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, 2 deletions

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index bb9cbc17d926..af662669f951 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -819,8 +819,7 @@ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
                         used = len;
 
                 if (!(flags & MSG_TRUNC)) {
-                        int rc = skb_copy_datagram_iovec(skb, offset,
-                                                         msg->msg_iov, used);
+                        int rc = skb_copy_datagram_msg(skb, offset, msg, used);
                         if (rc) {
                                 /* Exception. Bailout! */
                                 if (!copied)