laptop power cycles due to iwn since r266546

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Hi,

I get random reboots with revision r266546 (Make iwn(4) able to get
itself back into working condition after "fatal firmware error"
happens.  Previously it was neccessary to reset it manually, using
"/etc/rc.d/netif restart".).

I encounter that on a Thinkpad X220 with a iwn0: <Intel Centrino
Advanced-N + WiMAX 6250> mem 0xf2500000-0xf2501fff irq 17 at device
0.0 on pci3
and a rather flaky wireless connection. I do have to destroy the wlan0
interface every now and then (and get firmware errors in dmesg), but
since r266546 it powercycles my laptop.
If I disable wireless - or revert that commit, my laptop does not
power cycle...

Adrian/trasz - any ideas what might be wrong here? Any ideas how to
debug it further? Will a dumpdev help (if so, is it possible to setup
on geli + zfs?)?


Thanks,

Hannes
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