From: Sami Tolvanen Date: Tue, 21 Jun 2016 18:02:42 +0000 (-0700) Subject: dm verity fec: fix block calculation X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=602d1657c603eedd7379a8bcde1ad3a2972ecc5f;p=linux-beck.git dm verity fec: fix block calculation 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 Fixes: a739ff3f543a ("dm verity: add support for forward error correction") Cc: stable@vger.kernel.org # v4.5+ Signed-off-by: Mike Snitzer --- diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c index 459a9f8905ed..0f0eb8a3d922 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