[Bug 252165] mii bus media status race condition

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252165

--- Comment #14 from Ali Abdallah <ali.abdallah at suse.com> ---
Even without UE_LOCK and UE_UNLOCK of comment 13 the issue is still
occurring... 

The following dtrace is observed when the link state fictitiously changes 

2  64192               ue_tick_task:entry      242528044179
2  64175                   ure_tick:entry      242528050925
1  64152            ure_ifmedia_sts:entry      242529137165
2  64176                  ure_tick:return      242529369904
1  64152            ure_ifmedia_sts:entry      242529474008
2  64153           ure_ifmedia_sts:return      242530486029

For whatever reason... Normally the sequence should be 

2  64152            ure_ifmedia_sts:entry      243552084077
2  64153           ure_ifmedia_sts:return      243553071554
0  64192               ue_tick_task:entry      243553441743
0  64175                   ure_tick:entry      243553444178
2  64176                  ure_tick:return      243554572011
3  64152            ure_ifmedia_sts:entry      243663084286
3  64153           ure_ifmedia_sts:return      243664074467

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