do_div was replaced with div64_u64 at some point, causing a bug
with block calculation due to incompatible semantics of the two
functions.
Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Fixes: a739ff3f543a ("dm verity: add support for forward error correction")
---
drivers/md/dm-verity-fec.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c
index 459a9f8..0f0eb8a 100644
--- a/drivers/md/dm-verity-fec.c
+++ b/drivers/md/dm-verity-fec.c
@@ -453,9 +453,7 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io,
*/
offset = block << v->data_dev_block_bits;
-
- res = offset;
- div64_u64(res, v->fec->rounds << v->data_dev_block_bits);
+ res = div64_u64(offset, v->fec->rounds << v->data_dev_block_bits);
/*
* The base RS block we can feed to the interleaver to find out all
--
2.8.0.rc3.226.g39d4020
--
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