datagram: open-code copy_page_to_iter

This will be useful to consolidate skb_copy_and_hash_datagram_iter and
skb_copy_and_csum_datagram to a single code path.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sagi Grimberg <sagi@lightbitslabs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 6 insertions, 3 deletions

diff --git a/net/core/datagram.c b/net/core/datagram.c
index 57f3a6fcfc1e..abe642181b64 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -445,11 +445,14 @@ int skb_copy_datagram_iter(const struct sk_buff *skb, int offset,
 
                 end = start + skb_frag_size(frag);
                 if ((copy = end - offset) > 0) {
+                        struct page *page = skb_frag_page(frag);
+                        u8 *vaddr = kmap(page);
+
                         if (copy > len)
                                 copy = len;
-                        n = copy_page_to_iter(skb_frag_page(frag),
-                                              frag->page_offset + offset -
-                                              start, copy, to);
+                        n = copy_to_iter(vaddr + frag->page_offset +
+                                         offset - start, copy, to);
+                        kunmap(page);
                         offset += n;
                         if (n != copy)
                                 goto short_copy;