[PATCH] dm-verity: pass correct bytes to verity_use_bh

[LongPing Wei]

bi_size is always 0 here since the iterator was already advanced.

Fixes: 8cf3ae875ee4 ("dm-verity: support block number limits for different 
ioprio classes")
Signed-off-by: LongPing Wei <weilongp...@oppo.com>
---
 drivers/md/dm-verity-target.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index 2ed10b4c63c5..40448a8c74b1 100644
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -689,6 +689,7 @@ static void verity_end_io(struct bio *bio)
 {
        struct dm_verity_io *io = bio->bi_private;
        unsigned short ioprio = IOPRIO_PRIO_CLASS(bio->bi_ioprio);
+       unsigned int bytes = io->n_blocks << io->v->data_dev_block_bits;
 
        if (bio->bi_status &&
            (!verity_fec_is_enabled(io->v) ||
@@ -699,7 +700,7 @@ static void verity_end_io(struct bio *bio)
        }
 
        if (static_branch_unlikely(&use_bh_wq_enabled) && io->v->use_bh_wq &&
-               verity_use_bh(bio->bi_iter.bi_size, ioprio)) {
+               verity_use_bh(bytes, ioprio)) {
                if (in_hardirq() || irqs_disabled()) {
                        INIT_WORK(&io->bh_work, verity_bh_work);
                        queue_work(system_bh_wq, &io->bh_work);
-- 
2.34.1