wiphy: make wiphy work queue reentrant
In some situations its convenient for the same work item to be
inserted (rescheduled) while its in progress. FT for example does
this now if a roam fails. The same ft_work item gets re-inserted
which, currently, is not safe to do since the item is modified
and removed once completed.
Fix this by introducing wiphy_radio_work_reschedule which is an
explicit API for re-inserting work items from within the do_work
callback.
The wiphy work logic was changed around slightly to remove the item
at the head of the queue prior to starting and note the ID going
into do_work. If do_work signaled done and ID changed we know it
was re-inserted and can skip the destroy logic and move onto the
next item. If the item is not done continue as normal but set the
priority to INT_MIN, as usual, to prevent other items from getting
to the head of the queue.
2 files changed
