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ath9k: fix false positives in the baseband hang check

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ath9k_hw_check_alive() occasionally returns false, as the hardware
is still processing data in a specific state. Fix this issue by
repeating the test a few times with longer delay inbetween attempts.
This gets rid of excessive hardware resets that appear frequently on
some AR9132 based devices, but could also happen on AR9280.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Reported-by: Björn Smedman <bjorn.smedman@venatech.se>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2010-07-02 00:09:52 +02:00 committed by John W. Linville
parent 54bd5006b0
commit 347809fc2c
3 changed files with 28 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -428,6 +428,7 @@ int ath_beaconq_config(struct ath_softc *sc);
#define ATH_PAPRD_TIMEOUT 100 /* msecs */
void ath_hw_check(struct work_struct *work);
void ath_paprd_calibrate(struct work_struct *work);
void ath_ani_calibrate(unsigned long data);
@ -562,6 +563,7 @@ struct ath_softc {
spinlock_t sc_pm_lock;
struct mutex mutex;
struct work_struct paprd_work;
struct work_struct hw_check_work;
struct completion paprd_complete;
u32 intrstatus;

1
drivers/net/wireless/ath/ath9k/init.c
View File

@ -718,6 +718,7 @@ int ath9k_init_device(u16 devid, struct ath_softc *sc, u16 subsysid,
goto error_world;
}
INIT_WORK(&sc->hw_check_work, ath_hw_check);
INIT_WORK(&sc->paprd_work, ath_paprd_calibrate);
INIT_WORK(&sc->chan_work, ath9k_wiphy_chan_work);
INIT_DELAYED_WORK(&sc->wiphy_work, ath9k_wiphy_work);

27
drivers/net/wireless/ath/ath9k/main.c
View File

@ -515,6 +515,25 @@ static void ath_node_detach(struct ath_softc *sc, struct ieee80211_sta *sta)
ath_tx_node_cleanup(sc, an);
}
void ath_hw_check(struct work_struct *work)
{
struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
int i;
ath9k_ps_wakeup(sc);
for (i = 0; i < 3; i++) {
if (ath9k_hw_check_alive(sc->sc_ah))
goto out;
msleep(1);
}
ath_reset(sc, false);
out:
ath9k_ps_restore(sc);
}
void ath9k_tasklet(unsigned long data)
{
struct ath_softc *sc = (struct ath_softc *)data;
@ -526,13 +545,15 @@ void ath9k_tasklet(unsigned long data)
ath9k_ps_wakeup(sc);
if ((status & ATH9K_INT_FATAL) ||
!ath9k_hw_check_alive(ah)) {
if (status & ATH9K_INT_FATAL) {
ath_reset(sc, false);
ath9k_ps_restore(sc);
return;
}
if (!ath9k_hw_check_alive(ah))
ieee80211_queue_work(sc->hw, &sc->hw_check_work);
if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
rxmask = (ATH9K_INT_RXHP | ATH9K_INT_RXLP | ATH9K_INT_RXEOL |
ATH9K_INT_RXORN);
@ -1253,6 +1274,7 @@ static void ath9k_stop(struct ieee80211_hw *hw)
cancel_delayed_work_sync(&sc->tx_complete_work);
cancel_work_sync(&sc->paprd_work);
cancel_work_sync(&sc->hw_check_work);
if (!sc->num_sec_wiphy) {
cancel_delayed_work_sync(&sc->wiphy_work);
@ -1976,6 +1998,7 @@ static void ath9k_sw_scan_start(struct ieee80211_hw *hw)
sc->sc_flags |= SC_OP_SCANNING;
del_timer_sync(&common->ani.timer);
cancel_work_sync(&sc->paprd_work);
cancel_work_sync(&sc->hw_check_work);
cancel_delayed_work_sync(&sc->tx_complete_work);
mutex_unlock(&sc->mutex);
}