From: Thomas Graf <tgraf@redhat.com>
Date: Mon, 7 Apr 2008 00:13:23 +0200
Subject: [crytpo] use scatterwalk_sg_next for xcbc
Message-id: 20080406221323.GA24828@lsx.localdomain
O-Subject: [RHEL5.2 PATCH] BZ#439874: Use scatterwalk_sg_next() for xcbc
Bugzilla: 439874

This patch fixes xcbc in RHEL which is required for DoD
certification. The patch has been posted and accepted
upstream already.

Please ACK.

Acked-by: James Morris <jmorris@redhat.com>

diff --git a/crypto/xcbc.c b/crypto/xcbc.c
index e822111..9316b07 100644
--- a/crypto/xcbc.c
+++ b/crypto/xcbc.c
@@ -116,13 +116,11 @@ static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
 	struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
 	struct crypto_cipher *tfm = ctx->child;
 	int bs = crypto_hash_blocksize(parent);
-	unsigned int i = 0;
 
-	do {
-
-		struct page *pg = sg_page(&sg[i]);
-		unsigned int offset = sg[i].offset;
-		unsigned int slen = sg[i].length;
+	for (;;) {
+		struct page *pg = sg_page(sg);
+		unsigned int offset = sg->offset;
+		unsigned int slen = sg->length;
 
 		if (unlikely(slen > nbytes))
 			slen = nbytes;
@@ -182,8 +180,11 @@ static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
 			offset = 0;
 			pg++;
 		}
-		i++;
-	} while (nbytes>0);
+
+		if (!nbytes)
+			break;
+		sg = scatterwalk_sg_next(sg);
+	} 
 
 	return 0;
 }