1 files changed, 106 insertions, 37 deletions

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 8c24cd72aaca..a70827793086 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -729,6 +729,7 @@ static void b43_synchronize_irq(struct b43_wldev *dev)
  */
 void b43_dummy_transmission(struct b43_wldev *dev)
 {
+        struct b43_wl *wl = dev->wl;
         struct b43_phy *phy = &dev->phy;
         unsigned int i, max_loop;
         u16 value;
@@ -755,6 +756,9 @@ void b43_dummy_transmission(struct b43_wldev *dev)
                 return;
         }
 
+        spin_lock_irq(&wl->irq_lock);
+        write_lock(&wl->tx_lock);
+
         for (i = 0; i < 5; i++)
                 b43_ram_write(dev, i * 4, buffer[i]);
 
@@ -795,6 +799,9 @@ void b43_dummy_transmission(struct b43_wldev *dev)
         }
         if (phy->radio_ver == 0x2050 && phy->radio_rev <= 0x5)
                 b43_radio_write16(dev, 0x0051, 0x0037);
+
+        write_unlock(&wl->tx_lock);
+        spin_unlock_irq(&wl->irq_lock);
 }
 
 static void key_write(struct b43_wldev *dev,
@@ -1138,7 +1145,6 @@ static void b43_generate_noise_sample(struct b43_wldev *dev)
         b43_jssi_write(dev, 0x7F7F7F7F);
         b43_write32(dev, B43_MMIO_MACCMD,
                     b43_read32(dev, B43_MMIO_MACCMD) | B43_MACCMD_BGNOISE);
-        B43_WARN_ON(dev->noisecalc.channel_at_start != dev->phy.channel);
 }
 
 static void b43_calculate_link_quality(struct b43_wldev *dev)
@@ -1147,7 +1153,6 @@ static void b43_calculate_link_quality(struct b43_wldev *dev)
 
         if (dev->noisecalc.calculation_running)
                 return;
-        dev->noisecalc.channel_at_start = dev->phy.channel;
         dev->noisecalc.calculation_running = 1;
         dev->noisecalc.nr_samples = 0;
 
@@ -1164,9 +1169,16 @@ static void handle_irq_noise(struct b43_wldev *dev)
 
         /* Bottom half of Link Quality calculation. */
 
+        /* Possible race condition: It might be possible that the user
+         * changed to a different channel in the meantime since we
+         * started the calculation. We ignore that fact, since it's
+         * not really that much of a problem. The background noise is
+         * an estimation only anyway. Slightly wrong results will get damped
+         * by the averaging of the 8 sample rounds. Additionally the
+         * value is shortlived. So it will be replaced by the next noise
+         * calculation round soon. */
+
         B43_WARN_ON(!dev->noisecalc.calculation_running);
-        if (dev->noisecalc.channel_at_start != phy->channel)
-                goto drop_calculation;
         *((__le32 *)noise) = cpu_to_le32(b43_jssi_read(dev));
         if (noise[0] == 0x7F || noise[1] == 0x7F ||
             noise[2] == 0x7F || noise[3] == 0x7F)
@@ -1207,11 +1219,10 @@ static void handle_irq_noise(struct b43_wldev *dev)
                         average -= 48;
 
                 dev->stats.link_noise = average;
-              drop_calculation:
                 dev->noisecalc.calculation_running = 0;
                 return;
         }
-      generate_new:
+generate_new:
         b43_generate_noise_sample(dev);
 }
 
@@ -1537,6 +1548,30 @@ static void b43_write_probe_resp_template(struct b43_wldev *dev,
         kfree(probe_resp_data);
 }
 
+static void b43_upload_beacon0(struct b43_wldev *dev)
+{
+        struct b43_wl *wl = dev->wl;
+
+        if (wl->beacon0_uploaded)
+                return;
+        b43_write_beacon_template(dev, 0x68, 0x18);
+        /* FIXME: Probe resp upload doesn't really belong here,
+         *        but we don't use that feature anyway. */
+        b43_write_probe_resp_template(dev, 0x268, 0x4A,
+                                      &__b43_ratetable[3]);
+        wl->beacon0_uploaded = 1;
+}
+
+static void b43_upload_beacon1(struct b43_wldev *dev)
+{
+        struct b43_wl *wl = dev->wl;
+
+        if (wl->beacon1_uploaded)
+                return;
+        b43_write_beacon_template(dev, 0x468, 0x1A);
+        wl->beacon1_uploaded = 1;
+}
+
 static void handle_irq_beacon(struct b43_wldev *dev)
 {
         struct b43_wl *wl = dev->wl;
@@ -1561,24 +1596,27 @@ static void handle_irq_beacon(struct b43_wldev *dev)
                 return;
         }
 
