1 files changed, 64 insertions, 22 deletions

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 8fdba9415c04..fa4b0d8b74a2 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -1145,7 +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)
@@ -1154,7 +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;
 
@@ -1171,9 +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)
@@ -1214,11 +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);
 }
 
@@ -1544,6 +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;
@@ -1568,24 +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);
         }
 }
 
@@ -4073,6 +4104,9 @@ 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. */
@@ -4241,7 +4275,9 @@ 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");
@@ -4382,9 +4418,11 @@ 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);
@@ -4569,6 +4607,10 @@ 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);