kern/51797: iwm(4) does not work after if_iwm.c rev. 1.45

[ryoon%NetBSD.org@localhost]

>Number:         51797
>Category:       kern
>Synopsis:       iwm(4) does not work after if_iwm.c rev. 1.45
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jan 08 08:50:00 +0000 2017
>Originator:     Ryo ONODERA
>Release:        NetBSD 7.99.56
>Organization:
	
>Environment:
	
	
System: NetBSD brownie 7.99.56 NetBSD 7.99.56 (DTRACE7) #79: Sat Jan 7 09:46:55 JST 2017 ryo_on@brownie:/usr/world/7.99/amd64/obj/sys/arch/amd64/compile/DTRACE7 amd64
Architecture: x86_64
Machine: amd64
>Description:
Rev. 1.45 of if_iwm.c and related changes break iwm(4) functionality
on Toshiba dynabook R63/PS laptop.

$ pcictl pci0 list | grep -i wireless
002:00:0: Intel Dual Band Wireless AC 7265 (miscellaneous network, revision 0x59)

$ pcictl pci0 list | grep -i wireless
002:00:0: Intel Dual Band Wireless AC 7265 (miscellaneous network, revision 0x59)

After wpa_supplicant invocation for .11g access point
iwm0: fatal firmware error
iwm0: device timeout
iwm0: device timeout

And cannot detect access point.

Rev. 1.51
https://mail-index.netbsd.org/source-changes/2017/01/08/msg080657.html
also does not work on my laptop.

>How-To-Repeat:
Run NetBSD/amd64 current on Toshiba dynabook R63/PS.
>Fix:
I have no idea.

>Unformatted: