From: Harsh Jain <harsh@chelsio.com>
Date: Thu, 11 Jan 2018 16:45:50 +0530
Subject: crypto: chelsio - Fix IV updated in XTS operation
Patch-mainline: v4.16-rc1
Git-commit: 209897d54a7741522a696ec4ad463049157ca082
References: bsc#1097585 bsc#1097586 bsc#1097587 bsc#1097588 bsc#1097583 bsc#1097584

Skip decrypt operation on IV received from HW for last request.

Signed-off-by: Harsh Jain <harsh@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/crypto/chelsio/chcr_algo.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
 mode change 100644 => 100755 drivers/crypto/chelsio/chcr_algo.c

--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -1008,7 +1008,8 @@ static unsigned int adjust_ctr_overflow(
 	return bytes;
 }
 
-static int chcr_update_tweak(struct ablkcipher_request *req, u8 *iv)
+static int chcr_update_tweak(struct ablkcipher_request *req, u8 *iv,
+			     u32 isfinal)
 {
 	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 	struct ablk_ctx *ablkctx = ABLK_CTX(c_ctx(tfm));
@@ -1035,7 +1036,8 @@ static int chcr_update_tweak(struct ablk
 	for (i = 0; i < (round % 8); i++)
 		gf128mul_x_ble((le128 *)iv, (le128 *)iv);
 
-	crypto_cipher_decrypt_one(cipher, iv, iv);
+	if (!isfinal)
+		crypto_cipher_decrypt_one(cipher, iv, iv);
 out:
 	return ret;
 }
@@ -1056,7 +1058,7 @@ static int chcr_update_cipher_iv(struct
 			CTR_RFC3686_IV_SIZE) = cpu_to_be32((reqctx->processed /
 						AES_BLOCK_SIZE) + 1);
 	else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS)
-		ret = chcr_update_tweak(req, iv);
+		ret = chcr_update_tweak(req, iv, 0);
 	else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
 		if (reqctx->op)
 			sg_pcopy_to_buffer(req->src, sg_nents(req->src), iv,
@@ -1087,7 +1089,7 @@ static int chcr_final_cipher_iv(struct a
 		ctr_add_iv(iv, req->info, (reqctx->processed /
 			   AES_BLOCK_SIZE));
 	else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS)
-		ret = chcr_update_tweak(req, iv);
+		ret = chcr_update_tweak(req, iv, 1);
 	else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
 		if (reqctx->op)
 			sg_pcopy_to_buffer(req->src, sg_nents(req->src), iv,