From: Eric Biggers <ebiggers@google.com>
Date: Wed, 19 Feb 2025 18:23:30 +0000 (-0800)
Subject: crypto: arm/ghash - use the new scatterwalk functions
X-Git-Tag: v6.15-rc1~118^2~107
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5dc14e0bcea7ade1f284a1724ae4e614fd61438b;p=thirdparty%2Fkernel%2Flinux.git

crypto: arm/ghash - use the new scatterwalk functions

Use scatterwalk_next() which consolidates scatterwalk_clamp() and
scatterwalk_map(), and use scatterwalk_done_src() which consolidates
scatterwalk_unmap(), scatterwalk_advance(), and scatterwalk_done().
Remove unnecessary code that seemed to be intended to advance to the
next sg entry, which is already handled by the scatterwalk functions.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/arch/arm/crypto/ghash-ce-glue.c b/arch/arm/crypto/ghash-ce-glue.c
index 3af9970825340..9613ffed84f93 100644
--- a/arch/arm/crypto/ghash-ce-glue.c
+++ b/arch/arm/crypto/ghash-ce-glue.c
@@ -459,17 +459,12 @@ static void gcm_calculate_auth_mac(struct aead_request *req, u64 dg[], u32 len)
 	scatterwalk_start(&walk, req->src);
 
 	do {
-		u32 n = scatterwalk_clamp(&walk, len);
-		u8 *p;
+		unsigned int n;
+		const u8 *p;
 
-		if (!n) {
-			scatterwalk_start(&walk, sg_next(walk.sg));
-			n = scatterwalk_clamp(&walk, len);
-		}
-
-		p = scatterwalk_map(&walk);
+		p = scatterwalk_next(&walk, len, &n);
 		gcm_update_mac(dg, p, n, buf, &buf_count, ctx);
-		scatterwalk_unmap(p);
+		scatterwalk_done_src(&walk, p, n);
 
 		if (unlikely(len / SZ_4K > (len - n) / SZ_4K)) {
 			kernel_neon_end();
@@ -477,8 +472,6 @@ static void gcm_calculate_auth_mac(struct aead_request *req, u64 dg[], u32 len)
 		}
 
 		len -= n;
-		scatterwalk_advance(&walk, n);
-		scatterwalk_done(&walk, 0, len);
 	} while (len);
 
 	if (buf_count) {