When the DTIM setting is read from beacons, mac80211 will assume it is 1 if the TIM IE is not present or the value is 0. This sounds fine, but the same function processes probe responses as well, which don't have a TIM IE. This leads to overwriting any values previously parsed out of beacon frames. Thus, instead of checking for the presence of the TIM IE when setting the default, simply check whether the DTIM period value is valid already. If the TIM IE is not there then the value cannot be valid (it is initialised to 0) and probe responses received after beacons will not lead to overwriting an already valid value. Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx> --- It's a bug, but probably not severe enough to warrant looking into putting it into -stable. net/mac80211/scan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- wireless-testing.orig/net/mac80211/scan.c 2009-09-17 10:14:59.000000000 -0700 +++ wireless-testing/net/mac80211/scan.c 2009-09-17 10:15:18.000000000 -0700 @@ -90,8 +90,8 @@ ieee80211_bss_info_update(struct ieee802 bss->dtim_period = tim_ie->dtim_period; } - /* set default value for buggy APs */ - if (!elems->tim || bss->dtim_period == 0) + /* set default value for buggy AP/no TIM element */ + if (bss->dtim_period == 0) bss->dtim_period = 1; bss->supp_rates_len = 0; -- 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
