linux-kernel - [RFC PATCH] crypto: brcm - explicitly cast cipher to hash type

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Date:   Sat, 24 Mar 2018 12:02:42 +0100
From:   Stefan Agner <stefan@...er.ch>
To:     herbert@...dor.apana.org.au, davem@...emloft.net,
        raveendra.padasalagi@...adcom.com, clabbe.montjoie@...il.com
Cc:     scott.branden@...adcom.com, steven.lin1@...adcom.com,
        garsilva@...eddedor.com, pravin.shedge4linux@...il.com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stefan Agner <stefan@...er.ch>
Subject: [RFC PATCH] crypto: brcm - explicitly cast cipher to hash type

In the AES cases enum spu_cipher_type and enum hash_type have
the same values, so the assignment is fine. Explicitly cast
the enum type conversion.

This fixes two warnings when building with clang:
  drivers/crypto/bcm/cipher.c:821:34: warning: implicit conversion from
      enumeration type 'enum spu_cipher_type' to different enumeration
      type 'enum hash_type' [-Wenum-conversion]
                hash_parms.type = cipher_parms.type;
                                ~ ~~~~~~~~~~~~~^~~~
  drivers/crypto/bcm/cipher.c:1412:26: warning: implicit conversion from
      enumeration type 'enum spu_cipher_type' to different enumeration
      type 'enum hash_type' [-Wenum-conversion]
                hash_parms.type = ctx->cipher_type;
                                ~ ~~~~~^~~~~~~~~~~

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
I am not familar with the IP... I would be glad if somebody with
better insight could have a look whether that patch makes sense.

 drivers/crypto/bcm/cipher.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/bcm/cipher.c b/drivers/crypto/bcm/cipher.c
index 2b75f95bbe1b..309c67c7012f 100644
--- a/drivers/crypto/bcm/cipher.c
+++ b/drivers/crypto/bcm/cipher.c
@@ -818,7 +818,7 @@ static int handle_ahash_req(struct iproc_reqctx_s *rctx)
 
 	/* AES hashing keeps key size in type field, so need to copy it here */
 	if (hash_parms.alg == HASH_ALG_AES)
-		hash_parms.type = cipher_parms.type;
+		hash_parms.type = (enum hash_type)cipher_parms.type;
 	else
 		hash_parms.type = spu->spu_hash_type(rctx->total_sent);
 
@@ -1409,7 +1409,7 @@ static int handle_aead_req(struct iproc_reqctx_s *rctx)
 						rctx->iv_ctr_len);
 
 	if (ctx->auth.alg == HASH_ALG_AES)
-		hash_parms.type = ctx->cipher_type;
+		hash_parms.type = (enum hash_type)ctx->cipher_type;
 
 	/* General case AAD padding (CCM and RFC4543 special cases below) */
 	aead_parms.aad_pad_len = spu->spu_gcm_ccm_pad_len(ctx->cipher.mode,
-- 
2.16.2