net: Add and use skb_copy_datagram_msg() helper.

This encapsulates all of the skb_copy_datagram_iovec() callers
with call argument signature "skb, offset, msghdr->msg_iov, length".

When we move to iov_iters in the networking, the iov_iter object will
sit in the msghdr.

Having a helper like this means there will be less places to touch
during that transformation.

Based upon descriptions and patch from Al Viro.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index f1de72de273e..580b79452bec 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2401,7 +2401,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
         }
 
         skb_reset_transport_header(data_skb);
-        err = skb_copy_datagram_iovec(data_skb, 0, msg->msg_iov, copied);
+        err = skb_copy_datagram_msg(data_skb, 0, msg, copied);
 
         if (msg->msg_name) {
                 DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name);