Add a new work-queue for destructing stations?

[Ben Greear <greearb@candelatech.com>]

As previously posted, there can be cases where the RTNL is held for a
very long time when trying to do the:  flush_workqueue(local->workqueue);
in mac80211_do_stop because there are lots of 'slow' work-items queued up.

I'd like to work on making this faster...

My first idea is to add a second work-queue to the 'local' for high-priority
items that can be executed independently from the current local->workqueue,
and put the free_sta_rcu work() in that queue.

I'm guessing that to be safe, the do_stop() code would need to selectively
purge any work items in the local->workqueue that relate to the sdata
being destroyed, as well.  I'm not sure how possible that would be...

Any comments on this, or suggestions for a better way to do this?

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com