mac80211: track whether to use channel contexts

Depending on the driver, channel contexts may be used or
not. If they are used, the driver must have support for
hardware scan and remain-on-channel; otherwise the driver
must not advertise support for multiple channels.

Also prohibit WDS type interfaces when channel contexts
are to be used as there's no clear definition of which
channel they use.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c
index 83608ac16780..9c52fc4a045e 100644
--- a/net/mac80211/offchannel.c
+++ b/net/mac80211/offchannel.c
@@ -107,6 +107,9 @@ void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local,
 {
         struct ieee80211_sub_if_data *sdata;
 
+        if (WARN_ON(local->use_chanctx))
+                return;
+
         /*
          * notify the AP about us leaving the channel and stop all
          * STA interfaces.
@@ -145,6 +148,9 @@ void ieee80211_offchannel_return(struct ieee80211_local *local,
 {
         struct ieee80211_sub_if_data *sdata;
 
+        if (WARN_ON(local->use_chanctx))
+                return;
+
         mutex_lock(&local->iflist_mtx);
         list_for_each_entry(sdata, &local->interfaces, list) {
                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)