ath9k: serialize ath9k_hw_setpower calls

Because ath9k_setpower is called from various contexts, we have to
protect it against concurrent calls.

Changes-licensed-under: ISC
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 16 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 20bf4a7f896d..b37eb592b524 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -559,6 +559,7 @@ struct ath_softc {
         spinlock_t sc_resetlock;
         spinlock_t sc_serial_rw;
         spinlock_t ani_lock;
+        spinlock_t sc_pm_lock;
         struct mutex mutex;
 
         u8 curbssid[ETH_ALEN];
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index a115c8ceabe3..6740a6b98a62 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2728,7 +2728,8 @@ static bool ath9k_hw_set_power_awake(struct ath_hw *ah, int setChip)
         return true;
 }
 
-bool ath9k_hw_setpower(struct ath_hw *ah, enum ath9k_power_mode mode)
+static bool ath9k_hw_setpower_nolock(struct ath_hw *ah,
+                                     enum ath9k_power_mode mode)
 {
         int status = true, setChip = true;
         static const char *modes[] = {
@@ -2762,6 +2763,18 @@ bool ath9k_hw_setpower(struct ath_hw *ah, enum ath9k_power_mode mode)
         return status;
 }
 
+bool ath9k_hw_setpower(struct ath_hw *ah, enum ath9k_power_mode mode)
+{
+        unsigned long flags;
+        bool ret;
+
+        spin_lock_irqsave(&ah->ah_sc->sc_pm_lock, flags);
+        ret = ath9k_hw_setpower_nolock(ah, mode);
+        spin_unlock_irqrestore(&ah->ah_sc->sc_pm_lock, flags);
+
+        return ret;
+}
+
 /*
  * Helper for ASPM support.
  *
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 90cecce8d5ff..d14f8c9cef68 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1316,6 +1316,7 @@ static int ath_init(u16 devid, struct ath_softc *sc)
         spin_lock_init(&sc->sc_resetlock);
         spin_lock_init(&sc->sc_serial_rw);
         spin_lock_init(&sc->ani_lock);
+        spin_lock_init(&sc->sc_pm_lock);
         mutex_init(&sc->mutex);
         tasklet_init(&sc->intr_tq, ath9k_tasklet, (unsigned long)sc);
         tasklet_init(&sc->bcon_tasklet, ath_beacon_tasklet,