package/mac80211/patches/530-ath9k_locking_fix.patch

   1 --- a/drivers/net/wireless/ath/ath9k/ath9k.h
   2 +++ b/drivers/net/wireless/ath/ath9k/ath9k.h
   3 @@ -309,8 +309,8 @@ struct ath_rx {
   4         u8 rxotherant;
   5         u32 *rxlink;
   6         unsigned int rxfilter;
   7 -       spinlock_t rxflushlock;
   8         spinlock_t rxbuflock;
   9 +       spinlock_t pcu_lock;
  10         struct list_head rxbuf;
  11         struct ath_descdma rxdma;
  12         struct ath_buf *rx_bufptr;
  13 --- a/drivers/net/wireless/ath/ath9k/main.c
  14 +++ b/drivers/net/wireless/ath/ath9k/main.c
  15 @@ -239,6 +239,9 @@ int ath_set_channel(struct ath_softc *sc
  16          */
  17         ath9k_hw_disable_interrupts(ah);
  18         ath_drain_all_txq(sc, false);
  19 +
  20 +       spin_lock_bh(&sc->rx.pcu_lock);
  21 +
  22         stopped = ath_stoprecv(sc);
  23
  24         /* XXX: do not flush receive queue here. We don't want
  25 @@ -266,6 +269,7 @@ int ath_set_channel(struct ath_softc *sc
  26                           "reset status %d\n",
  27                           channel->center_freq, r);
  28                 spin_unlock_bh(&sc->sc_resetlock);
  29 +               spin_unlock_bh(&sc->rx.pcu_lock);
  30                 goto ps_restore;
  31         }
  32         spin_unlock_bh(&sc->sc_resetlock);
  33 @@ -274,9 +278,12 @@ int ath_set_channel(struct ath_softc *sc
  34                 ath_print(common, ATH_DBG_FATAL,
  35                           "Unable to restart recv logic\n");
  36                 r = -EIO;
  37 +               spin_unlock_bh(&sc->rx.pcu_lock);
  38                 goto ps_restore;
  39         }
  40
  41 +       spin_unlock_bh(&sc->rx.pcu_lock);
  42 +
  43         ath_update_txpow(sc);
  44         ath9k_hw_set_interrupts(ah, ah->imask);
  45
  46 @@ -610,7 +617,7 @@ void ath9k_tasklet(unsigned long data)
  47                 rxmask = (ATH9K_INT_RX | ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
  48
  49         if (status & rxmask) {
  50 -               spin_lock_bh(&sc->rx.rxflushlock);
  51 +               spin_lock_bh(&sc->rx.pcu_lock);
  52
  53                 /* Check for high priority Rx first */
  54                 if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
  55 @@ -618,7 +625,7 @@ void ath9k_tasklet(unsigned long data)
  56                         ath_rx_tasklet(sc, 0, true);
  57
  58                 ath_rx_tasklet(sc, 0, false);
  59 -               spin_unlock_bh(&sc->rx.rxflushlock);
  60 +               spin_unlock_bh(&sc->rx.pcu_lock);
  61         }
  62
  63         if (status & ATH9K_INT_TX) {
  64 @@ -876,6 +883,7 @@ void ath_radio_enable(struct ath_softc *
  65         if (!ah->curchan)
  66                 ah->curchan = ath_get_curchannel(sc, sc->hw);
  67
  68 +       spin_lock_bh(&sc->rx.pcu_lock);
  69         spin_lock_bh(&sc->sc_resetlock);
  70         r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false);
  71         if (r) {
  72 @@ -890,8 +898,10 @@ void ath_radio_enable(struct ath_softc *
  73         if (ath_startrecv(sc) != 0) {
  74                 ath_print(common, ATH_DBG_FATAL,
  75                           "Unable to restart recv logic\n");
  76 +               spin_unlock_bh(&sc->rx.pcu_lock);
  77                 return;
  78         }
  79 +       spin_unlock_bh(&sc->rx.pcu_lock);
  80
  81         if (sc->sc_flags & SC_OP_BEACONS)
  82                 ath_beacon_config(sc, NULL);    /* restart beacons */
  83 @@ -930,6 +940,9 @@ void ath_radio_disable(struct ath_softc
  84         ath9k_hw_disable_interrupts(ah);
  85
  86         ath_drain_all_txq(sc, false);   /* clear pending tx frames */
  87 +
  88 +       spin_lock_bh(&sc->rx.pcu_lock);
  89 +
  90         ath_stoprecv(sc);               /* turn off frame recv */
  91         ath_flushrecv(sc);              /* flush recv queue */
  92
  93 @@ -947,6 +960,9 @@ void ath_radio_disable(struct ath_softc
  94         spin_unlock_bh(&sc->sc_resetlock);
  95
  96         ath9k_hw_phy_disable(ah);
  97 +
  98 +       spin_unlock_bh(&sc->rx.pcu_lock);
  99 +
 100         ath9k_hw_configpcipowersave(ah, 1, 1);
 101         ath9k_ps_restore(sc);
 102         ath9k_setpower(sc, ATH9K_PM_FULL_SLEEP);
 103 @@ -966,6 +982,9 @@ int ath_reset(struct ath_softc *sc, bool
 104
 105         ath9k_hw_disable_interrupts(ah);
 106         ath_drain_all_txq(sc, retry_tx);
 107 +
 108 +       spin_lock_bh(&sc->rx.pcu_lock);
 109 +
 110         ath_stoprecv(sc);
 111         ath_flushrecv(sc);
 112
 113 @@ -980,6 +999,8 @@ int ath_reset(struct ath_softc *sc, bool
 114                 ath_print(common, ATH_DBG_FATAL,
 115                           "Unable to start recv logic\n");
 116
 117 +       spin_unlock_bh(&sc->rx.pcu_lock);
 118 +
 119         /*
 120          * We may be doing a reset in response to a request
 121          * that changes the channel so update any state that
 122 @@ -1142,6 +1163,7 @@ static int ath9k_start(struct ieee80211_
 123          * be followed by initialization of the appropriate bits
 124          * and then setup of the interrupt mask.
