Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/ppp/pppox.c b/drivers/net/ppp/pppox.c
index c0599b3..08364f1 100644
--- a/drivers/net/ppp/pppox.c
+++ b/drivers/net/ppp/pppox.c
@@ -1,10 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /** -*- linux-c -*- ***********************************************************
  * Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
  *
  * PPPoX --- Generic PPP encapsulation socket family
  * PPPoE --- PPP over Ethernet (RFC 2516)
  *
- *
  * Version:	0.5.2
  *
  * Author:	Michal Ostrowski <mostrows@speakeasy.net>
@@ -12,16 +12,12 @@
  * 051000 :	Initialization cleanup
  *
  * License:
- *		This program is free software; you can redistribute it and/or
- *		modify it under the terms of the GNU General Public License
- *		as published by the Free Software Foundation; either version
- *		2 of the License, or (at your option) any later version.
- *
  */
 
 #include <linux/string.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
+#include <linux/compat.h>
 #include <linux/errno.h>
 #include <linux/netdevice.h>
 #include <linux/net.h>
@@ -103,6 +99,18 @@
 
 EXPORT_SYMBOL(pppox_ioctl);
 
+#ifdef CONFIG_COMPAT
+int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	if (cmd == PPPOEIOCSFWD32)
+		cmd = PPPOEIOCSFWD;
+
+	return pppox_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
+}
+
+EXPORT_SYMBOL(pppox_compat_ioctl);
+#endif
+
 static int pppox_create(struct net *net, struct socket *sock, int protocol,
 			int kern)
 {