linux-kernel - [PATCH v10 08/20] crypto: move pub key to generic async completion

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Date:   Wed, 18 Oct 2017 08:00:40 +0100
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     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: [PATCH v10 08/20] crypto: move pub key to generic async completion

public_key_verify_signature() is starting an async crypto op and
waiting for it to complete. Move it over to generic code doing
the same.

Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
---
 crypto/asymmetric_keys/public_key.c | 28 ++++------------------------
 1 file changed, 4 insertions(+), 24 deletions(-)

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index 3cd6e12..d916235 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -57,29 +57,13 @@ static void public_key_destroy(void *payload0, void *payload3)
 	public_key_signature_free(payload3);
 }
 
-struct public_key_completion {
-	struct completion completion;
-	int err;
-};
-
-static void public_key_verify_done(struct crypto_async_request *req, int err)
-{
-	struct public_key_completion *compl = req->data;
-
-	if (err == -EINPROGRESS)
-		return;
-
-	compl->err = err;
-	complete(&compl->completion);
-}
-
 /*
  * Verify a signature using a public key.
  */
 int public_key_verify_signature(const struct public_key *pkey,
 				const struct public_key_signature *sig)
 {
-	struct public_key_completion compl;
+	struct crypto_wait cwait;
 	struct crypto_akcipher *tfm;
 	struct akcipher_request *req;
 	struct scatterlist sig_sg, digest_sg;
@@ -131,20 +115,16 @@ int public_key_verify_signature(const struct public_key *pkey,
 	sg_init_one(&digest_sg, output, outlen);
 	akcipher_request_set_crypt(req, &sig_sg, &digest_sg, sig->s_size,
 				   outlen);
-	init_completion(&compl.completion);
+	crypto_init_wait(&cwait);
 	akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
 				      CRYPTO_TFM_REQ_MAY_SLEEP,
-				      public_key_verify_done, &compl);
+				      crypto_req_done, &cwait);
 
 	/* Perform the verification calculation.  This doesn't actually do the
 	 * verification, but rather calculates the hash expected by the
 	 * signature and returns that to us.
 	 */
-	ret = crypto_akcipher_verify(req);
-	if ((ret == -EINPROGRESS) || (ret == -EBUSY)) {
-		wait_for_completion(&compl.completion);
-		ret = compl.err;
-	}
+	ret = crypto_wait_req(crypto_akcipher_verify(req), &cwait);
 	if (ret < 0)
 		goto out_free_output;
 
-- 
2.7.4