[Bug 208860] [net80211]: ieee80211_waitfor_parent() will hang forever if something is enqueued into the taskqueue

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208860

Adrian Chadd <adrian at freebsd.org> changed:

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                 CC|                            |adrian at freebsd.org

--- Comment #1 from Adrian Chadd <adrian at freebsd.org> ---
Yeah, the whole drain/block/cancel thing really irks me with our taskqueue
implementation.

If we want to use the taskqueue for driver related things, then we need some
way to actually cancel/drain all in a sane way. Otherwise we end up only being
able to waitfor_parent on the net80211 tasks, not the driver tasks.

It's also unclear whether we should be waiting for the driver taskqueue calls
to drain/complete with waitfor_parent.

This requires a bunch more thought and planning. I'm open to ideas!

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