crypto: powerpc - Fix initialisation of crc32c context
authorDaniel Axtens <dja@axtens.net>
Fri, 3 Mar 2017 06:56:55 +0000 (17:56 +1100)
committerHerbert Xu <herbert@gondor.apana.org.au>
Wed, 8 Mar 2017 06:01:08 +0000 (14:01 +0800)
commitaa2be9b3d6d2d699e9ca7cbfc00867c80e5da213
treeea6b7359f59fed7a763df730a96f2a6cca95db14
parentc1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201
crypto: powerpc - Fix initialisation of crc32c context

Turning on crypto self-tests on a POWER8 shows:

    alg: hash: Test 1 failed for crc32c-vpmsum
    00000000: ff ff ff ff

Comparing the code with the Intel CRC32c implementation on which
ours is based shows that we are doing an init with 0, not ~0
as CRC32c requires.

This probably wasn't caught because btrfs does its own weird
open-coded initialisation.

Initialise our internal context to ~0 on init.

This makes the self-tests pass, and btrfs continues to work.

Fixes: 6dd7a82cc54e ("crypto: powerpc - Add POWER8 optimised crc32c")
Cc: Anton Blanchard <anton@samba.org>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Axtens <dja@axtens.net>
Acked-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
arch/powerpc/crypto/crc32c-vpmsum_glue.c