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ath9k: race condition in SCANNING state check during ANI calibration

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ANI calibration shouldn't be done when we are not on our home channel.
This is already verified. However, it is racy. Fix this by proper
spin locks.

Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Senthil Balasubramanian 2009-06-24 18:56:41 +05:30 committed by John W. Linville
parent f38faa31e0
commit e5f0921a95
2 changed files with 8 additions and 4 deletions
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1
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -540,6 +540,7 @@ struct ath_softc {
int irq;
spinlock_t sc_resetlock;
spinlock_t sc_serial_rw;
spinlock_t ani_lock;
struct mutex mutex;
u8 curbssid[ETH_ALEN];

11
drivers/net/wireless/ath/ath9k/main.c
View File

@ -342,6 +342,7 @@ static void ath_ani_calibrate(unsigned long data)
* don't calibrate when we're scanning.
* we are most likely not on our home channel.
*/
spin_lock(&sc->ani_lock);
if (sc->sc_flags & SC_OP_SCANNING)
goto set_timer;
@ -405,6 +406,7 @@ static void ath_ani_calibrate(unsigned long data)
ath9k_ps_restore(sc);
set_timer:
spin_unlock(&sc->ani_lock);
/*
* Set timer interval based on previous results.
* The interval must be the shortest necessary to satisfy ANI,
@ -1310,6 +1312,7 @@ static int ath_init(u16 devid, struct ath_softc *sc)
spin_lock_init(&sc->wiphy_lock);
spin_lock_init(&sc->sc_resetlock);
spin_lock_init(&sc->sc_serial_rw);
spin_lock_init(&sc->ani_lock);
mutex_init(&sc->mutex);
tasklet_init(&sc->intr_tq, ath9k_tasklet, (unsigned long)sc);
tasklet_init(&sc->bcon_tasklet, ath_beacon_tasklet,
@ -2682,9 +2685,9 @@ static void ath9k_sw_scan_start(struct ieee80211_hw *hw)
aphy->state = ATH_WIPHY_SCAN;
ath9k_wiphy_pause_all_forced(sc, aphy);
mutex_lock(&sc->mutex);
spin_lock_bh(&sc->ani_lock);
sc->sc_flags |= SC_OP_SCANNING;
mutex_unlock(&sc->mutex);
spin_unlock_bh(&sc->ani_lock);
}
static void ath9k_sw_scan_complete(struct ieee80211_hw *hw)
@ -2692,11 +2695,11 @@ static void ath9k_sw_scan_complete(struct ieee80211_hw *hw)
struct ath_wiphy *aphy = hw->priv;
struct ath_softc *sc = aphy->sc;
mutex_lock(&sc->mutex);
spin_lock_bh(&sc->ani_lock);
aphy->state = ATH_WIPHY_ACTIVE;
sc->sc_flags &= ~SC_OP_SCANNING;
sc->sc_flags |= SC_OP_FULL_RESET;
mutex_unlock(&sc->mutex);
spin_unlock_bh(&sc->ani_lock);
}
struct ieee80211_ops ath9k_ops = {