[041/289] ath9k: lock reset and PCU start/stopping

Greg KH
2010-12-08T00:59:38Z

From: Luis R. Rodriguez <lrodriguez@atheros.com>

commit 5e848f789d60000d39d9a5f26ab02dbdd963f6cd upstream.

Apart from locking the start and stop PCU we need
to ensure we also content starting and stopping the PCU
between hardware resets.

This is part of a series that will help resolve the bug:

https://bugzilla.kernel.org/show_bug.cgi?id=14624

For more details about this issue refer to:

http://marc.info/?l=linux-wireless&m=128629803703756&w=2

Cc: Ben Greear <greearb@candelatech.com>
Cc: Kyungwan Nam <kyungwan.nam@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/net/wireless/ath/ath9k/main.c | 27 +++++++++++++++++++++++++++
drivers/net/wireless/ath/ath9k/recv.c | 2 --
2 files changed, 27 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -213,6 +213,9 @@ int ath_set_channel(struct ath_softc *sc
*/
ath9k_hw_set_interrupts(ah, 0);
ath_drain_all_txq(sc, false);
+
+ spin_lock_bh(&sc->rx.pcu_lock);
+
stopped = ath_stoprecv(sc);

/* XXX: do not flush receive queue here. We don't want
@@ -239,6 +242,7 @@ int ath_set_channel(struct ath_softc *sc
"reset status %d\n",
channel->center_freq, r);
spin_unlock_bh(&sc->sc_resetlock);
+ spin_unlock_bh(&sc->rx.pcu_lock);
goto ps_restore;
}
spin_unlock_bh(&sc->sc_resetlock);
@@ -247,9 +251,12 @@ int ath_set_channel(struct ath_softc *sc
ath_print(common, ATH_DBG_FATAL,
"Unable to restart recv logic\n");
r = -EIO;
+ spin_unlock_bh(&sc->rx.pcu_lock);
goto ps_restore;
}

+ spin_unlock_bh(&sc->rx.pcu_lock);
+
ath_cache_conf_rate(sc, &hw->conf);
ath_update_txpow(sc);
ath9k_hw_set_interrupts(ah, ah->imask);
@@ -840,6 +847,7 @@ void ath_radio_enable(struct ath_softc *
if (!ah->curchan)
ah->curchan = ath_get_curchannel(sc, sc->hw);

+ spin_lock_bh(&sc->rx.pcu_lock);
spin_lock_bh(&sc->sc_resetlock);
r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
if (r) {
@@ -854,8 +862,10 @@ void ath_radio_enable(struct ath_softc *
if (ath_startrecv(sc) != 0) {
ath_print(common, ATH_DBG_FATAL,
"Unable to restart recv logic\n");
+ spin_unlock_bh(&sc->rx.pcu_lock);
return;
}
+ spin_unlock_bh(&sc->rx.pcu_lock);

if (sc->sc_flags & SC_OP_BEACONS)
ath_beacon_config(sc, NULL); /* restart beacons */
@@ -894,6 +904,9 @@ void ath_radio_disable(struct ath_softc
ath9k_hw_set_interrupts(ah, 0);

ath_drain_all_txq(sc, false); /* clear pending tx frames */
+
+ spin_lock_bh(&sc->rx.pcu_lock);
+
ath_stoprecv(sc); /* turn off frame recv */
ath_flushrecv(sc); /* flush recv queue */

@@ -911,6 +924,9 @@ void ath_radio_disable(struct ath_softc
spin_unlock_bh(&sc->sc_resetlock);

ath9k_hw_phy_disable(ah);
+
+ spin_unlock_bh(&sc->rx.pcu_lock);
+
ath9k_hw_configpcipowersave(ah, 1, 1);
ath9k_ps_restore(sc);
ath9k_setpower(sc, ATH9K_PM_FULL_SLEEP);
@@ -930,6 +946,9 @@ int ath_reset(struct ath_softc *sc, bool

ath9k_hw_set_interrupts(ah, 0);
ath_drain_all_txq(sc, retry_tx);
+
+ spin_lock_bh(&sc->rx.pcu_lock);
+
ath_stoprecv(sc);
ath_flushrecv(sc);

@@ -944,6 +963,8 @@ int ath_reset(struct ath_softc *sc, bool
ath_print(common, ATH_DBG_FATAL,
"Unable to start recv logic\n");

+ spin_unlock_bh(&sc->rx.pcu_lock);
+
/*
* We may be doing a reset in response to a request
* that changes the channel so update any state that
@@ -1108,6 +1129,7 @@ static int ath9k_start(struct ieee80211_
* be followed by initialization of the appropriate bits
* and then setup of the interrupt mask.
*/
+ spin_lock_bh(&sc->rx.pcu_lock);
spin_lock_bh(&sc->sc_resetlock);
r = ath9k_hw_reset(ah, init_channel, ah->caldata, false);
if (r) {
@@ -1116,6 +1138,7 @@ static int ath9k_start(struct ieee80211_
"(freq %u MHz)\n", r,
curchan->center_freq);
spin_unlock_bh(&sc->sc_resetlock);
+ spin_unlock_bh(&sc->rx.pcu_lock);
goto mutex_unlock;
}
spin_unlock_bh(&sc->sc_resetlock);
@@ -1137,8 +1160,10 @@ static int ath9k_start(struct ieee80211_
ath_print(common, ATH_DBG_FATAL,
"Unable to start recv logic\n");
r = -EIO;
+ spin_unlock_bh(&sc->rx.pcu_lock);
goto mutex_unlock;
}
+ spin_unlock_bh(&sc->rx.pcu_lock);

/* Setup our intr mask. */
ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL |
@@ -1340,12 +1365,14 @@ static void ath9k_stop(struct ieee80211_
* before setting the invalid flag. */
ath9k_hw_set_interrupts(ah, 0);

+ spin_lock_bh(&sc->rx.pcu_lock);
if (!(sc->sc_flags & SC_OP_INVALID)) {
ath_drain_all_txq(sc, false);
ath_stoprecv(sc);
ath9k_hw_phy_disable(ah);
} else
sc->rx.rxlink = NULL;
+ spin_unlock_bh(&sc->rx.pcu_lock);

/* disable HAL and put h/w to sleep */
ath9k_hw_disable(ah);
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -523,13 +523,11 @@ bool ath_stoprecv(struct ath_softc *sc)

void ath_flushrecv(struct ath_softc *sc)
{
- spin_lock_bh(&sc->rx.pcu_lock);
sc->sc_flags |= SC_OP_RXFLUSH;
if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
ath_rx_tasklet(sc, 1, true);
ath_rx_tasklet(sc, 1, false);
sc->sc_flags &= ~SC_OP_RXFLUSH;
- spin_unlock_bh(&sc->rx.pcu_lock);
}

static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)