mac80211: update adjusting TBTT bit in beacon

This regression was introduced in "mac80211: cache mesh
beacon".

mesh_sync_offset_adjust_tbtt()  was assuming that the
beacon would be rebuilt in every single pre-tbtt
interrupt, but now the beacon update happens on the
workqueue, and it must be ready for immediate delivery to
the driver.

Save a pointer to the meshconf IE in the beacon_data (this
works because both the IE pointer and beacon buffer are
protected by the same rcu_{dereference,assign_pointer}())
for quick updates during pre-tbtt. This is faster and a
little prettier than iterating over the elements to find
the meshconf IE every time.

Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 002ded2c01f6..2f0e176e7989 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2604,8 +2604,7 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
                         ieee80211_update_csa(sdata, bcn);
 
                 if (ifmsh->sync_ops)
-                        ifmsh->sync_ops->adjust_tbtt(
-                                                sdata);
+                        ifmsh->sync_ops->adjust_tbtt(sdata, bcn);
 
                 skb = dev_alloc_skb(local->tx_headroom +
                                     bcn->head_len +