Create a taskqueue for each wireless interface which provides a serialised

sleepable context for net80211 driver callbacks. This removes the need for USB
and firmware based drivers to roll their own code to defer the chip programming
for state changes, scan requests, channel changes and mcast/promisc updates.
When a driver callback completes the hardware state is now guaranteed to have
been updated and is in sync with net80211 layer.

This nukes around 1300 lines of code from the wireless device drivers making
them more readable and less race prone.

The net80211 layer has been updated as follows
 - all state/channel changes are serialised on the taskqueue.
 - ieee80211_new_state() always queues and can now be called from any context
 - scanning runs from a single taskq function and executes to completion. driver
   callbacks are synchronous so the channel, phy mode and rx filters are
   guaranteed to be set in hardware before probe request frames are
   transmitted.

Help and contributions from Sam Leffler.

Reviewed by:	sam

1 files changed, 1 insertions, 4 deletions

diff --git a/sys/dev/if_ndis/if_ndisvar.h b/sys/dev/if_ndis/if_ndisvar.h
index 6db48a6..fc7ae4c 100644
--- a/sys/dev/if_ndis/if_ndisvar.h
+++ b/sys/dev/if_ndis/if_ndisvar.h
@@ -180,6 +180,7 @@ struct ndis_softc {
 	ndis_miniport_block	*ndis_block;
 	ndis_miniport_characteristics	*ndis_chars;
 	interface_type		ndis_type;
+	struct callout		ndis_scan_callout;
 	struct callout		ndis_stat_callout;
 	int			ndis_maxpkts;
 	ndis_oid		*ndis_oids;
@@ -219,10 +220,6 @@ struct ndis_softc {
 	struct ifqueue		ndis_rxqueue;
 	kspin_lock		ndis_rxlock;
 
-	struct taskqueue	*ndis_tq;		/* private task queue */
-	struct task		ndis_scantask;
-	struct task		ndis_authtask;
-	struct task		ndis_assoctask;
 	int			(*ndis_newstate)(struct ieee80211com *,
 				    enum ieee80211_state, int);
 	int			ndis_tx_timer;