wimax/i2400m: if a device reboot happens during probe, handle it
[linux-2.6.git] / drivers / net / wimax / i2400m / driver.c
index d33389f..e8d022d 100644 (file)
@@ -82,6 +82,14 @@ module_param_named(rx_reorder_disabled, i2400m_rx_reorder_disabled, int, 0644);
 MODULE_PARM_DESC(rx_reorder_disabled,
                 "If true, RX reordering will be disabled.");
 
+int i2400m_power_save_disabled;        /* 0 (power saving enabled) by default */
+module_param_named(power_save_disabled, i2400m_power_save_disabled, int, 0644);
+MODULE_PARM_DESC(power_save_disabled,
+                "If true, the driver will not tell the device to enter "
+                "power saving mode when it reports it is ready for it. "
+                "False by default (so the device is told to do power "
+                "saving).");
+
 /**
  * i2400m_queue_work - schedule work on a i2400m's queue
  *
@@ -172,7 +180,6 @@ int i2400m_schedule_work(struct i2400m *i2400m,
        int result;
        struct i2400m_work *iw;
 
-       BUG_ON(i2400m->work_queue == NULL);
        result = -ENOMEM;
        iw = kzalloc(sizeof(*iw), gfp_flags);
        if (iw == NULL)
@@ -231,20 +238,10 @@ int i2400m_op_msg_from_user(struct wimax_dev *wimax_dev,
        d_fnstart(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p "
                  "msg_len %zu genl_info %p)\n", wimax_dev, i2400m,
                  msg_buf, msg_len, genl_info);
-       if (unlikely(i2400m->trace_msg_from_user))
-               wimax_msg(&i2400m->wimax_dev, "echo",
-                         msg_buf, msg_len, GFP_KERNEL);
        ack_skb = i2400m_msg_to_dev(i2400m, msg_buf, msg_len);
        result = PTR_ERR(ack_skb);
        if (IS_ERR(ack_skb))
                goto error_msg_to_dev;
-       if (unlikely(i2400m->trace_msg_from_user)) {
-               const void *ack_data;
-               size_t ack_len;
-               ack_data = wimax_msg_data_len(ack_skb, &ack_len);
-               wimax_msg(&i2400m->wimax_dev, "echo",
-                         ack_data, ack_len, GFP_KERNEL);
-       }
        result = wimax_msg_send(&i2400m->wimax_dev, ack_skb);
 error_msg_to_dev:
        d_fnend(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p msg_len %zu "
@@ -387,6 +384,11 @@ error:
  * Uploads firmware and brings up all the resources needed to be able
  * to communicate with the device.
  *
+ * The workqueue has to be setup early, at least before RX handling
+ * (it's only real user for now) so it can process reports as they
+ * arrive. We also want to destroy it if we retry, to make sure it is
+ * flushed...easier like this.
+ *
  * TX needs to be setup before the bus-specific code (otherwise on
  * shutdown, the bus-tx code could try to access it).
  */
@@ -412,15 +414,15 @@ retry:
        result = i2400m_rx_setup(i2400m);
        if (result < 0)
                goto error_rx_setup;
-       result = i2400m->bus_dev_start(i2400m);
-       if (result < 0)
-               goto error_bus_dev_start;
        i2400m->work_queue = create_singlethread_workqueue(wimax_dev->name);
        if (i2400m->work_queue == NULL) {
                result = -ENOMEM;
                dev_err(dev, "cannot create workqueue\n");
                goto error_create_workqueue;
        }
+       result = i2400m->bus_dev_start(i2400m);
+       if (result < 0)
+               goto error_bus_dev_start;
        result = i2400m_firmware_check(i2400m); /* fw versions ok? */
        if (result < 0)
                goto error_fw_check;
@@ -442,10 +444,10 @@ retry:
 error_dev_initialize:
 error_check_mac_addr:
 error_fw_check:
-       destroy_workqueue(i2400m->work_queue);
-error_create_workqueue:
        i2400m->bus_dev_stop(i2400m);
 error_bus_dev_start:
+       destroy_workqueue(i2400m->work_queue);
+error_create_workqueue:
        i2400m_rx_release(i2400m);
 error_rx_setup:
        i2400m_tx_release(i2400m);
@@ -481,7 +483,9 @@ int i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri bm_flags)
  *
  * Returns: 0 if ok, < 0 errno code on error.
  *
- * Releases all the resources allocated to communicate with the device.
+ * Releases all the resources allocated to communicate with the
+ * device. Note we cannot destroy the workqueue earlier as until RX is
+ * fully destroyed, it could still try to schedule jobs.
  */
 static
 void __i2400m_dev_stop(struct i2400m *i2400m)
@@ -493,8 +497,8 @@ void __i2400m_dev_stop(struct i2400m *i2400m)
        wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING);
        i2400m_dev_shutdown(i2400m);
        i2400m->ready = 0;
-       destroy_workqueue(i2400m->work_queue);
        i2400m->bus_dev_stop(i2400m);
+       destroy_workqueue(i2400m->work_queue);
        i2400m_rx_release(i2400m);
        i2400m_tx_release(i2400m);
        wimax_state_change(wimax_dev, WIMAX_ST_DOWN);
@@ -606,6 +610,8 @@ out:
  */
 int i2400m_dev_reset_handle(struct i2400m *i2400m)
 {
+       i2400m->boot_mode = 1;
+       wmb();          /* Make sure i2400m_msg_to_dev() sees boot_mode */
        return i2400m_schedule_work(i2400m, __i2400m_dev_reset_handle,
                                    GFP_ATOMIC);
 }