iwlwifi: introduce beacon context

Only one context can be beaconing at a time,
but we need to track which one. Introduce a
new variable priv->beacon_ctx to do that.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index c17c67f..e1565f7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1437,6 +1437,8 @@
 	struct work_struct rx_replenish;
 	struct work_struct abort_scan;
 	struct work_struct beacon_update;
+	struct iwl_rxon_context *beacon_ctx;
+
 	struct work_struct tt_work;
 	struct work_struct ct_enter;
 	struct work_struct ct_exit;