zd1211rw: Fix multicast filtering.

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.

Signed-off-by: Benoit Papillault <benoit.papillault@free.fr>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index cc648ef..9d9b263 100644 (file)
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -987,12 +987,13 @@ 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);