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crypto: 842 - change 842 alg to use software

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Change the crypto 842 compression alg to use the software 842 compression
and decompression library.  Add the crypto driver_name as "842-generic".
Remove the fallback to LZO compression.

Previously, this crypto compression alg attemped 842 compression using
PowerPC hardware, and fell back to LZO compression and decompression if
the 842 PowerPC hardware was unavailable or failed.  This should not
fall back to any other compression method, however; users of this crypto
compression alg can fallback if desired, and transparent fallback tricks
callers into thinking they are getting 842 compression when they actually
get LZO compression - the failure of the 842 hardware should not be
transparent to the caller.

The crypto compression alg for a hardware device also should not be located
in crypto/ so this is now a software-only implementation that uses the 842
software compression/decompression library.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Dan Streetman
2015-05-07 13:49:15 -04:00
committed by Herbert Xu
parent 2da572c959
commit 2062c5b6da
3 changed files with 41 additions and 141 deletions
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7
crypto/Kconfig
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@@ -1412,10 +1412,9 @@ config CRYPTO_LZO
config CRYPTO_842
tristate "842 compression algorithm"
depends on CRYPTO_DEV_NX_COMPRESS
# 842 uses lzo if the hardware becomes unavailable
select LZO_COMPRESS
select LZO_DECOMPRESS
select CRYPTO_ALGAPI
select 842_COMPRESS
select 842_DECOMPRESS
help
This is the 842 algorithm.