linux-kernel - Re: [PATCH v9 17/20] crypto: talitos: move to generic async completion

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Date:   Tue, 17 Oct 2017 12:50:41 +0200
From:   Christophe LEROY <christophe.leroy@....fr>
To:     Gilad Ben-Yossef <gilad@...yossef.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        David Howells <dhowells@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Gary Hook <gary.hook@....com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Arnaud Ebalard <arno@...isbad.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Steve French <sfrench@...ba.org>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc:     Ofir Drang <ofir.drang@....com>, linux-crypto@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-fscrypt@...r.kernel.org,
        netdev@...r.kernel.org, linux-ima-devel@...ts.sourceforge.net,
        linux-ima-user@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v9 17/20] crypto: talitos: move to generic async
 completion

Le 15/10/2017 à 11:20, Gilad Ben-Yossef a écrit :
> The talitos driver starts several async crypto ops and  waits for their
> completions. Move it over to generic code doing the same.
> 
> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>

Tested-by: Christophe Leroy <christophe.leroy@....fr>

> ---
>   drivers/crypto/talitos.c | 38 +++++---------------------------------
>   1 file changed, 5 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
> index 5bd8191..9c80e0c 100644
> --- a/drivers/crypto/talitos.c
> +++ b/drivers/crypto/talitos.c
> @@ -2160,22 +2160,6 @@ static int ahash_import(struct ahash_request *areq, const void *in)
>   	return 0;
>   }
>   
> -struct keyhash_result {
> -	struct completion completion;
> -	int err;
> -};
> -
> -static void keyhash_complete(struct crypto_async_request *req, int err)
> -{
> -	struct keyhash_result *res = req->data;
> -
> -	if (err == -EINPROGRESS)
> -		return;
> -
> -	res->err = err;
> -	complete(&res->completion);
> -}
> -
>   static int keyhash(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen,
>   		   u8 *hash)
>   {
> @@ -2183,10 +2167,10 @@ static int keyhash(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen,
>   
>   	struct scatterlist sg[1];
>   	struct ahash_request *req;
> -	struct keyhash_result hresult;
> +	struct crypto_wait wait;
>   	int ret;
>   
> -	init_completion(&hresult.completion);
> +	crypto_init_wait(&wait);
>   
>   	req = ahash_request_alloc(tfm, GFP_KERNEL);
>   	if (!req)
> @@ -2195,25 +2179,13 @@ static int keyhash(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen,
>   	/* Keep tfm keylen == 0 during hash of the long key */
>   	ctx->keylen = 0;
>   	ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
> -				   keyhash_complete, &hresult);
> +				   crypto_req_done, &wait);
>   
>   	sg_init_one(&sg[0], key, keylen);
>   
>   	ahash_request_set_crypt(req, sg, hash, keylen);
> -	ret = crypto_ahash_digest(req);
> -	switch (ret) {
> -	case 0:
> -		break;
> -	case -EINPROGRESS:
> -	case -EBUSY:
> -		ret = wait_for_completion_interruptible(
> -			&hresult.completion);
> -		if (!ret)
> -			ret = hresult.err;
> -		break;
> -	default:
> -		break;
> -	}
> +	ret = crypto_wait_req(crypto_ahash_digest(req), &wait);
> +
>   	ahash_request_free(req);
>   
>   	return ret;
>