[RFC] ath9k: fix race conditions when stop device

[Stanislaw Gruszka <sgruszka@redhat.com>]

We do not kill any scheduled tasklets when stopping device, that may
cause usage of resources after free. Moreover we enable interrupts
in tasklet function, so we could potentially end with interrupts
enabled when driver is not ready to receive them.

I think patch could fix Ben's kernel crash from:
http://marc.info/?l=linux-wireless&m=129438358921501&w=2

RFC for now as I'm not quite familiar with ath9k. If get confirmation
patch is correct, I will repost and cc to -stable.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
 drivers/net/wireless/ath/ath9k/init.c |    5 -----
 drivers/net/wireless/ath/ath9k/main.c |    9 +++++++++
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 767d8b8..b3254a3 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -598,8 +598,6 @@ err_btcoex:
 err_queues:
 	ath9k_hw_deinit(ah);
 err_hw:
-	tasklet_kill(&sc->intr_tq);
-	tasklet_kill(&sc->bcon_tasklet);
 
 	kfree(ah);
 	sc->sc_ah = NULL;
@@ -807,9 +805,6 @@ static void ath9k_deinit_softc(struct ath_softc *sc)
 
 	ath9k_hw_deinit(sc->sc_ah);
 
-	tasklet_kill(&sc->intr_tq);
-	tasklet_kill(&sc->bcon_tasklet);
-
 	kfree(sc->sc_ah);
 	sc->sc_ah = NULL;
 }
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index c03184e..42cfd96 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1320,6 +1320,9 @@ static void ath9k_stop(struct ieee80211_hw *hw)
 
 	spin_lock_bh(&sc->sc_pcu_lock);
 
+	/* prevent tasklets to enable interrupts once we disable them */
+	ah->imask &= ~ATH9K_INT_GLOBAL;
+
 	/* make sure h/w will not generate any interrupt
 	 * before setting the invalid flag. */
 	ath9k_hw_disable_interrupts(ah);
@@ -1337,6 +1340,12 @@ static void ath9k_stop(struct ieee80211_hw *hw)
 
 	spin_unlock_bh(&sc->sc_pcu_lock);
 
+	/* we can now sync irq and kill any running tasklets, since we already
+	 * disabled interrupts and not holding a spin lock */
+	synchronize_irq(sc->irq);
+	tasklet_kill(&sc->intr_tq);
+	tasklet_kill(&sc->bcon_tasklet);
+
 	ath9k_ps_restore(sc);
 
 	sc->ps_idle = true;
-- 
1.7.1