em(4) regression between r289975 and r300212

[Anton Shterenlikht]

>From benjamin.villain at gmail.com Mon May 23 10:22:53 2016
>
>Hi Anton,
>
>I have the same behavior on my workstation. I just applied K. Macy's patch
>and it seems to work for now.

Looks like it's been committed already:

r300372 | avg | 2016-05-21 15:51:49 +0100 (Sat, 21 May 2016) | 5 lines
Changed paths:
   M /head/sys/kern/subr_taskqueue.c
   M /head/sys/sys/_task.h
   M /head/sys/sys/taskqueue.h

fix loss of taskqueue wakeups (introduced in r300113)

Submitted by:   kmacy
Tested by:      dchagin

I'm building r300487 now, will see.

Thanks

Anton