[Bug 217721] axge(4) hangs while link goes offline

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217721

            Bug ID: 217721
           Summary: axge(4) hangs while link goes offline
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: lozovoy.ep+bugsfreebsd at gmail.com

Created attachment 180740
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180740&action=edit
axge patch that works for me

How to reproduce: 
1. disconnect link from axge network card
2. run "while true; do wake ue0 11:22:33:44:55:66; done"
3. get a lot of "No buffer space available" messages
4. connect link back
5. try to do "wake" (or something else) one more time
6. get "No buffer space available" message

# usbconfig
ugen0.1: <XHCI root HUB 0x8086> at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps)
pwr=SAVE (0mA)
ugen0.2: <AX88179 ASIX Elec. Corp.> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=ON (248mA)

# uname -a
FreeBSD zinc 11.0-RELEASE-p8 FreeBSD 11.0-RELEASE-p8 #0: Wed Feb 22 06:12:04
UTC 2017     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC 
amd64


I'm not familiar with freebsd kernel internals, but attached patch works for me
for a long time and no side effects observed.

Also I suppose same problem with axe(4).

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