mac80211: introduce channel context skeleton code

Channel context are the foundation for multi-channel
operation. They are are immutable and are re-created
(or re-used if other interfaces are bound to a certain
channel and a compatible channel type) on channel
switching.

This is an initial implementation and more features
will come in separate patches.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
[some changes including RCU protection]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index c80c4490351c..9be3ef1d2e86 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -626,6 +626,9 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
         spin_lock_init(&local->filter_lock);
         spin_lock_init(&local->queue_stop_reason_lock);
 
+        INIT_LIST_HEAD(&local->chanctx_list);
+        mutex_init(&local->chanctx_mtx);
+
         /*
          * The rx_skb_queue is only accessed from tasklets,
          * but other SKB queues are used from within IRQ