crypto: rsa-pkcs1pad - Remove bogus page splitting
The helper pkcs1pad_sg_set_buf tries to split a buffer that crosses
a page boundary into two SG entries. This is unnecessary. This
patch removes that.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index 5c1c78e..d9baefb 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -103,7 +103,7 @@
struct pkcs1pad_request {
struct akcipher_request child_req;
- struct scatterlist in_sg[3], out_sg[2];
+ struct scatterlist in_sg[2], out_sg[1];
uint8_t *in_buf, *out_buf;
};
@@ -163,19 +163,10 @@
static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,
struct scatterlist *next)
{
- int nsegs = next ? 1 : 0;
+ int nsegs = next ? 2 : 1;
- if (offset_in_page(buf) + len <= PAGE_SIZE) {
- nsegs += 1;
- sg_init_table(sg, nsegs);
- sg_set_buf(sg, buf, len);
- } else {
- nsegs += 2;
- sg_init_table(sg, nsegs);
- sg_set_buf(sg + 0, buf, PAGE_SIZE - offset_in_page(buf));
- sg_set_buf(sg + 1, buf + PAGE_SIZE - offset_in_page(buf),
- offset_in_page(buf) + len - PAGE_SIZE);
- }
+ sg_init_table(sg, nsegs);
+ sg_set_buf(sg, buf, len);
if (next)
sg_chain(sg, nsegs, next);