit_bio(&wb->bio);
+                       submit_bio(bio);
                }
 
                __writeback_throttle(wc, wbl);