af_iucv: recvmsg problem for SOCK_STREAM sockets

Commit f9c41a62 introduced
a problem for SOCK_STREAM sockets, when only part of the
incoming iucv message is received by user space. In this
case the remaining data of the iucv message is lost.
This patch makes sure an incompletely received iucv message
is queued back to the receive queue.
Signed-off-by: NUrsula Braun <ursula.braun@de.ibm.com>
Signed-off-by: NFrank Blaschka <frank.blaschka@de.ibm.com>
Reported-by: NHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/iucv/af_iucv.c

@@ -1382,6 +1382,7 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 		if (sk->sk_type == SOCK_STREAM) {
 			if (copied < rlen) {
 				IUCV_SKB_CB(skb)->offset = offset + copied;
+				skb_queue_head(&sk->sk_receive_queue, skb);
 				goto done;
 			}
 		}