From: Sergey Senozhatsky Subject: Re: [PATCH v2 4/8] crypto/lz4hc: support decompress_noctx Date: Thu, 27 Aug 2015 10:57:30 +0900 Message-ID: <20150827015730.GC1545@swordfish> References: <1440052504-15442-1-git-send-email-iamjoonsoo.kim@lge.com> <1440052504-15442-5-git-send-email-iamjoonsoo.kim@lge.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andrew Morton , Minchan Kim , Nitin Gupta , Sergey Senozhatsky , linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, Herbert Xu , "David S. Miller" , Stephan Mueller , Joonsoo Kim To: Joonsoo Kim Return-path: Content-Disposition: inline In-Reply-To: <1440052504-15442-5-git-send-email-iamjoonsoo.kim@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org On (08/20/15 15:35), Joonsoo Kim wrote: > > lz4hc's decompression doesn't requires any scratch buffer so > it doesn't need tfm context. Hence, it can support > crypto compression noctx API and this patch implements it. > > Signed-off-by: Joonsoo Kim > --- > crypto/lz4hc.c | 17 ++++++++++++++++- > 1 file changed, 16 insertions(+), 1 deletion(-) > > diff --git a/crypto/lz4hc.c b/crypto/lz4hc.c > index bcf0baa..a529620 100644 > --- a/crypto/lz4hc.c > +++ b/crypto/lz4hc.c > @@ -76,6 +76,21 @@ static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src, > return err; > } > > +static int lz4hc_decompress_noctx(const u8 *src, unsigned int slen, > + u8 *dst, unsigned int *dlen) > +{ > + int err; > + size_t tmp_len = *dlen; > + size_t __slen = slen; > + > + err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len); > + if (err < 0) > + return -EINVAL; > + > + *dlen = tmp_len; > + return err; > +} > + same, static int lz4hc_decompress_noctx(const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) { return lz4hc_decompress_crypto(NULL, ....); } ? -ss > static struct crypto_alg alg_lz4hc = { > .cra_name = "lz4hc", > .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, > @@ -88,7 +103,7 @@ static struct crypto_alg alg_lz4hc = { > .coa_compress = lz4hc_compress_crypto, > .coa_decompress = lz4hc_decompress_crypto, > .coa_compress_noctx = NULL, > - .coa_decompress_noctx = NULL } } > + .coa_decompress_noctx = lz4hc_decompress_noctx } } > }; > > static int __init lz4hc_mod_init(void) > -- > 1.9.1 >