kern/52106: iwn(4) goes to sleep

[prlw1%cam.ac.uk@localhost]

>Number:         52106
>Category:       kern
>Synopsis:       iwn(4) goes to sleep
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 23 13:45:00 +0000 2017
>Originator:     Patrick Welche
>Release:        NetBSD-7.99.66/amd64
>Organization:
>Environment:
-current of 21 Mar 2017
>Description:
Successfully configure a laptop with a iwn(4) Intel Centrino Advanced-N 6230
using wpa_supplicant and dhcpcd. Leave it alone for a while.

Pinging it fails until you go to the laptop and ping something.

It seems that emitting a packet of some sort is necessary to get networking going again.
>How-To-Repeat:

>Fix: