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Date: Tue, 15 Feb 2011 16:20:21 -0800
From: Greg KH <gregkh@...e.de>
To: linux-kernel@...r.kernel.org, stable@...nel.org
Cc: stable-review@...nel.org, torvalds@...ux-foundation.org,
akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
Kyungwan Nam <kyungwan.nam@...eros.com>,
"Luis R. Rodriguez" <lrodriguez@...eros.com>,
"John W. Linville" <linville@...driver.com>
Subject: [patch 053/176] ath9k: simplify hw reset locking
2.6.36-stable review patch. If anyone has any objections, please let us know.
------------------
From: Luis R. Rodriguez <lrodriguez@...eros.com>
commit 9d94674ab754be0e275120a183670ead435f9c0d upstream.
The new PCU lock is better placed so we can just contend
against that when trying to reset hardware.
This is part of a series of patches which fix stopping
TX DMA completley when requested on the driver.
For more details about this issue refer to this thread:
http://marc.info/?l=linux-wireless&m=128629803703756&w=2
Tested-by: Ben Greear <greearb@...delatech.com>
Cc: Kyungwan Nam <kyungwan.nam@...eros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@...eros.com>
Signed-off-by: John W. Linville <linville@...driver.com>
---
drivers/net/wireless/ath/ath9k/ath9k.h | 1 -
drivers/net/wireless/ath/ath9k/init.c | 1 -
drivers/net/wireless/ath/ath9k/main.c | 22 ++++++----------------
drivers/net/wireless/ath/ath9k/xmit.c | 4 ++--
4 files changed, 8 insertions(+), 20 deletions(-)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -557,7 +557,6 @@ struct ath_softc {
struct ath_hw *sc_ah;
void __iomem *mem;
int irq;
- spinlock_t sc_resetlock;
spinlock_t sc_serial_rw;
spinlock_t sc_pm_lock;
struct mutex mutex;
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -574,7 +574,6 @@ static int ath9k_init_softc(u16 devid, s
common->debug_mask = ath9k_debug;
spin_lock_init(&sc->wiphy_lock);
- spin_lock_init(&sc->sc_resetlock);
spin_lock_init(&sc->sc_serial_rw);
spin_lock_init(&sc->sc_pm_lock);
mutex_init(&sc->mutex);
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -233,19 +233,15 @@ int ath_set_channel(struct ath_softc *sc
sc->sc_ah->curchan->channel,
channel->center_freq, conf_is_ht40(conf));
- spin_lock_bh(&sc->sc_resetlock);
-
r = ath9k_hw_reset(ah, hchan, caldata, fastcc);
if (r) {
ath_print(common, ATH_DBG_FATAL,
"Unable to reset channel (%u MHz), "
"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);
if (ath_startrecv(sc) != 0) {
ath_print(common, ATH_DBG_FATAL,
@@ -848,7 +844,6 @@ void ath_radio_enable(struct ath_softc *
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) {
ath_print(common, ATH_DBG_FATAL,
@@ -856,7 +851,6 @@ void ath_radio_enable(struct ath_softc *
"reset status %d\n",
channel->center_freq, r);
}
- spin_unlock_bh(&sc->sc_resetlock);
ath_update_txpow(sc);
if (ath_startrecv(sc) != 0) {
@@ -913,7 +907,6 @@ void ath_radio_disable(struct ath_softc
if (!ah->curchan)
ah->curchan = ath_get_curchannel(sc, hw);
- spin_lock_bh(&sc->sc_resetlock);
r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
if (r) {
ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
@@ -921,7 +914,6 @@ void ath_radio_disable(struct ath_softc
"reset status %d\n",
channel->center_freq, r);
}
- spin_unlock_bh(&sc->sc_resetlock);
ath9k_hw_phy_disable(ah);
@@ -952,12 +944,10 @@ int ath_reset(struct ath_softc *sc, bool
ath_stoprecv(sc);
ath_flushrecv(sc);
- spin_lock_bh(&sc->sc_resetlock);
r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false);
if (r)
ath_print(common, ATH_DBG_FATAL,
"Unable to reset hardware; reset status %d\n", r);
- spin_unlock_bh(&sc->sc_resetlock);
if (ath_startrecv(sc) != 0)
ath_print(common, ATH_DBG_FATAL,
@@ -1130,18 +1120,15 @@ static int ath9k_start(struct ieee80211_
* 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) {
ath_print(common, ATH_DBG_FATAL,
"Unable to reset hardware; reset status %d "
"(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);
/*
* This is needed only to setup initial state
@@ -1365,14 +1352,17 @@ 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);
+ spin_lock_bh(&sc->rx.pcu_lock);
ath_stoprecv(sc);
ath9k_hw_phy_disable(ah);
- } else
+ spin_unlock_bh(&sc->rx.pcu_lock);
+ } else {
+ spin_lock_bh(&sc->rx.pcu_lock);
sc->rx.rxlink = NULL;
- spin_unlock_bh(&sc->rx.pcu_lock);
+ 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/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1160,13 +1160,13 @@ void ath_drain_all_txq(struct ath_softc
ath_print(common, ATH_DBG_FATAL,
"Failed to stop TX DMA. Resetting hardware!\n");
- spin_lock_bh(&sc->sc_resetlock);
+ spin_lock_bh(&sc->rx.pcu_lock);
r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false);
if (r)
ath_print(common, ATH_DBG_FATAL,
"Unable to reset hardware; reset status %d\n",
r);
- spin_unlock_bh(&sc->sc_resetlock);
+ spin_unlock_bh(&sc->rx.pcu_lock);
}
for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
--
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