[CRYPTO] cipher: Removed special IV checks for ECB

This patch makes IV operations on ECB fail through nocrypt_iv rather than
calling BUG().  This is needed to generalise CBC/ECB using the template
mechanism.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/cipher.c

@@ -399,6 +399,8 @@ int crypto_init_cipher_ops(struct crypto_tfm *tfm)
 	case CRYPTO_TFM_MODE_ECB:
 		ops->cit_encrypt = ecb_encrypt;
 		ops->cit_decrypt = ecb_decrypt;
+		ops->cit_encrypt_iv = nocrypt_iv;
+		ops->cit_decrypt_iv = nocrypt_iv;
 		break;
 		
 	case CRYPTO_TFM_MODE_CBC:

include/linux/crypto.h

@@ -422,7 +422,6 @@ static inline int crypto_cipher_encrypt_iv(struct crypto_tfm *tfm,
                                            unsigned int nbytes, u8 *iv)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
-	BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
 	return tfm->crt_cipher.cit_encrypt_iv(tfm, dst, src, nbytes, iv);
 }                                        
 
@@ -441,7 +440,6 @@ static inline int crypto_cipher_decrypt_iv(struct crypto_tfm *tfm,
                                            unsigned int nbytes, u8 *iv)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
-	BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
 	return tfm->crt_cipher.cit_decrypt_iv(tfm, dst, src, nbytes, iv);
 }