-        if (!beacon0_valid) {
-                if (!wl->beacon0_uploaded) {
-                        b43_write_beacon_template(dev, 0x68, 0x18);
-                        b43_write_probe_resp_template(dev, 0x268, 0x4A,
-                                                      &__b43_ratetable[3]);
-                        wl->beacon0_uploaded = 1;
-                }
+        if (unlikely(wl->beacon_templates_virgin)) {
+                /* We never uploaded a beacon before.
+                 * Upload both templates now, but only mark one valid. */
+                wl->beacon_templates_virgin = 0;
+                b43_upload_beacon0(dev);
+                b43_upload_beacon1(dev);
                 cmd = b43_read32(dev, B43_MMIO_MACCMD);
                 cmd |= B43_MACCMD_BEACON0_VALID;
                 b43_write32(dev, B43_MMIO_MACCMD, cmd);
-        } else if (!beacon1_valid) {
-                if (!wl->beacon1_uploaded) {
-                        b43_write_beacon_template(dev, 0x468, 0x1A);
-                        wl->beacon1_uploaded = 1;
+        } else {
+                if (!beacon0_valid) {
+                        b43_upload_beacon0(dev);
+                        cmd = b43_read32(dev, B43_MMIO_MACCMD);
+                        cmd |= B43_MACCMD_BEACON0_VALID;
+                        b43_write32(dev, B43_MMIO_MACCMD, cmd);
+                } else if (!beacon1_valid) {
+                        b43_upload_beacon1(dev);
+                        cmd = b43_read32(dev, B43_MMIO_MACCMD);
+                        cmd |= B43_MACCMD_BEACON1_VALID;
+                        b43_write32(dev, B43_MMIO_MACCMD, cmd);
                 }
-                cmd = b43_read32(dev, B43_MMIO_MACCMD);
-                cmd |= B43_MACCMD_BEACON1_VALID;
-                b43_write32(dev, B43_MMIO_MACCMD, cmd);
         }
 }
 
@@ -2840,26 +2878,37 @@ static int b43_op_tx(struct ieee80211_hw *hw,
 {
         struct b43_wl *wl = hw_to_b43_wl(hw);
         struct b43_wldev *dev = wl->current_dev;
-        int err = -ENODEV;
+        unsigned long flags;
+        int err;
 
         if (unlikely(skb->len < 2 + 2 + 6)) {
                 /* Too short, this can't be a valid frame. */
-                return -EINVAL;
+                goto drop_packet;
         }
         B43_WARN_ON(skb_shinfo(skb)->nr_frags);
-
         if (unlikely(!dev))
-                goto out;
-        if (unlikely(b43_status(dev) < B43_STAT_STARTED))
-                goto out;
-        /* TX is done without a global lock. */
-        if (b43_using_pio_transfers(dev))
-                err = b43_pio_tx(dev, skb, ctl);
-        else
-                err = b43_dma_tx(dev, skb, ctl);
-out:
+                goto drop_packet;
+
+        /* Transmissions on seperate queues can run concurrently. */
+        read_lock_irqsave(&wl->tx_lock, flags);
+
+        err = -ENODEV;
+        if (likely(b43_status(dev) >= B43_STAT_STARTED)) {
+                if (b43_using_pio_transfers(dev))
+                        err = b43_pio_tx(dev, skb, ctl);
+                else
+                        err = b43_dma_tx(dev, skb, ctl);
+        }
+
+        read_unlock_irqrestore(&wl->tx_lock, flags);
+
         if (unlikely(err))
-                return NETDEV_TX_BUSY;
+                goto drop_packet;
+        return NETDEV_TX_OK;
+
+drop_packet:
+        /* We can not transmit this packet. Drop it. */
+        dev_kfree_skb_any(skb);
         return NETDEV_TX_OK;
 }
 