 125          */
 126 +       spin_lock_bh(&sc->rx.pcu_lock);
 127         spin_lock_bh(&sc->sc_resetlock);
 128         r = ath9k_hw_reset(ah, init_channel, ah->caldata, false);
 129         if (r) {
 130 @@ -1150,6 +1172,7 @@ static int ath9k_start(struct ieee80211_
 131                           "(freq %u MHz)\n", r,
 132                           curchan->center_freq);
 133                 spin_unlock_bh(&sc->sc_resetlock);
 134 +               spin_unlock_bh(&sc->rx.pcu_lock);
 135                 goto mutex_unlock;
 136         }
 137         spin_unlock_bh(&sc->sc_resetlock);
 138 @@ -1171,8 +1194,10 @@ static int ath9k_start(struct ieee80211_
 139                 ath_print(common, ATH_DBG_FATAL,
 140                           "Unable to start recv logic\n");
 141                 r = -EIO;
 142 +               spin_unlock_bh(&sc->rx.pcu_lock);
 143                 goto mutex_unlock;
 144         }
 145 +       spin_unlock_bh(&sc->rx.pcu_lock);
 146
 147         /* Setup our intr mask. */
 148         ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL |
 149 @@ -1371,12 +1396,14 @@ static void ath9k_stop(struct ieee80211_
 150          * before setting the invalid flag. */
 151         ath9k_hw_disable_interrupts(ah);
 152
 153 +       spin_lock_bh(&sc->rx.pcu_lock);
 154         if (!(sc->sc_flags & SC_OP_INVALID)) {
 155                 ath_drain_all_txq(sc, false);
 156                 ath_stoprecv(sc);
 157                 ath9k_hw_phy_disable(ah);
 158         } else
 159                 sc->rx.rxlink = NULL;
 160 +       spin_unlock_bh(&sc->rx.pcu_lock);
 161
 162         /* disable HAL and put h/w to sleep */
 163         ath9k_hw_disable(ah);
 164 --- a/drivers/net/wireless/ath/ath9k/recv.c
 165 +++ b/drivers/net/wireless/ath/ath9k/recv.c
 166 @@ -297,19 +297,17 @@ static void ath_edma_start_recv(struct a
 167         ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP,
 168                               sc->rx.rx_edma[ATH9K_RX_QUEUE_LP].rx_fifo_hwsize);
 169
 170 -       spin_unlock_bh(&sc->rx.rxbuflock);
 171 -
 172         ath_opmode_init(sc);
 173
 174         ath9k_hw_startpcureceive(sc->sc_ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
 175 +
 176 +       spin_unlock_bh(&sc->rx.rxbuflock);
 177  }
 178
 179  static void ath_edma_stop_recv(struct ath_softc *sc)
 180  {
 181 -       spin_lock_bh(&sc->rx.rxbuflock);
 182         ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
 183         ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
 184 -       spin_unlock_bh(&sc->rx.rxbuflock);
 185  }
 186
 187  int ath_rx_init(struct ath_softc *sc, int nbufs)
 188 @@ -319,8 +317,8 @@ int ath_rx_init(struct ath_softc *sc, in
 189         struct ath_buf *bf;
 190         int error = 0;
 191
 192 -       spin_lock_init(&sc->rx.rxflushlock);
 193         sc->sc_flags &= ~SC_OP_RXFLUSH;
 194 +       spin_lock_init(&sc->rx.pcu_lock);
 195         spin_lock_init(&sc->rx.rxbuflock);
 196
 197         if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
 198 @@ -506,9 +504,9 @@ int ath_startrecv(struct ath_softc *sc)
 199         ath9k_hw_rxena(ah);
 200
 201  start_recv:
 202 -       spin_unlock_bh(&sc->rx.rxbuflock);
 203         ath_opmode_init(sc);
 204         ath9k_hw_startpcureceive(ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
 205 +       spin_unlock_bh(&sc->rx.rxbuflock);
 206
 207         return 0;
 208  }
 209 @@ -518,6 +516,7 @@ bool ath_stoprecv(struct ath_softc *sc)
 210         struct ath_hw *ah = sc->sc_ah;
 211         bool stopped;
 212
 213 +       spin_lock_bh(&sc->rx.rxbuflock);
 214         ath9k_hw_stoppcurecv(ah);
 215         ath9k_hw_setrxfilter(ah, 0);
 216         stopped = ath9k_hw_stopdmarecv(ah);
 217 @@ -526,19 +525,18 @@ bool ath_stoprecv(struct ath_softc *sc)
 218                 ath_edma_stop_recv(sc);
 219         else
 220                 sc->rx.rxlink = NULL;
 221 +       spin_unlock_bh(&sc->rx.rxbuflock);
 222
 223         return stopped;
 224  }
 225
 226  void ath_flushrecv(struct ath_softc *sc)
 227  {
 228 -       spin_lock_bh(&sc->rx.rxflushlock);
 229         sc->sc_flags |= SC_OP_RXFLUSH;
 230         if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
 231                 ath_rx_tasklet(sc, 1, true);
 232         ath_rx_tasklet(sc, 1, false);
 233         sc->sc_flags &= ~SC_OP_RXFLUSH;
 234 -       spin_unlock_bh(&sc->rx.rxflushlock);
 235  }
 236
 237  static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)