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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 <samitolvanen@google.com>
Fixes: a739ff3f54 ("dm verity: add support for forward error correction")
Cc: stable@vger.kernel.org # v4.5+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Sami Tolvanen 2016-06-21 11:02:42 -07:00 committed by Mike Snitzer
parent 028b39e314
commit 602d1657c6
1 changed files with 1 additions and 3 deletions
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4
drivers/md/dm-verity-fec.c
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@ -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