From: Sujith Manoharan <c_manoha@xxxxxxxxxxxxxxxx>
Using the BSS information stored in mac80211 directly
is racy in certain conditions. For example, in a MCC
setup, if the scheduler is switching channels when
a local deauth is issued, calculation of the opmode/bssid
etc. is incorrect. To avoid this, store the bss params
in the driver and use it.
Signed-off-by: Sujith Manoharan <c_manoha@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/ath9k.h | 5 +++++
drivers/net/wireless/ath/ath9k/channel.c | 6 +++---
drivers/net/wireless/ath/ath9k/main.c | 13 +++++++++----
3 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 8cd116e..d2a1ee1 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -585,6 +585,11 @@ void ath9k_release_buffered_frames(struct ieee80211_hw *hw,
struct ath_vif {
struct list_head list;
+ /* BSS info */
+ u8 bssid[ETH_ALEN];
+ u16 aid;
+ bool assoc;
+
struct ieee80211_vif *vif;
struct ath_node mcast_node;
int av_bslot;
diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c
index 77c99eb5..b93f83c 100644
--- a/drivers/net/wireless/ath/ath9k/channel.c
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -211,7 +211,7 @@ void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
switch (vif->type) {
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_STATION:
- if (vif->bss_conf.assoc)
+ if (avp->assoc)
active = true;
break;
default:
@@ -917,7 +917,7 @@ ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
switch (vif->type) {
case NL80211_IFTYPE_STATION:
- if (!vif->bss_conf.assoc)
+ if (!avp->assoc)
return false;
skb = ieee80211_nullfunc_get(sc->hw, vif);
@@ -1339,7 +1339,7 @@ void ath9k_p2p_ps_timer(void *priv)
rcu_read_lock();
vif = avp->vif;
- sta = ieee80211_find_sta(vif, vif->bss_conf.bssid);
+ sta = ieee80211_find_sta(vif, avp->bssid);
if (!sta)
goto out;
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index fbf23ac..6738c4d 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -898,6 +898,7 @@ static bool ath9k_uses_beacons(int type)
static void ath9k_vif_iter(struct ath9k_vif_iter_data *iter_data,
u8 *mac, struct ieee80211_vif *vif)
{
+ struct ath_vif *avp = (struct ath_vif *)vif->drv_priv;
int i;
if (iter_data->has_hw_macaddr) {
@@ -918,7 +919,7 @@ static void ath9k_vif_iter(struct ath9k_vif_iter_data *iter_data,
break;
case NL80211_IFTYPE_STATION:
iter_data->nstations++;
- if (vif->bss_conf.assoc && !iter_data->primary_sta)
+ if (avp->assoc && !iter_data->primary_sta)
iter_data->primary_sta = vif;
break;
case NL80211_IFTYPE_ADHOC:
@@ -963,13 +964,13 @@ static void ath9k_set_assoc_state(struct ath_softc *sc,
struct ieee80211_vif *vif, bool changed)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
- struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
+ struct ath_vif *avp = (struct ath_vif *)vif->drv_priv;
unsigned long flags;
set_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags);
- ether_addr_copy(common->curbssid, bss_conf->bssid);
- common->curaid = bss_conf->aid;
+ ether_addr_copy(common->curbssid, avp->bssid);
+ common->curaid = avp->aid;
ath9k_hw_write_associd(sc->sc_ah);
if (changed) {
@@ -1698,6 +1699,10 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
ath_dbg(common, CONFIG, "BSSID %pM Changed ASSOC %d\n",
bss_conf->bssid, bss_conf->assoc);
+ ether_addr_copy(avp->bssid, bss_conf->bssid);
+ avp->aid = bss_conf->aid;
+ avp->assoc = bss_conf->assoc;
+
ath9k_calculate_summary_state(sc, avp->chanctx);
if (ath9k_is_chanctx_enabled()) {
--
2.1.0
--
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