kern/52039: 7.1_RC2 amd64 panics wm_enable_wakeup on W510 at shutdown

[kardel%netbsd.org@localhost]

>Number:         52039
>Category:       kern
>Synopsis:       7.1_RC2 amd64 panics wm_enable_wakeup on W510 at shutdown
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 06 16:10:00 +0000 2017
>Originator:     Frank Kardel
>Release:        NetBSD 7.1_RC2
>Organization:
	
>Environment:
	
	
System: NetBSD pip.kardel.name 71_RC2 NetBSD 7.1_RC2 (GENERIC)
Architecture: x86_64
Machine: amd64
>Description:
	The kernel of the install image crashes in shutdown in wm_enable_wakeup for the wm0 device.
	No correct shutdown is possible on a Lenovo W510.
Device from dmesg.boot (7.99.64 kernel though - which can correctly shut-down).
wm0 at pci0 dev 25 function 0: PCH LAN (82577LM) Controller (rev. 0x06)
wm0: interrupting at msi2 vec 0
wm0: PCI-Express bus
wm0: 2048 words FLASH
wm0: Ethernet address  xx::xx

>How-To-Repeat:
	Pick a 7.1_RC2 (RC1 has the same issue). Boot the install image on a Lenovo W510. 
	Exit install system. halt. => panic.

>Fix:
	n/a

>Unformatted: