crypto: crypto4xx - use sync skcipher for fallback

This replaces struct crypto_skcipher and the extra request size
with struct crypto_sync_skcipher and SYNC_SKCIPHER_REQUEST_ON_STACK(),
which uses a fixed stack size.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/amcc/crypto4xx_alg.c

@@ -264,10 +264,10 @@ crypto4xx_ctr_crypt(struct skcipher_request *req, bool encrypt)
 	 * overlow.
 	 */
 	if (counter + nblks < counter) {
-		struct skcipher_request *subreq = skcipher_request_ctx(req);
+		SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->sw_cipher.cipher);
 		int ret;
 
-		skcipher_request_set_tfm(subreq, ctx->sw_cipher.cipher);
+		skcipher_request_set_sync_tfm(subreq, ctx->sw_cipher.cipher);
 		skcipher_request_set_callback(subreq, req->base.flags,
 			NULL, NULL);
 		skcipher_request_set_crypt(subreq, req->src, req->dst,
@@ -289,14 +289,14 @@ static int crypto4xx_sk_setup_fallback(struct crypto4xx_ctx *ctx,
 {
 	int rc;
 
-	crypto_skcipher_clear_flags(ctx->sw_cipher.cipher,
+	crypto_sync_skcipher_clear_flags(ctx->sw_cipher.cipher,
 				    CRYPTO_TFM_REQ_MASK);
-	crypto_skcipher_set_flags(ctx->sw_cipher.cipher,
+	crypto_sync_skcipher_set_flags(ctx->sw_cipher.cipher,
 		crypto_skcipher_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
-	rc = crypto_skcipher_setkey(ctx->sw_cipher.cipher, key, keylen);
+	rc = crypto_sync_skcipher_setkey(ctx->sw_cipher.cipher, key, keylen);
 	crypto_skcipher_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
 	crypto_skcipher_set_flags(cipher,
-		crypto_skcipher_get_flags(ctx->sw_cipher.cipher) &
+		crypto_sync_skcipher_get_flags(ctx->sw_cipher.cipher) &
 			CRYPTO_TFM_RES_MASK);
 
 	return rc;

drivers/crypto/amcc/crypto4xx_core.c

@@ -965,15 +965,10 @@ static int crypto4xx_sk_init(struct crypto_skcipher *sk)
 
 	if (alg->base.cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
 		ctx->sw_cipher.cipher =
-			crypto_alloc_skcipher(alg->base.cra_name, 0,
-					      CRYPTO_ALG_NEED_FALLBACK |
-					      CRYPTO_ALG_ASYNC);
+			crypto_alloc_sync_skcipher(alg->base.cra_name, 0,
+					      CRYPTO_ALG_NEED_FALLBACK);
 		if (IS_ERR(ctx->sw_cipher.cipher))
 			return PTR_ERR(ctx->sw_cipher.cipher);
-
-		crypto_skcipher_set_reqsize(sk,
-			sizeof(struct skcipher_request) + 32 +
-			crypto_skcipher_reqsize(ctx->sw_cipher.cipher));
 	}
 
 	amcc_alg = container_of(alg, struct crypto4xx_alg, alg.u.cipher);
@@ -992,7 +987,7 @@ static void crypto4xx_sk_exit(struct crypto_skcipher *sk)
 
 	crypto4xx_common_exit(ctx);
 	if (ctx->sw_cipher.cipher)
-		crypto_free_skcipher(ctx->sw_cipher.cipher);
+		crypto_free_sync_skcipher(ctx->sw_cipher.cipher);
 }
 
 static int crypto4xx_aead_init(struct crypto_aead *tfm)

drivers/crypto/amcc/crypto4xx_core.h

@@ -131,7 +131,7 @@ struct crypto4xx_ctx {
 	__le32 iv_nonce;
 	u32 sa_len;
 	union {
-		struct crypto_skcipher *cipher;
+		struct crypto_sync_skcipher *cipher;
 		struct crypto_aead *aead;
 	} sw_cipher;
 };