amd64/175183: iwn(4) becomes unresponsive during initial configuration

[Sean Bruno]

>Number:         175183
>Category:       amd64
>Synopsis:       iwn(4) becomes unresponsive during initial configuration
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan 10 18:50:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Sean Bruno
>Release:        PC-BSD 9.1
>Organization:
FreeBSD
>Environment:
FreeBSD powernoodle 9.1-RELEASE FreeBSD 9.1-RELEASE #2: Tue Nov 27 03:45:16 UTC 2012     root at darkstar:/usr/obj/pcbsd-build90/fbsd-source/9.1/sys/GENERIC  amd64

>Description:
It appears that iwn(4) is having issues with initial configuration and setup.  Using network manager in PC-BSD to add/configure a WPA enabled wireless network will result in iwn(4) becoming completely unresponsive.  ifconfig up/down/scan will not do anything.  The system will work *just fine* after a power cycle of the laptop.  Setting the wireless switch off/on does not fix the issue either and there are no messages in the system logs to indicate what is going on.

This seems to happen on Lenovo Thinkpads T420/T520 with the following wireless chipset.


iwn0 at pci0:3:0:0:	class=0x028000 card=0x13118086 chip=0x00858086 rev=0x34 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Centrino Advanced-N 6205'
    class      = network
    bar   [10] = type Memory, range 64, base 0xf5100000, size 8192, enabled

>How-To-Repeat:

>Fix:
Requres a power cycle of the laptop.

>Release-Note:
>Audit-Trail:
>Unformatted: