[Bug 272732] hostapd error with rtwn0: MAC/BB RTL8192EU, RF 6052 2T2R

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272732

--- Comment #3 from Stéphane Rochoy <stephane.rochoy@stormshield.eu> ---
Blaming show that IFF_UP is cleared due to
ded53e898c7be6d610e94c1746fd22304f5c5988. Here is an extract from the commit
message that suggest we're probably chasing a race condition:

There is a hypothesis still pondered that the entire IFF_UP toggling
only exploits a race in net80211 (see further discssussions for more
debugging and alternative solutions see D38508 and D38753).
That may also explain why the changes to the rc startup script [1]
only helped partially for some people to no longer see the
continuous CTRL-EVENT-SCAN-FAILED.

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