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ath9k: Fix panic when adding an AP interface

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If a station interface is already assigned to a context
and is active and a second interface of type AP is added,
then beaconing on the new interface has to be begin only
after the BSS_CHANGED_BEACON_ENABLED flag is sent by mac80211
to the driver.

But, since we issue ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL as soon
as a new channel context is added, a switch occurs almost immediately
before BSS_CHANGED_BEACON_ENABLED is received. When a HW reset
is done for the new context, beacons are enabled for the
interface since "enable_beacon" in the BSS config maintained
in mac80211 is true - but the driver hasn't been notified yet.
This causes a panic, since the beacon interval is zero for this
interface and ath9k_cmn_beacon_config_ap() doesn't have a safety check.

Fix this panic by checking if the beacon params has been cached
for this context and use the "enable_beacon" flag maintained
locally in the driver. Also, recalculate the summary data
after the beacon params have been cached when BSS_CHANGED_BEACON_ENABLED
is received.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan 2014-09-05 08:03:11 +05:30 committed by John W. Linville
parent 602607b6e7
commit 9bf30ff93d
1 changed files with 5 additions and 3 deletions
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8
drivers/net/wireless/ath/ath9k/main.c
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@ -916,8 +916,6 @@ static void ath9k_vif_iter(struct ath9k_vif_iter_data *iter_data,
switch (vif->type) {
case NL80211_IFTYPE_AP:
iter_data->naps++;
if (vif->bss_conf.enable_beacon)
iter_data->beacons = true;
break;
case NL80211_IFTYPE_STATION:
iter_data->nstations++;
@ -1021,6 +1019,7 @@ void ath9k_calculate_summary_state(struct ath_softc *sc,
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath9k_vif_iter_data iter_data;
struct ath_beacon_config *cur_conf;
ath_chanctx_check_active(sc, ctx);
@ -1037,8 +1036,11 @@ void ath9k_calculate_summary_state(struct ath_softc *sc,
ath_hw_setbssidmask(common);
if (iter_data.naps > 0) {
cur_conf = &ctx->beacon;
ath9k_hw_set_tsfadjust(ah, true);
ah->opmode = NL80211_IFTYPE_AP;
if (cur_conf->enable_beacon)
iter_data.beacons = true;
} else {
ath9k_hw_set_tsfadjust(ah, false);
@ -1695,9 +1697,9 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
if ((changed & BSS_CHANGED_BEACON_ENABLED) ||
(changed & BSS_CHANGED_BEACON_INT) ||
(changed & BSS_CHANGED_BEACON_INFO)) {
ath9k_beacon_config(sc, vif, changed);
if (changed & BSS_CHANGED_BEACON_ENABLED)
ath9k_calculate_summary_state(sc, avp->chanctx);
ath9k_beacon_config(sc, vif, changed);
}
if ((avp->chanctx == sc->cur_chan) &&