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authorJohannes Berg <johannes@sipsolutions.net>2009-09-17 10:19:23 -0700
committerJohn W. Linville <linville@tuxdriver.com>2009-09-23 11:35:53 -0400
commit6a211bf1fc63891bfbc510d9caa751c4dee4bc37 (patch)
tree9f243de62a131b59520c0bf592332f73a2f93a99 /net/mac80211
parentfe9f6342c86292aee1941447f22dc5470735e5a1 (diff)
mac80211: fix DTIM setting
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@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/scan.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 039901109fa..71e10cabf81 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -90,8 +90,8 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
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;