[PATCH net] sunrpc: fix UDP memory accounting for v4.4 kernel

[JABLONSKY Jan]

The same warnings reported by Jan Stancek may appear also on 4.4
Based on Paolo Abeni's work.

WARNING: at net/ipv4/af_inet.c:155
CPU: 1 PID: 214 Comm: kworker/1:1H Not tainted 4.4.166 #1
Workqueue: rpciod .xprt_autoclose
task: c0000000366f57c0 ti: c000000034134000 task.ti: c000000034134000
NIP [c000000000662268] .inet_sock_destruct+0x158/0x200

Based on: "[net] sunrpc: fix UDP memory accounting"

Signed-off-by: Jan Jablonsky <jan.jablon...@thalesgroup.com>
Signed-off-by: Paolo Abeni <pab...@redhat.com>
Cc: Jan Stancek <jstan...@redhat.com>
---
 net/sunrpc/xprtsock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index c9c0976d3bbb..72277cb9785e 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1056,7 +1056,7 @@ static void xs_udp_data_receive(struct sock_xprt 
*transport)
                if (skb == NULL)
                        break;
                xs_udp_data_read_skb(&transport->xprt, sk, skb);
-               skb_free_datagram(sk, skb);
+               skb_free_datagram_locked(sk, skb);
        }
 out:
        mutex_unlock(&transport->recv_mutex);