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ath9k: Handle abnormal NAV in AP mode

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Beacon transmission would get stuck if the NAV is
an invalid value for some reason. Check and correct
the NAV value in the HW when this happens.

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 2013-09-11 21:30:27 +05:30 committed by John W. Linville
parent 9ef4893234
commit 1e516ca7c9
3 changed files with 16 additions and 0 deletions
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2
drivers/net/wireless/ath/ath9k/beacon.c
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@ -334,6 +334,8 @@ void ath9k_beacon_tasklet(unsigned long data)
if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
sc->beacon.bmisscnt++;
ath9k_hw_check_nav(ah);
if (!ath9k_hw_check_alive(ah))
ieee80211_queue_work(sc->hw, &sc->hw_check_work);

13
drivers/net/wireless/ath/ath9k/hw.c
View File

@ -1656,6 +1656,19 @@ static bool ath9k_hw_detect_mac_hang(struct ath_hw *ah)
return true;
}
void ath9k_hw_check_nav(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);
u32 val;
val = REG_READ(ah, AR_NAV);
if (val != 0xdeadbeef && val > 0x7fff) {
ath_dbg(common, BSTUCK, "Abnormal NAV: 0x%x\n", val);
REG_WRITE(ah, AR_NAV, 0);
}
}
EXPORT_SYMBOL(ath9k_hw_check_nav);
bool ath9k_hw_check_alive(struct ath_hw *ah)
{
int count = 50;

1
drivers/net/wireless/ath/ath9k/hw.h
View File

@ -1031,6 +1031,7 @@ void ath9k_hw_set11nmac2040(struct ath_hw *ah);
void ath9k_hw_beaconinit(struct ath_hw *ah, u32 next_beacon, u32 beacon_period);
void ath9k_hw_set_sta_beacon_timers(struct ath_hw *ah,
const struct ath9k_beacon_state *bs);
void ath9k_hw_check_nav(struct ath_hw *ah);
bool ath9k_hw_check_alive(struct ath_hw *ah);
bool ath9k_hw_setpower(struct ath_hw *ah, enum ath9k_power_mode mode);