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ath9k: fix beacon resource related race condition 

The beacon tasklet is accesssing the bslot info for beacon generation.
Meanwhile the same slot can be freed on interface deletion.
Current the remove_interface disables the beacon alert after freeing the slot.
This may leads to null pointer access.

This patch disables SWBA and kills the beacon tasklet to prevent access
to the slot to be freed. After releasing the slot, swba will be enabled again
upon the availablity of beaconing interfaces.

Signed-off-by: Rajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Rajkumar Manoharan 2010-12-07 17:42:18 +05:30 committed by John W. Linville
parent 38852b20c8
commit 884a963fa1
1 changed files with 7 additions and 14 deletions
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21
drivers/net/wireless/ath/ath9k/main.c
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@ -1520,8 +1520,6 @@ static void ath9k_remove_interface(struct ieee80211_hw *hw,
struct ath_softc *sc = aphy->sc;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_vif *avp = (void *)vif->drv_priv;
bool bs_valid = false;
int i;
ath_print(common, ATH_DBG_CONFIG, "Detach Interface\n");
@ -1535,26 +1533,21 @@ static void ath9k_remove_interface(struct ieee80211_hw *hw,
if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) ||
(sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) ||
(sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT)) {
/* Disable SWBA interrupt */
sc->sc_ah->imask &= ~ATH9K_INT_SWBA;
ath9k_ps_wakeup(sc);
ath9k_hw_set_interrupts(sc->sc_ah, sc->sc_ah->imask);
ath9k_hw_stoptxdma(sc->sc_ah, sc->beacon.beaconq);
ath9k_ps_restore(sc);
tasklet_kill(&sc->bcon_tasklet);
}
ath_beacon_return(sc, avp);
sc->sc_flags &= ~SC_OP_BEACONS;
for (i = 0; i < ARRAY_SIZE(sc->beacon.bslot); i++) {
if (sc->beacon.bslot[i] == vif) {
printk(KERN_DEBUG "%s: vif had allocated beacon "
"slot\n", __func__);
sc->beacon.bslot[i] = NULL;
sc->beacon.bslot_aphy[i] = NULL;
} else if (sc->beacon.bslot[i])
bs_valid = true;
}
if (!bs_valid && (sc->sc_ah->imask & ATH9K_INT_SWBA)) {
/* Disable SWBA interrupt */
sc->sc_ah->imask &= ~ATH9K_INT_SWBA;
if (sc->nbcnvifs) {
/* Re-enable SWBA interrupt */
sc->sc_ah->imask |= ATH9K_INT_SWBA;
ath9k_ps_wakeup(sc);
ath9k_hw_set_interrupts(sc->sc_ah, sc->sc_ah->imask);
ath9k_ps_restore(sc);