From: Wey-Yi Guy <wey-yi.w.guy@xxxxxxxxx>
In current implementation, mac80211 send dtim_period update to driver during
association, but if no NetworkManager or similar application perform scan
operation, plus tim_ie is not part of probe response; mac80211 will not get
beacon with dtim information later, then mac80211 will not pass the
information to driver for update.
Call ieee80211_hw_config() with IEEE80211_CONF_CHANGE_PS flag set to
allow driver make correct dtim adjustment if dtim_period change detected.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@xxxxxxxxx>
---
net/mac80211/scan.c | 19 ++++++++++++++++++-
1 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 71e10ca..a5508f5 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -64,6 +64,7 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
struct ieee80211_bss *bss;
int clen;
s32 signal = 0;
+ struct ieee80211_sub_if_data *sdata;
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
signal = rx_status->signal * 100;
@@ -87,7 +88,23 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
if (elems->tim) {
struct ieee80211_tim_ie *tim_ie =
(struct ieee80211_tim_ie *)elems->tim;
- bss->dtim_period = tim_ie->dtim_period;
+ if (bss->dtim_period != tim_ie->dtim_period) {
+ bss->dtim_period = tim_ie->dtim_period;
+ mutex_lock(&local->iflist_mtx);
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (!netif_running(sdata->dev))
+ continue;
+ if (sdata->vif.type ==
+ NL80211_IFTYPE_STATION &&
+ sdata->u.mgd.associated == bss) {
+ sdata->vif.bss_conf.dtim_period =
+ bss->dtim_period;
+ ieee80211_hw_config(local,
+ IEEE80211_CONF_CHANGE_PS);
+ }
+ }
+ mutex_unlock(&local->iflist_mtx);
+ }
}
/* set default value for buggy AP/no TIM element */
--
1.5.6.3
--
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