[PATCH v3 06/19] crypto: skcipher - use scatterwalk_start_at_pos()

[Eric Biggers <ebiggers@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

In skcipher_walk_aead_common(), use scatterwalk_start_at_pos() instead
of a sequence of scatterwalk_start(), scatterwalk_copychunks(..., 2),
and scatterwalk_done().  This is simpler and faster.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 crypto/skcipher.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index e3751cc88b76e..33508d001f361 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -361,18 +361,12 @@ static int skcipher_walk_aead_common(struct skcipher_walk *walk,
 		walk->flags = 0;
 
 	if (unlikely(!walk->total))
 		return 0;
 
-	scatterwalk_start(&walk->in, req->src);
-	scatterwalk_start(&walk->out, req->dst);
-
-	scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
-	scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
-
-	scatterwalk_done(&walk->in, 0, walk->total);
-	scatterwalk_done(&walk->out, 0, walk->total);
+	scatterwalk_start_at_pos(&walk->in, req->src, req->assoclen);
+	scatterwalk_start_at_pos(&walk->out, req->dst, req->assoclen);
 
 	/*
 	 * Accessing 'alg' directly generates better code than using the
 	 * crypto_aead_blocksize() and similar helper functions here, as it
 	 * prevents the algorithm pointer from being repeatedly reloaded.
-- 
2.48.1