@@ -3476,7 +3525,9 @@ static void b43_wireless_core_stop(struct b43_wldev *dev)
         spin_unlock_irqrestore(&wl->irq_lock, flags);
         b43_synchronize_irq(dev);
 
+        write_lock_irqsave(&wl->tx_lock, flags);
         b43_set_status(dev, B43_STAT_INITIALIZED);
+        write_unlock_irqrestore(&wl->tx_lock, flags);
 
         b43_pio_stop(dev);
         mutex_unlock(&wl->mutex);
@@ -3485,8 +3536,6 @@ static void b43_wireless_core_stop(struct b43_wldev *dev)
         cancel_delayed_work_sync(&dev->periodic_work);
         mutex_lock(&wl->mutex);
 
-        ieee80211_stop_queues(wl->hw);  //FIXME this could cause a deadlock, as mac80211 seems buggy.
-
         b43_mac_suspend(dev);
         free_irq(dev->dev->irq, dev);
         b43dbg(wl, "Wireless interface stopped\n");
@@ -4059,6 +4108,9 @@ static int b43_op_start(struct ieee80211_hw *hw)
         wl->filter_flags = 0;
         wl->radiotap_enabled = 0;
         b43_qos_clear(wl);
+        wl->beacon0_uploaded = 0;
+        wl->beacon1_uploaded = 0;
+        wl->beacon_templates_virgin = 1;
 
         /* First register RFkill.
          * LEDs that are registered later depend on it. */
@@ -4227,7 +4279,9 @@ static void b43_chip_reset(struct work_struct *work)
                         goto out;
                 }
         }
-      out:
+out:
+        if (err)
+                wl->current_dev = NULL; /* Failed to init the dev. */
         mutex_unlock(&wl->mutex);
         if (err)
                 b43err(wl, "Controller restart FAILED\n");
@@ -4326,6 +4380,14 @@ static int b43_wireless_core_attach(struct b43_wldev *dev)
                 err = -EOPNOTSUPP;
                 goto err_powerdown;
         }
+        if (1 /* disable A-PHY */) {
+                /* FIXME: For now we disable the A-PHY on multi-PHY devices. */
+                if (dev->phy.type != B43_PHYTYPE_N) {
+                        have_2ghz_phy = 1;
+                        have_5ghz_phy = 0;
+                }
+        }
+
         dev->phy.gmode = have_2ghz_phy;
         tmp = dev->phy.gmode ? B43_TMSLOW_GMODE : 0;
         b43_wireless_core_reset(dev, tmp);
@@ -4360,9 +4422,11 @@ static void b43_one_core_detach(struct ssb_device *dev)
         struct b43_wldev *wldev;
         struct b43_wl *wl;
 
+        /* Do not cancel ieee80211-workqueue based work here.
+         * See comment in b43_remove(). */
+
         wldev = ssb_get_drvdata(dev);
         wl = wldev->wl;
-        cancel_work_sync(&wldev->restart_work);
         b43_debugfs_remove_device(wldev);
         b43_wireless_core_detach(wldev);
         list_del(&wldev->list);
@@ -4490,6 +4554,7 @@ static int b43_wireless_init(struct ssb_device *dev)
         memset(wl, 0, sizeof(*wl));
         wl->hw = hw;
         spin_lock_init(&wl->irq_lock);
+        rwlock_init(&wl->tx_lock);
         spin_lock_init(&wl->leds_lock);
         spin_lock_init(&wl->shm_lock);
         mutex_init(&wl->mutex);
@@ -4546,6 +4611,10 @@ static void b43_remove(struct ssb_device *dev)
         struct b43_wl *wl = ssb_get_devtypedata(dev);
         struct b43_wldev *wldev = ssb_get_drvdata(dev);
 
+        /* We must cancel any work here before unregistering from ieee80211,
+         * as the ieee80211 unreg will destroy the workqueue. */
+        cancel_work_sync(&wldev->restart_work);
+
         B43_WARN_ON(!wl);
         if (wl->current_dev == wldev)
                 ieee80211_unregister_hw(wl->hw);