[PATCH 0/3] ath9k patches

[PATCH 0/3] ath9k patches

[Sujith Manoharan]

From: Sujith Manoharan <c_manoha@qca.qualcomm.com>

Fixes related to reset.

Sujith Manoharan (3):
  ath9k: Unify reset API
  ath9k: Set ATH_OP_HW_RESET before HW reset
  ath9k: Disable beacon tasklet during reset

 drivers/net/wireless/ath/ath9k/ath9k.h   |  3 +--
 drivers/net/wireless/ath/ath9k/channel.c |  2 +-
 drivers/net/wireless/ath/ath9k/main.c    | 26 +++++++++++++++++++++-----
 drivers/net/wireless/ath/ath9k/tx99.c    |  4 ++--
 4 files changed, 25 insertions(+), 10 deletions(-)

-- 
2.1.2

[PATCH 1/3] ath9k: Unify reset API

[Sujith Manoharan]

From: Sujith Manoharan <c_manoha@qca.qualcomm.com>

Instead of having ath_reset_internal() and ath_reset()
as two separate calls to perform a HW reset, have
one function. This makes sure that the behavior will
be the same at all callsites.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
---
 drivers/net/wireless/ath/ath9k/ath9k.h   |  3 +--
 drivers/net/wireless/ath/ath9k/channel.c |  2 +-
 drivers/net/wireless/ath/ath9k/main.c    | 12 +++++++-----
 drivers/net/wireless/ath/ath9k/tx99.c    |  4 ++--
 4 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index aff5e4c..bc90fab 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -540,7 +540,6 @@ static inline void ath_chanctx_check_active(struct ath_softc *sc,
 
 #endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */
 
-int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan);
 void ath_startrecv(struct ath_softc *sc);
 bool ath_stoprecv(struct ath_softc *sc);
 u32 ath_calcrxfilter(struct ath_softc *sc);
@@ -1069,7 +1068,7 @@ void ath9k_tasklet(unsigned long data);
 int ath_cabq_update(struct ath_softc *);
 u8 ath9k_parse_mpdudensity(u8 mpdudensity);
 irqreturn_t ath_isr(int irq, void *dev);
-int ath_reset(struct ath_softc *sc);
+int ath_reset(struct ath_softc *sc, struct ath9k_channel *hchan);
 void ath_cancel_work(struct ath_softc *sc);
 void ath_restart_work(struct ath_softc *sc);
 int ath9k_init_device(u16 devid, struct ath_softc *sc,
diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c
index 135f74c..709facc 100644
--- a/drivers/net/wireless/ath/ath9k/channel.c
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -66,7 +66,7 @@ static int ath_set_channel(struct ath_softc *sc)
 	}
 
 	hchan = &sc->sc_ah->channels[pos];
-	r = ath_reset_internal(sc, hchan);
+	r = ath_reset(sc, hchan);
 	if (r)
 		return r;
 
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 446bc46..eb6ba9f 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -270,7 +270,7 @@ static bool ath_complete_reset(struct ath_softc *sc, bool start)
 	return true;
 }
 
-int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan)
+static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan)
 {
 	struct ath_hw *ah = sc->sc_ah;
 	struct ath_common *common = ath9k_hw_common(ah);
@@ -598,12 +598,12 @@ chip_reset:
 #undef SCHED_INTR
 }
 
-int ath_reset(struct ath_softc *sc)
+int ath_reset(struct ath_softc *sc, struct ath9k_channel *hchan)
 {
 	int r;
 
 	ath9k_ps_wakeup(sc);
-	r = ath_reset_internal(sc, NULL);
+	r = ath_reset_internal(sc, hchan);
 	ath9k_ps_restore(sc);
 
 	return r;
@@ -623,7 +623,9 @@ void ath_reset_work(struct work_struct *work)
 {
 	struct ath_softc *sc = container_of(work, struct ath_softc, hw_reset_work);
 
-	ath_reset(sc);
+	ath9k_ps_wakeup(sc);
+	ath_reset_internal(sc, NULL);
+	ath9k_ps_restore(sc);
 }
 
