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crypto: scatterwalk - Add no-copy support to copychunks

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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>
This commit is contained in:
Herbert Xu 2016-07-12 13:17:55 +08:00
parent 5506f53c7c
commit 85eccddee4
1 changed files with 6 additions and 4 deletions
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10
crypto/scatterwalk.c
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@ -87,9 +87,11 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
if (len_this_page > nbytes) if (len_this_page > nbytes)
len_this_page = nbytes; len_this_page = nbytes;
vaddr = scatterwalk_map(walk); if (out != 2) {
memcpy_dir(buf, vaddr, len_this_page, out); vaddr = scatterwalk_map(walk);
scatterwalk_unmap(vaddr); memcpy_dir(buf, vaddr, len_this_page, out);
scatterwalk_unmap(vaddr);
}
scatterwalk_advance(walk, len_this_page); scatterwalk_advance(walk, len_this_page);
@ -99,7 +101,7 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
buf += len_this_page; buf += len_this_page;
nbytes -= len_this_page; nbytes -= len_this_page;
scatterwalk_pagedone(walk, out, 1); scatterwalk_pagedone(walk, out & 1, 1);
} }
} }
EXPORT_SYMBOL_GPL(scatterwalk_copychunks); EXPORT_SYMBOL_GPL(scatterwalk_copychunks);