path: root/net
diff options
authorJouni Malinen <jouni.malinen@atheros.com>2009-05-19 17:01:43 +0300
committerJohn W. Linville <linville@tuxdriver.com>2009-05-20 14:46:33 -0400
commit30196673fe17934617b5d5bfd456a0edf057a0b9 (patch)
tree48f2d37cb7b47d83a1d45c6e9e258d7c8b26800a /net
parentdc8c4585d2e6f3bf5c9d8c0a6036b591bd3baf2e (diff)
mac80211: PS processing for every Beacon with our AID in TIM
If the AP includes our AID in the TIM IE, we need to process the Beacon frame as far as PS is concerned (send PS-Poll or nullfunc data with PM=0). The previous code skipped this in cases where the CRC value did not change and it would not change if the AP continues including our AID in the TIM.. There is no need to count the crc32 value for directed_tim with this change, so we can remove that part. In order not to change the order of operations (i.e., update WMM parameters prior to sending PS-Poll), the CRC match is checked twice as only after the PS processing step, the rest of the function is skipped if nothing changed in the Beacon. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
1 files changed, 10 insertions, 9 deletions
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index b61a7819867..54a2a1db98a 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1951,16 +1951,13 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
- ncrc = crc32_be(ncrc, (void *)&directed_tim, sizeof(directed_tim));
+ if (ncrc != ifmgd->beacon_crc) {
+ ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
+ true);
- if (ncrc == ifmgd->beacon_crc)
- return;
- ifmgd->beacon_crc = ncrc;
- ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
- ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
- elems.wmm_param_len);
+ ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
+ elems.wmm_param_len);
+ }
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
if (directed_tim) {
@@ -1985,6 +1982,10 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
+ if (ncrc == ifmgd->beacon_crc)
+ return;
+ ifmgd->beacon_crc = ncrc;
if (elems.erp_info && elems.erp_info_len >= 1) {
erp_valid = true;
erp_value = elems.erp_info[0];