 /**********************/
@@ -2044,7 +2046,7 @@ void __ath9k_flush(struct ieee80211_hw *hw, u32 queues, bool drop)
 		spin_unlock_bh(&sc->sc_pcu_lock);
 
 		if (!drain_txq)
-			ath_reset(sc);
+			ath_reset(sc, NULL);
 
 		ath9k_ps_restore(sc);
 	}
diff --git a/drivers/net/wireless/ath/ath9k/tx99.c b/drivers/net/wireless/ath/ath9k/tx99.c
index 40ab65e..ac4781f 100644
--- a/drivers/net/wireless/ath/ath9k/tx99.c
+++ b/drivers/net/wireless/ath/ath9k/tx99.c
@@ -99,7 +99,7 @@ static struct sk_buff *ath9k_build_tx99_skb(struct ath_softc *sc)
 
 static void ath9k_tx99_deinit(struct ath_softc *sc)
 {
-	ath_reset(sc);
+	ath_reset(sc, NULL);
 
 	ath9k_ps_wakeup(sc);
 	ath9k_tx99_stop(sc);
@@ -127,7 +127,7 @@ static int ath9k_tx99_init(struct ath_softc *sc)
 	memset(&txctl, 0, sizeof(txctl));
 	txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
 
-	ath_reset(sc);
+	ath_reset(sc, NULL);
 
 	ath9k_ps_wakeup(sc);
 
-- 
2.1.2

[PATCH 2/3] ath9k: Set ATH_OP_HW_RESET before HW reset

[Sujith Manoharan]

From: Sujith Manoharan <c_manoha@qca.qualcomm.com>

When a HW reset is done, the interrupt tasklet is
disabled before ISRs are disabled in the HW. This
allows a small window where the HW can still generate
interrupts. Since the tasklet is disabled and not killed,
it is not scheduled but deferred for execution at a later
time.

This happens because ATH_OP_HW_RESET is not set when ath_reset()
is called. When the hw_reset_work workqueue is used, this
problem doesn't arise because ATH_OP_HW_RESET is set
and the ISR bails out.

Set ATH_OP_HW_RESET properly in ath_reset() to avoid
this race - all the ath_reset_internal() callers have
been converted to use ath_reset() in the previous patch.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
---
 drivers/net/wireless/ath/ath9k/main.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index eb6ba9f..dda09ba 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -598,10 +598,17 @@ chip_reset:
 #undef SCHED_INTR
 }
 
+/*
+ * This function is called when a HW reset cannot be deferred
+ * and has to be immediate.
+ */
 int ath_reset(struct ath_softc *sc, struct ath9k_channel *hchan)
 {
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	int r;
 
+	set_bit(ATH_OP_HW_RESET, &common->op_flags);
+
 	ath9k_ps_wakeup(sc);
 	r = ath_reset_internal(sc, hchan);
 	ath9k_ps_restore(sc);
@@ -609,6 +616,11 @@ int ath_reset(struct ath_softc *sc, struct ath9k_channel *hchan)
 	return r;
 }
 
+/*
+ * When a HW reset can be deferred, it is added to the
+ * hw_reset_work workqueue, but we set ATH_OP_HW_RESET before
+ * queueing.
+ */
 void ath9k_queue_reset(struct ath_softc *sc, enum ath_reset_type type)
 {
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
-- 
2.1.2

[PATCH 3/3] ath9k: Disable beacon tasklet during reset

[Sujith Manoharan]

From: Sujith Manoharan <c_manoha@qca.qualcomm.com>

When a chip reset is done, all running timers,
tasklets etc. are stopped but the beacon tasklet
is left running. Fix this.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
---
 drivers/net/wireless/ath/ath9k/main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index dda09ba..5d54f39 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -281,6 +281,7 @@ static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan)
 	__ath_cancel_work(sc);
 
 	tasklet_disable(&sc->intr_tq);
+	tasklet_disable(&sc->bcon_tasklet);
 	spin_lock_bh(&sc->sc_pcu_lock);
 
 	if (!sc->cur_chan->offchannel) {
@@ -326,6 +327,7 @@ static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan)
 
 out:
 	spin_unlock_bh(&sc->sc_pcu_lock);
+	tasklet_enable(&sc->bcon_tasklet);
 	tasklet_enable(&sc->intr_tq);
 
 	return r;
-- 
2.1.2