iwmc3200wifi: add iwm_if_add and iwm_if_remove

We used to do alloc_netdev and register_netdev at the same time in
iwm_if_alloc. But some bus related structures will only be initialized
after iwm_priv is allocated. This caused a race condition that the
netdev might be registered earlier. The patch adds iwm_if_add and
iwm_if_remove so that the bus layer could register the device after
all initialization is done.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Samuel Ortiz <samuel.ortiz@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 31 insertions, 12 deletions

diff --git a/drivers/net/wireless/iwmc3200wifi/iwm.h b/drivers/net/wireless/iwmc3200wifi/iwm.h
index 2237448e0427..4aa0ad1932ff 100644
--- a/drivers/net/wireless/iwmc3200wifi/iwm.h
+++ b/drivers/net/wireless/iwmc3200wifi/iwm.h
@@ -315,6 +315,8 @@ extern const struct iw_handler_def iwm_iw_handler_def;
 void *iwm_if_alloc(int sizeof_bus, struct device *dev,
                    struct iwm_if_ops *if_ops);
 void iwm_if_free(struct iwm_priv *iwm);
+int iwm_if_add(struct iwm_priv *iwm);
+void iwm_if_remove(struct iwm_priv *iwm);
 int iwm_mode_to_nl80211_iftype(int mode);
 int iwm_priv_init(struct iwm_priv *iwm);
 void iwm_priv_deinit(struct iwm_priv *iwm);
diff --git a/drivers/net/wireless/iwmc3200wifi/netdev.c b/drivers/net/wireless/iwmc3200wifi/netdev.c
index 88dd82649b47..aaa20c6885c8 100644
--- a/drivers/net/wireless/iwmc3200wifi/netdev.c
+++ b/drivers/net/wireless/iwmc3200wifi/netdev.c
@@ -123,8 +123,7 @@ void *iwm_if_alloc(int sizeof_bus, struct device *dev,
 
         wdev->iftype = iwm_mode_to_nl80211_iftype(iwm->conf.mode);
 
-        ndev = alloc_netdev_mq(0, "wlan%d", ether_setup,
-                               IWM_TX_QUEUES);
+        ndev = alloc_netdev_mq(0, "wlan%d", ether_setup, IWM_TX_QUEUES);
         if (!ndev) {
                 dev_err(dev, "no memory for network device instance\n");
                 goto out_priv;
@@ -134,19 +133,10 @@ void *iwm_if_alloc(int sizeof_bus, struct device *dev,
         ndev->wireless_handlers = &iwm_iw_handler_def;
         ndev->ieee80211_ptr = wdev;
         SET_NETDEV_DEV(ndev, wiphy_dev(wdev->wiphy));
-        ret = register_netdev(ndev);
-        if (ret < 0) {
-                dev_err(dev, "Failed to register netdev: %d\n", ret);
-                goto out_ndev;
-        }
-
         wdev->netdev = ndev;
 
         return iwm;
 
- out_ndev:
-        free_netdev(ndev);
-
  out_priv:
         iwm_priv_deinit(iwm);
 
@@ -160,8 +150,26 @@ void iwm_if_free(struct iwm_priv *iwm)
         if (!iwm_to_ndev(iwm))
                 return;
 
-        unregister_netdev(iwm_to_ndev(iwm));
         free_netdev(iwm_to_ndev(iwm));
         iwm_wdev_free(iwm);
         iwm_priv_deinit(iwm);
 }
+
+int iwm_if_add(struct iwm_priv *iwm)
+{
+        struct net_device *ndev = iwm_to_ndev(iwm);
+        int ret;
+
+        ret = register_netdev(ndev);
+        if (ret < 0) {
+                dev_err(&ndev->dev, "Failed to register netdev: %d\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+void iwm_if_remove(struct iwm_priv *iwm)
+{
+        unregister_netdev(iwm_to_ndev(iwm));
+}
diff --git a/drivers/net/wireless/iwmc3200wifi/sdio.c b/drivers/net/wireless/iwmc3200wifi/sdio.c
index b54da677b371..c0405715647a 100644
--- a/drivers/net/wireless/iwmc3200wifi/sdio.c
+++ b/drivers/net/wireless/iwmc3200wifi/sdio.c
@@ -454,10 +454,18 @@ static int iwm_sdio_probe(struct sdio_func *func,
 
         INIT_WORK(&hw->isr_worker, iwm_sdio_isr_worker);
 
+        ret = iwm_if_add(iwm);
+        if (ret) {
+                dev_err(dev, "add SDIO interface failed\n");
+                goto destroy_wq;
+        }
+
         dev_info(dev, "IWM SDIO probe\n");
 
         return 0;
 
+ destroy_wq:
+        destroy_workqueue(hw->isr_wq);
  debugfs_exit:
         iwm_debugfs_exit(iwm);
  if_free:
@@ -472,6 +480,7 @@ static void iwm_sdio_remove(struct sdio_func *func)
         struct device *dev = &func->dev;
 
         iwm_debugfs_exit(iwm);
+        iwm_if_remove(iwm);
         iwm_if_free(iwm);
         destroy_workqueue(hw->isr_wq);