[PATCH 1/2] net: linkwatch: send change uevent on link changes

[Jouke Witteveen <j.witteveen@gmail.com>]

Make it easy for userspace to respond to acquisition/loss of carrier.
The uevent is picked up by udev and, on systems with systemd, the
device unit of the interface announces a configuration reload.

Signed-off-by: Jouke Witteveen <j.witteveen@gmail.com>
---
I did not want to change the commit message into a systemd-howto, but
subscribing to udev events can be done through a line like
    ReloadPropagatedFrom=sys-subsystem-net-devices-%i.device
in a systemd unit file.

 net/core/link_watch.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/link_watch.c b/net/core/link_watch.c
index 7f51efb2b..66aeb88f8 100644
--- a/net/core/link_watch.c
+++ b/net/core/link_watch.c
@@ -162,6 +162,8 @@ static void linkwatch_do_dev(struct net_device *dev)
 			dev_deactivate(dev);
 
 		netdev_state_change(dev);
+
+		kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
 	}
 	dev_put(dev);
 }
-- 
2.19.2