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 @@
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 @@
buf += len_this_page;
nbytes -= len_this_page;
- scatterwalk_pagedone(walk, out, 1);
+ scatterwalk_pagedone(walk, out & 1, 1);
}
}
EXPORT_SYMBOL_GPL(scatterwalk_copychunks);