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ath9k: Fix work handling 

* Currently, there is no synchronization between the reset
  work and the tx-poll work. Fix this and make sure that we
  bail out properly if a reset work is in progress.

* Cleanup the PLL WAR and enable it for AR9340 too and
  use a helper for restarting work/timers after a reset.

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 2012-06-04 20:23:43 +05:30 committed by John W. Linville
parent ef1b6cd9a1
commit af68abadac
3 changed files with 37 additions and 19 deletions
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1
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -431,6 +431,7 @@ void ath9k_set_beaconing_status(struct ath_softc *sc, bool status);
#define ATH_RESTART_CALINTERVAL 1200000 /* 20 minutes */
#define ATH_PAPRD_TIMEOUT 100 /* msecs */
#define ATH_PLL_WORK_INTERVAL 100
void ath_tx_complete_poll_work(struct work_struct *work);
void ath_reset_work(struct work_struct *work);

25
drivers/net/wireless/ath/ath9k/link.c
View File

@ -52,6 +52,7 @@ void ath_tx_complete_poll_work(struct work_struct *work)
"tx hung, resetting the chip\n");
RESET_STAT_INC(sc, RESET_TYPE_TX_HANG);
ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
return;
}
ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work,
@ -107,9 +108,9 @@ void ath_hw_check(struct work_struct *work)
}
/*
* PLL-WAR for AR9485.
* PLL-WAR for AR9485/AR9340
*/
static void ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
static bool ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
{
static int count;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
@ -117,29 +118,33 @@ static void ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
if (pll_sqsum >= 0x40000) {
count++;
if (count == 3) {
/* Rx is hung for more than 500ms. Reset it */
ath_dbg(common, RESET, "Possible RX hang, resetting\n");
ath_dbg(common, RESET, "PLL WAR, resetting the chip\n");
RESET_STAT_INC(sc, RESET_TYPE_PLL_HANG);
ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
count = 0;
return true;
}
} else
} else {
count = 0;
}
return false;
}
void ath_hw_pll_work(struct work_struct *work)
{
u32 pll_sqsum;
struct ath_softc *sc = container_of(work, struct ath_softc,
hw_pll_work.work);
u32 pll_sqsum;
if (AR_SREV_9485(sc->sc_ah)) {
ath9k_ps_wakeup(sc);
pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
ath9k_ps_restore(sc);
ath_hw_pll_rx_hang_check(sc, pll_sqsum);
ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work, HZ/5);
}
if (ath_hw_pll_rx_hang_check(sc, pll_sqsum))
return;
ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
}
/*

22
drivers/net/wireless/ath/ath9k/main.c
View File

@ -158,6 +158,22 @@ static void ath_cancel_work(struct ath_softc *sc)
cancel_work_sync(&sc->hw_reset_work);
}
static void ath_restart_work(struct ath_softc *sc)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, 0);
if (AR_SREV_9485(sc->sc_ah) || AR_SREV_9340(sc->sc_ah))
ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
ath_start_rx_poll(sc, 3);
if (!common->disable_ani)
ath_start_ani(common);
}
static bool ath_prepare_reset(struct ath_softc *sc, bool retry_tx, bool flush)
{
struct ath_hw *ah = sc->sc_ah;
@ -209,11 +225,7 @@ static bool ath_complete_reset(struct ath_softc *sc, bool start)
if (sc->sc_flags & SC_OP_BEACONS)
ath_set_beacon(sc);
ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, 0);
ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work, HZ/2);
ath_start_rx_poll(sc, 3);
if (!common->disable_ani)
ath_start_ani(common);
ath_restart_work(sc);
}
if ((ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB) && sc->ant_rx != 3) {