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, 2 insertions, 0 deletions

diff --git a/sys/net80211/ieee80211_node.h b/sys/net80211/ieee80211_node.h
index 9e9d254..47f705f 100644
--- a/sys/net80211/ieee80211_node.h
+++ b/sys/net80211/ieee80211_node.h
@@ -286,6 +286,8 @@ void	ieee80211_node_set_chan(struct ieee80211_node *,
 void	ieee80211_create_ibss(struct ieee80211vap*, struct ieee80211_channel *);
 void	ieee80211_reset_bss(struct ieee80211vap *);
 void	ieee80211_sync_curchan(struct ieee80211com *);
+void	ieee80211_setupcurchan(struct ieee80211com *,
+	    struct ieee80211_channel *);
 void	ieee80211_setcurchan(struct ieee80211com *, struct ieee80211_channel *);
 int	ieee80211_ibss_merge(struct ieee80211_node *);
 struct ieee80211_scan_entry;