From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 12 Jul 2016 05:17:55 +0000 (+0800)
Subject: crypto: scatterwalk - Add no-copy support to copychunks
X-Git-Tag: v4.8-rc1~165^2~16
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=85eccddee401ae81067e763516889780b5545160;p=platform%2Fkernel%2Flinux-exynos.git

crypto: scatterwalk - Add no-copy support to copychunks

The function ablkcipher_done_slow is pretty much identical to
scatterwalk_copychunks except that it doesn't actually copy as
the processing hasn't been completed yet.

This patch allows scatterwalk_copychunks to be used in this case
by specifying out == 2.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index 03ca4ae..e124ce2 100644
--- a/crypto/scatterwalk.c
+++ b/crypto/scatterwalk.c
@@ -87,9 +87,11 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
 		if (len_this_page > nbytes)
 			len_this_page = nbytes;
 
-		vaddr = scatterwalk_map(walk);
-		memcpy_dir(buf, vaddr, len_this_page, out);
-		scatterwalk_unmap(vaddr);
+		if (out != 2) {
+			vaddr = scatterwalk_map(walk);
+			memcpy_dir(buf, vaddr, len_this_page, out);
+			scatterwalk_unmap(vaddr);
+		}
 
 		scatterwalk_advance(walk, len_this_page);
 
@@ -99,7 +101,7 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
 		buf += len_this_page;
 		nbytes -= len_this_page;
 
-		scatterwalk_pagedone(walk, out, 1);
+		scatterwalk_pagedone(walk, out & 1, 1);
 	}
 }
 EXPORT_SYMBOL_GPL(scatterwalk_copychunks);