crypto: talitos - move to generic async completion

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@benyossef.com>
Tested-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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;