wimax/i2400m: cleanup initialization/destruction flow

Currently the i2400m driver was starting in a weird way: registering a
network device, setting the device up and then registering a WiMAX
device.

This is an historic artifact, and was causing issues, a some early
reports the device sends were getting lost by issue of the wimax_dev
not being registered.

Fix said situation by doing the wimax device registration in
i2400m_setup() after network device registration and before starting
thed device.

As well, removed spurious setting of the state to UNINITIALIZED;
i2400m.dev_start() does that already.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>

3 files changed, 41 insertions, 31 deletions

diff --git a/drivers/net/wimax/i2400m/driver.c b/drivers/net/wimax/i2400m/driver.c
index a33df0431020..a0ae19966c0c 100644
--- a/drivers/net/wimax/i2400m/driver.c
+++ b/drivers/net/wimax/i2400m/driver.c
@@ -754,13 +754,9 @@ EXPORT_SYMBOL_GPL(i2400m_bm_buf_free
  *
  * Returns: 0 if ok, < 0 errno code on error.
  *
- * Initializes the bus-generic parts of the i2400m driver; the
- * bus-specific parts have been initialized, function pointers filled
- * out by the bus-specific probe function.
- *
- * As well, this registers the WiMAX and net device nodes. Once this
- * function returns, the device is operative and has to be ready to
- * receive and send network traffic and WiMAX control operations.
+ * Sets up basic device comunication infrastructure, boots the ROM to
+ * read the MAC address, registers with the WiMAX and network stacks
+ * and then brings up the device.
  */
 int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags)
 {
@@ -796,18 +792,13 @@ int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags)
         }
         netif_carrier_off(net_dev);
 
-        result = i2400m_dev_start(i2400m, bm_flags);
-        if (result < 0)
-                goto error_dev_start;
-
         i2400m->wimax_dev.op_msg_from_user = i2400m_op_msg_from_user;
         i2400m->wimax_dev.op_rfkill_sw_toggle = i2400m_op_rfkill_sw_toggle;
         i2400m->wimax_dev.op_reset = i2400m_op_reset;
+
         result = wimax_dev_add(&i2400m->wimax_dev, net_dev);
         if (result < 0)
                 goto error_wimax_dev_add;
-        /* User space needs to do some init stuff */
-        wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED);
 
         /* Now setup all that requires a registered net and wimax device. */
         result = sysfs_create_group(&net_dev->dev.kobj, &i2400m_dev_attr_group);
@@ -815,22 +806,27 @@ int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags)
                 dev_err(dev, "cannot setup i2400m's sysfs: %d\n", result);
                 goto error_sysfs_setup;
         }
+
         result = i2400m_debugfs_add(i2400m);
         if (result < 0) {
                 dev_err(dev, "cannot setup i2400m's debugfs: %d\n", result);
                 goto error_debugfs_setup;
         }
+
+        result = i2400m_dev_start(i2400m, bm_flags);
+        if (result < 0)
+                goto error_dev_start;
         d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
         return result;
 
+error_dev_start:
+        i2400m_debugfs_rm(i2400m);
 error_debugfs_setup:
         sysfs_remove_group(&i2400m->wimax_dev.net_dev->dev.kobj,
                            &i2400m_dev_attr_group);
 error_sysfs_setup:
         wimax_dev_rm(&i2400m->wimax_dev);
 error_wimax_dev_add:
-        i2400m_dev_stop(i2400m);
-error_dev_start:
         unregister_netdev(net_dev);
 error_register_netdev:
         unregister_pm_notifier(&i2400m->pm_notifier);
@@ -854,15 +850,15 @@ void i2400m_release(struct i2400m *i2400m)
         d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
         netif_stop_queue(i2400m->wimax_dev.net_dev);
 
