SQUASHME VSOCK: notify other side of SOCK_STREAM disconnect

When a SOCK_STREAM socket is released, notify the other side that no
more data will be sent.  This allows the other side to return from
recvmsg(2) or poll(2) and close the connection.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

net/vmw_vsock/virtio_transport_common.c

@@ -831,7 +831,14 @@ EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
 
 void virtio_transport_release(struct vsock_sock *vsk)
 {
+	struct sock *sk = &vsk->sk;
+
 	pr_debug("%s: vsk=%p\n", __func__, vsk);
+
+	/* Tell other side to terminate connection */
+	if (sk->sk_type == SOCK_STREAM && sk->sk_state == SS_CONNECTED) {
+		virtio_transport_shutdown(vsk, SHUTDOWN_MASK);
+	}
 }
 EXPORT_SYMBOL_GPL(virtio_transport_release);