mac80211: check channel context methods
Verify that the channel context methods are
all assigned by the driver or not used.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 9be3ef1..d709a5d 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -549,6 +549,13 @@
if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
return NULL;
+ /* check all or no channel context operations exist */
+ i = !!ops->add_chanctx + !!ops->remove_chanctx +
+ !!ops->change_chanctx + !!ops->assign_vif_chanctx +
+ !!ops->unassign_vif_chanctx;
+ if (WARN_ON(i != 0 && i != 5))
+ return NULL;
+
/* Ensure 32-byte alignment of our private data and hw private data.
* We use the wiphy priv data for both our ieee80211_local and for
* the driver's private data