Hi Daniel,
> 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.
Thanks! Not sure how I screwed that up.
Acked-by: Anton Blanchard <anton@xxxxxxxxx>
> Fixes: 6dd7a82cc54e ("crypto: powerpc - Add POWER8 optimised crc32c")
> Cc: Anton Blanchard <anton@xxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Daniel Axtens <dja@xxxxxxxxxx>
> ---
> arch/powerpc/crypto/crc32c-vpmsum_glue.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/crypto/crc32c-vpmsum_glue.c
> b/arch/powerpc/crypto/crc32c-vpmsum_glue.c index
> 9fa046d56eba..411994551afc 100644 ---
> a/arch/powerpc/crypto/crc32c-vpmsum_glue.c +++
> b/arch/powerpc/crypto/crc32c-vpmsum_glue.c @@ -52,7 +52,7 @@ static
> int crc32c_vpmsum_cra_init(struct crypto_tfm *tfm) {
> u32 *key = crypto_tfm_ctx(tfm);
>
> - *key = 0;
> + *key = ~0;
>
> return 0;
> }
