[PATCH 3/5] crypto: chelsio - Fix IV updated in XTS operation

[Harsh Jain]

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

Signed-off-by: Harsh Jain <ha...@chelsio.com>
---
 drivers/crypto/chelsio/chcr_algo.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
 mode change 100644 => 100755 drivers/crypto/chelsio/chcr_algo.c

diff --git a/drivers/crypto/chelsio/chcr_algo.c 
b/drivers/crypto/chelsio/chcr_algo.c
old mode 100644
new mode 100755
index 280377f..27ee920
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -1017,7 +1017,8 @@ static unsigned int adjust_ctr_overflow(u8 *iv, u32 bytes)
        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));
@@ -1044,7 +1045,8 @@ static int chcr_update_tweak(struct ablkcipher_request 
*req, u8 *iv)
        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;
 }
@@ -1065,7 +1067,7 @@ static int chcr_update_cipher_iv(struct 
ablkcipher_request *req,
                        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,
@@ -1096,7 +1098,7 @@ static int chcr_final_cipher_iv(struct ablkcipher_request 
*req,
                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,
-- 
2.1.4