Workaround for "fatal firmware error" iwn(4) problem.

[Anton Shterenlikht]

>From: =?iso-8859-2?Q?Edward_Tomasz_Napiera=B3a?= <trasz at FreeBSD.org>
>Subject: Workaround for "fatal firmware error" iwn(4) problem.
>Date: Fri, 16 May 2014 20:06:02 +0200
>To: "freebsd-hackers at freebsd.org" <freebsd-hackers at FreeBSD.org>
>
>I've started using FreeBSD laptop and iwn(4) failing at random moments
>like this...

see also

http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/176104
http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/189802

BTW, I disabled iwn and tried pccard bwn device instead,
and the errors are gone. Also wireless doesn't disconnect
as it used to with iwn. This is just because I thought
my laptop or setup were to blame. So this is further
evidence that iwn driver is at fault.

Anton