@@ -1005,12 +1005,13 @@ static void zd_op_configure_filter(struct ieee80211_hw *hw,
changed_flags &= SUPPORTED_FIF_FLAGS;
*new_flags &= SUPPORTED_FIF_FLAGS;
- /* changed_flags is always populated but this driver
- * doesn't support all FIF flags so its possible we don't
- * need to do anything */
- if (!changed_flags)
- return;
-
+ /*
+ * If multicast parameter (as returned by zd_op_prepare_multicast)
+ * has changed, no bit in changed_flags is set. To handle this
+ * situation, we do not return if changed_flags is 0. If we do so,
+ * we will have some issue with IPv6 which uses multicast for link
+ * layer address resolution.
+ */
if (*new_flags & (FIF_PROMISC_IN_BSS | FIF_ALLMULTI))
zd_mc_add_all(&hash);