On Wed, Mar 11, 2015 at 9:50 PM, Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote: > On Wed, 2015-03-11 at 21:45 +0530, Krishna Chaitanya wrote: > >> I did some experiments on this and found the root cause. >> >> We are using 5GHz in WORLD Mode, so only passive scan is allowed. >> So when connecting the very first time, the mac80211 MLME sees that >> there are no probe_resp ies (only beacon_ies are present) and it sends >> a directed probe and updates the probe_resp ies. (and also the "ies"). >> >> But when config is changed and we get disconnected, beacon_ies are updated >> with the new config, but the probe_resp ies are not. >> cfg80211_bss_update assigns >> probe_resp ies to "ies' and mac80211 updates its bss info based on the >> probe_resp >> ies which have old config causing the issue. >> >> Solution: >> >> 1) Make the directed probe mandatory. >> 2) As you suggested maintain timestamps for probe_resp_ies and beacon_ies >> and use the latest. >> >> Any takes? > > What's the operational problem here? I don't really see it. Are you > afraid users will reconfigure their APs often enough for this to be an > issue? Use case point of view, i understand that this doesn't happen often. But from functional point of view, it can still happen and even after disconnect mac80211 will not allow connection. Also solution: would be to flush scan results up on disconnection. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
