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authorTadeusz Struk <tadeusz.struk@intel.com>2015-03-19 12:31:30 -0700
committerDavid S. Miller <davem@davemloft.net>2015-03-23 16:41:37 -0400
commit66db37391dad834a4f739984eec81af27a68b09c (patch)
treedcd1d019cb5b04bd044ca1d768f45dc9cfadb1d5 /crypto
parent0345f93138b2224e0d7ce91fcffdb3dd23f364d7 (diff)
downloadlinux-linaro-stable-66db37391dad834a4f739984eec81af27a68b09c.tar.gz
crypto: af_alg - Allow to link sgl
Allow to link af_alg sgls. Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/af_alg.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 7f8b7edcadca..26089d182cb7 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -358,8 +358,8 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (WARN_ON(npages == 0))
return -EINVAL;
-
- sg_init_table(sgl->sg, npages);
+ /* Add one extra for linking */
+ sg_init_table(sgl->sg, npages + 1);
for (i = 0, len = n; i < npages; i++) {
int plen = min_t(int, len, PAGE_SIZE - off);
@@ -369,18 +369,26 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
off = 0;
len -= plen;
}
+ sg_mark_end(sgl->sg + npages - 1);
+ sgl->npages = npages;
+
return n;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);
+void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new)
+{
+ sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
+ sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
+}
+EXPORT_SYMBOL(af_alg_link_sg);
+
void af_alg_free_sg(struct af_alg_sgl *sgl)
{
int i;
- i = 0;
- do {
+ for (i = 0; i < sgl->npages; i++)
put_page(sgl->pages[i]);
- } while (!sg_is_last(sgl->sg + (i++)));
}
EXPORT_SYMBOL_GPL(af_alg_free_sg);