[6.1-RC] xl(4) 'command never completed' infinite loop on shutdown

[Joerg Pernfuss]

Hi guys,

when I upgraded my Laptop (ThinkPad 600) to FreeBSD 6.0 I had some
issues with my pccard based ethernet. These were somewhat resolved
with advice I got from mobile at . Setting 
    hw.cbb.start_memory=0xd8000
    hw.pci.link.LNKA.irq=11
    hw.pci.link.LNKB.irq=11
    hw.pci.link.LNKC.irq=11
    hw.pci.link.LNKD.irq=11
in /boot/loader.conf eased the pain.

Yesterday i updated my sources to the latest RELENG_6 and thought
I'd give it a try without that bandaid.

With device polling and net.isr.direct=1 my 3com 3CCFE575BT based
ethernet (serviced by xl(4)) flies with around 6MiByte/s and the
system is still as responsive as if nothing happens. Great work.

One minor nit though, upon shutdown, after the buffers are synced and
the uptime was reported, the systems prints 'xl0: command never
completed!' forever. Actually I aborted after 5 minutes, but I doubt
the behaviour would have changed significantly if I waited another
10 minutes.

Attached you find:
	- verbose dmesg
	- /boot/loader.conf
	- kernel config (MJOELNIR)

I shouldn't forget to mention, the system has daichi@'s unionfs patchset
11 applied. Other than that, stock sources.

Mail archives and google were inconclusive so far. Any ideas?
Meanwhile I'll play a bit with my serial cable, maybe I can get some
output from a shutdown stage that late.

Regards,
	Jörg
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