[Bug 252165] usb network and mii bus media status race condition

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

--- Comment #36 from Ali Abdallah <[email protected]> ---
(In reply to Hans Petter Selasky from comment #26)

The issue is that ioctl thread to get the media status, which basically started
by userspace races with ue_tick_task. And I finally know why.

The usbd_do_request_flags called releases the lock and then later acquire it
(see the code). So, an ioctl waiting on the same lock will be executed together
with ue_tick_task (because they aren't executed from the same thread), causing
the race observed here and basically breaking all usb ethernet devices.

I will shortly attach a patch to Sync ioctl/tick media status changes.

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