net: core: dev: Add extack argument to __dev_change_flags()

In order to pass extack together with NETDEV_PRE_UP notifications, it's
necessary to route the extack to __dev_open() from diverse (possibly
indirect) callers. The last missing API is __dev_change_flags().

Therefore extend __dev_change_flags() with and extra extack argument and
update the two existing users.

Since the function declaration line is changed anyway, name the struct
net_device argument to placate checkpatch.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -3611,7 +3611,8 @@ int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
 int dev_ifconf(struct net *net, struct ifconf *, int);
 int dev_ethtool(struct net *net, struct ifreq *);
 unsigned int dev_get_flags(const struct net_device *);
-int __dev_change_flags(struct net_device *, unsigned int flags);
+int __dev_change_flags(struct net_device *dev, unsigned int flags,
+		       struct netlink_ext_ack *extack);
 int dev_change_flags(struct net_device *dev, unsigned int flags,
 		     struct netlink_ext_ack *extack);
 void __dev_notify_flags(struct net_device *, unsigned int old_flags,

net/core/dev.c

@@ -7498,7 +7498,8 @@ unsigned int dev_get_flags(const struct net_device *dev)
 }
 EXPORT_SYMBOL(dev_get_flags);
 
-int __dev_change_flags(struct net_device *dev, unsigned int flags)
+int __dev_change_flags(struct net_device *dev, unsigned int flags,
+		       struct netlink_ext_ack *extack)
 {
 	unsigned int old_flags = dev->flags;
 	int ret;
@@ -7606,7 +7607,7 @@ int dev_change_flags(struct net_device *dev, unsigned int flags,
 	int ret;
 	unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
 
-	ret = __dev_change_flags(dev, flags);
+	ret = __dev_change_flags(dev, flags, extack);
 	if (ret < 0)
 		return ret;
 

net/core/rtnetlink.c

@@ -2871,7 +2871,8 @@ int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
 
 	old_flags = dev->flags;
 	if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
-		err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
+		err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
+					 NULL);
 		if (err < 0)
 			return err;
 	}