+        i2400m_dev_stop(i2400m);
+
         i2400m_debugfs_rm(i2400m);
         sysfs_remove_group(&i2400m->wimax_dev.net_dev->dev.kobj,
                            &i2400m_dev_attr_group);
         wimax_dev_rm(&i2400m->wimax_dev);
-        i2400m_dev_stop(i2400m);
         unregister_netdev(i2400m->wimax_dev.net_dev);
         unregister_pm_notifier(&i2400m->pm_notifier);
-        kfree(i2400m->bm_ack_buf);
-        kfree(i2400m->bm_cmd_buf);
+        i2400m_bm_buf_free(i2400m);
         d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
 }
 EXPORT_SYMBOL_GPL(i2400m_release);
diff --git a/drivers/net/wimax/i2400m/i2400m.h b/drivers/net/wimax/i2400m/i2400m.h
index 303eb78bce32..2b9c400810b5 100644
--- a/drivers/net/wimax/i2400m/i2400m.h
+++ b/drivers/net/wimax/i2400m/i2400m.h
@@ -117,16 +117,28 @@
  * well as i2400m->wimax_dev.net_dev and call i2400m_setup(). The
  * i2400m driver will only register with the WiMAX and network stacks;
  * the only access done to the device is to read the MAC address so we
- * can register a network device. This calls i2400m_dev_start() to
- * load firmware, setup communication with the device and configure it
- * for operation.
+ * can register a network device.
  *
- * At this point, control and data communications are possible.
+ * The high-level call flow is:
+ *
+ * bus_probe()
+ *   i2400m_setup()
+ *     boot rom initialization / read mac addr
+ *     network / WiMAX stacks registration
+ *     i2400m_dev_start()
+ *       i2400m->bus_dev_start()
+ *       i2400m_dev_initialize()
+ *
+ * The reverse applies for a disconnect() call:
  *
- * On disconnect/driver unload, the bus-specific disconnect function
- * calls i2400m_release() to undo i2400m_setup(). i2400m_dev_stop()
- * shuts the firmware down and releases resources uses to communicate
- * with the device.
+ * bus_disconnect()
+ *   i2400m_release()
+ *     i2400m_dev_stop()
+ *       i2400m_dev_shutdown()
+ *       i2400m->bus_dev_stop()
+ *     network / WiMAX stack unregistration
+ *
+ * At this point, control and data communications are possible.
  *
  * While the device is up, it might reset. The bus-specific driver has
  * to catch that situation and call i2400m_dev_reset_handle() to deal
@@ -706,7 +718,7 @@ static inline int i2400m_debugfs_add(struct i2400m *i2400m)
 static inline void i2400m_debugfs_rm(struct i2400m *i2400m) {}
 #endif
 
-/* Called by _dev_start()/_dev_stop() to initialize the device itself */
+/* Initialize/shutdown the device */
 extern int i2400m_dev_initialize(struct i2400m *);
 extern void i2400m_dev_shutdown(struct i2400m *);
 
diff --git a/drivers/net/wimax/i2400m/netdev.c b/drivers/net/wimax/i2400m/netdev.c
index 0e8f6a046b9b..fefd794087ad 100644
--- a/drivers/net/wimax/i2400m/netdev.c
+++ b/drivers/net/wimax/i2400m/netdev.c
@@ -102,11 +102,13 @@ int i2400m_open(struct net_device *net_dev)
         struct device *dev = i2400m_dev(i2400m);
 
         d_fnstart(3, dev, "(net_dev %p [i2400m %p])\n", net_dev, i2400m);
-        if (i2400m->ready == 0) {
-                dev_err(dev, "Device is still initializing\n");
-                result = -EBUSY;
-        } else
+        /* Make sure we wait until init is complete... */
+        mutex_lock(&i2400m->init_mutex);
+        if (i2400m->updown)
                 result = 0;
+        else
+                result = -EBUSY;
+        mutex_unlock(&i2400m->init_mutex);
         d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n",
                 net_dev, i2400m, result);
         return result;