ath9k: move the PCU lock to the sc structure

The PCU lock should be used to contend TX DMA as well,
this will be done next.

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@candelatech.com>
Cc: Kyungwan Nam <kyungwan.nam@atheros.com>
Cc: stable@kernel.org
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index cb9194a..61d4507 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -309,7 +309,6 @@ struct ath_rx {
        u8 rxotherant;
        u32 *rxlink;
        unsigned int rxfilter;
-       spinlock_t pcu_lock;
        spinlock_t rxbuflock;
        struct list_head rxbuf;
        struct ath_descdma rxdma;
@@ -601,6 +600,7 @@ struct ath_softc {
        int irq;
        spinlock_t sc_serial_rw;
        spinlock_t sc_pm_lock;
+       spinlock_t sc_pcu_lock;
        struct mutex mutex;
        struct work_struct paprd_work;
        struct work_struct hw_check_work;

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 341d587..463ac12 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -242,7 +242,7 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
        ath9k_hw_disable_interrupts(ah);
        ath_drain_all_txq(sc, false);
 
-       spin_lock_bh(&sc->rx.pcu_lock);
+       spin_lock_bh(&sc->sc_pcu_lock);
 
        stopped = ath_stoprecv(sc);
 
@@ -268,7 +268,7 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
                          "Unable to reset channel (%u MHz), "
                          "reset status %d\n",
                          channel->center_freq, r);
-               spin_unlock_bh(&sc->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
                goto ps_restore;
        }
 
@@ -276,11 +276,11 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
                ath_print(common, ATH_DBG_FATAL,
                          "Unable to restart recv logic\n");
                r = -EIO;
-               spin_unlock_bh(&sc->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
                goto ps_restore;
        }
 
-       spin_unlock_bh(&sc->rx.pcu_lock);
+       spin_unlock_bh(&sc->sc_pcu_lock);
 
        ath_update_txpow(sc);
        ath9k_hw_set_interrupts(ah, ah->imask);
@@ -615,7 +615,7 @@ void ath9k_tasklet(unsigned long data)
                rxmask = (ATH9K_INT_RX | ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
 
        if (status & rxmask) {
-               spin_lock_bh(&sc->rx.pcu_lock);
+               spin_lock_bh(&sc->sc_pcu_lock);
 
                /* Check for high priority Rx first */
                if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
@@ -623,7 +623,7 @@ void ath9k_tasklet(unsigned long data)
                        ath_rx_tasklet(sc, 0, true);
 
                ath_rx_tasklet(sc, 0, false);
-               spin_unlock_bh(&sc->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
        }
 
        if (status & ATH9K_INT_TX) {
@@ -881,7 +881,7 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw)
        if (!ah->curchan)
                ah->curchan = ath_get_curchannel(sc, sc->hw);
 
-       spin_lock_bh(&sc->rx.pcu_lock);
+       spin_lock_bh(&sc->sc_pcu_lock);
        r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
        if (r) {
                ath_print(common, ATH_DBG_FATAL,
@@ -894,10 +894,10 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw)
        if (ath_startrecv(sc) != 0) {
                ath_print(common, ATH_DBG_FATAL,
                          "Unable to restart recv logic\n");
-               spin_unlock_bh(&sc->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
                return;
        }
-       spin_unlock_bh(&sc->rx.pcu_lock);
+       spin_unlock_bh(&sc->sc_pcu_lock);
 
        if (sc->sc_flags & SC_OP_BEACONS)
                ath_beacon_config(sc, NULL);    /* restart beacons */
@@ -937,7 +937,7 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw)
 
        ath_drain_all_txq(sc, false);   /* clear pending tx frames */
 
-       spin_lock_bh(&sc->rx.pcu_lock);
+       spin_lock_bh(&sc->sc_pcu_lock);
 
        ath_stoprecv(sc);               /* turn off frame recv */
        ath_flushrecv(sc);              /* flush recv queue */
@@ -955,7 +955,7 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw)
 
        ath9k_hw_phy_disable(ah);
 
-       spin_unlock_bh(&sc->rx.pcu_lock);
+       spin_unlock_bh(&sc->sc_pcu_lock);
 
        ath9k_hw_configpcipowersave(ah, 1, 1);
        ath9k_ps_restore(sc);
@@ -977,7 +977,7 @@ int ath_reset(struct ath_softc *sc, bool retry_tx)
        ath9k_hw_disable_interrupts(ah);
        ath_drain_all_txq(sc, retry_tx);
 
-       spin_lock_bh(&sc->rx.pcu_lock);
+       spin_lock_bh(&sc->sc_pcu_lock);
 
        ath_stoprecv(sc);
        ath_flushrecv(sc);
@@ -991,7 +991,7 @@ int ath_reset(struct ath_softc *sc, bool retry_tx)
                ath_print(common, ATH_DBG_FATAL,
                          "Unable to start recv logic\n");
 
-       spin_unlock_bh(&sc->rx.pcu_lock);
+       spin_unlock_bh(&sc->sc_pcu_lock);
 
        /*
         * We may be doing a reset in response to a request
@@ -1155,14 +1155,14 @@ static int ath9k_start(struct ieee80211_hw *hw)
         * 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_pcu_lock);
        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->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
                goto mutex_unlock;
        }
 
@@ -1183,10 +1183,10 @@ static int ath9k_start(struct ieee80211_hw *hw)
                ath_print(common, ATH_DBG_FATAL,
                          "Unable to start recv logic\n");
                r = -EIO;
-               spin_unlock_bh(&sc->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
                goto mutex_unlock;
        }
-       spin_unlock_bh(&sc->rx.pcu_lock);
+       spin_unlock_bh(&sc->sc_pcu_lock);
 
        /* Setup our intr mask. */
        ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL |
@@ -1387,14 +1387,14 @@ static void ath9k_stop(struct ieee80211_hw *hw)
 
        if (!(sc->sc_flags & SC_OP_INVALID)) {
                ath_drain_all_txq(sc, false);
-               spin_lock_bh(&sc->rx.pcu_lock);
+               spin_lock_bh(&sc->sc_pcu_lock);
                ath_stoprecv(sc);
                ath9k_hw_phy_disable(ah);
-               spin_unlock_bh(&sc->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
        } else {
-               spin_lock_bh(&sc->rx.pcu_lock);
+               spin_lock_bh(&sc->sc_pcu_lock);
                sc->rx.rxlink = NULL;
-               spin_unlock_bh(&sc->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
        }
 
        /* disable HAL and put h/w to sleep */

diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 87fabf8..60300b2 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -317,7 +317,7 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
        struct ath_buf *bf;
        int error = 0;
 
-       spin_lock_init(&sc->rx.pcu_lock);
+       spin_lock_init(&sc->sc_pcu_lock);
        sc->sc_flags &= ~SC_OP_RXFLUSH;
        spin_lock_init(&sc->rx.rxbuflock);
 

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index e662eca..d97b7a3 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1148,13 +1148,13 @@ void ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
                ath_print(common, ATH_DBG_FATAL,
                          "Failed to stop TX DMA. Resetting hardware!\n");
 
-               spin_lock_bh(&sc->rx.pcu_lock);
+               spin_lock_bh(&sc->sc_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->rx.pcu_lock);
+               spin_unlock_bh(&sc->sc_pcu_lock);
        }
 
        for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {