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>
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@ -453,9 +453,7 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io,
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*/
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offset = block << v->data_dev_block_bits;
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res = offset;
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div64_u64(res, v->fec->rounds << v->data_dev_block_bits);
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res = div64_u64(offset, v->fec->rounds << v->data_dev_block_bits);
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/*
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* The base RS block we can feed to the interleaver to find out all
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