mac80211: allow configure_filter callback to sleep

Over time, a whole bunch of drivers have come up
with their own scheme to delay the configure_filter
operation to a workqueue. To be able to simplify
things, allow configure_filter to sleep, and add
a new prepare_multicast callback that drivers that
need the multicast address list implement. This new
callback must be atomic, but most drivers either
don't care or just calculate a hash which can be
done atomically and then uploaded to the hardware
non-atomically.

A cursory look suggests that at76c50x-usb, ar9170,
mwl8k (which is actually very broken now), rt2x00,
wl1251, wl1271 and zd1211 should make use of this
new capability.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 14 deletions

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index e091cbc3434f..1e04be6b9129 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -292,13 +292,7 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
         if (was_hw_scan)
                 goto done;
 
-        spin_lock_bh(&local->filter_lock);
-        local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
-        drv_configure_filter(local, FIF_BCN_PRBRESP_PROMISC,
-                             &local->filter_flags,
-                             local->mc_count,
-                             local->mc_list);
-        spin_unlock_bh(&local->filter_lock);
+        ieee80211_configure_filter(local);
 
         drv_sw_scan_complete(local);
 
@@ -376,13 +370,7 @@ static int ieee80211_start_sw_scan(struct ieee80211_local *local)
         local->next_scan_state = SCAN_DECISION;
         local->scan_channel_idx = 0;
 
-        spin_lock_bh(&local->filter_lock);
-        local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
-        drv_configure_filter(local, FIF_BCN_PRBRESP_PROMISC,
-                             &local->filter_flags,
-                             local->mc_count,
-                             local->mc_list);
-        spin_unlock_bh(&local->filter_lock);
+        ieee80211_configure_filter(local);
 
         /* TODO: start scan as soon as all nullfunc frames are ACKed */
         ieee80211_queue_delayed_work(&local->hw,