[PATCH 0/7] implement background scan

[Helmut Schaa <helmut.schaa@googlemail.com>]

This patch series implements basic background scanning in mac80211
by interrupting the scan after each scanned channel to allow RX/TX.

I only tested the patches on current wireless-testing with iwlagn
in sw-scan mode and it works fine already. Nevertheless, it would
be great if somebody could test the patches on other hardware as well.

A scan now takes ~13s on my iwl4965 with a total of 31 channels
(17 passive channels) while associated. Two possibilities for the
future to reduce the time a scan takes:
- leave the operating channel as soon as RX and TX were idle for
  a small period of time (currently we just stay 250ms on the
  operating channel after each scanned channel).
- Scan multiple channels in a row if the qos latency allows us to
  do so.

Helmut
---

Helmut Schaa (7):
      cfg80211: increase scan result expire time
      mac80211: rename scan_state to next_scan_state
      mac80211: implement basic background scanning
      mac80211: Replace {sw,hw}_scanning variables with a bitfield
      mac80211: introduce a new scan state "decision"
      mac80211: advance the state machine immediately if no delay is needed
      mac80211: refactor the scan code


 net/mac80211/ibss.c        |    2 
 net/mac80211/ieee80211_i.h |   41 ++++++
 net/mac80211/iface.c       |    4 -
 net/mac80211/main.c        |    2 
 net/mac80211/mesh.c        |    2 
 net/mac80211/mlme.c        |    8 +
 net/mac80211/rx.c          |    8 +
 net/mac80211/scan.c        |  300 ++++++++++++++++++++++++++++++++------------
 net/mac80211/tx.c          |    6 -
 net/wireless/scan.c        |    2 
 10 files changed, 275 insertions(+), 100 deletions(-)

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