4 files changed, 103 insertions, 25 deletions

diff --git a/drivers/net/wireless/iwmc3200wifi/iwm.h b/drivers/net/wireless/iwmc3200wifi/iwm.h
index 635c16ee618..77c339f8516 100644
--- a/drivers/net/wireless/iwmc3200wifi/iwm.h
+++ b/drivers/net/wireless/iwmc3200wifi/iwm.h
@@ -288,6 +288,7 @@ struct iwm_priv {
 	u8 *eeprom;
 	struct timer_list watchdog;
 	struct work_struct reset_worker;
+	struct mutex mutex;
 	struct rfkill *rfkill;
 
 	char private[0] __attribute__((__aligned__(NETDEV_ALIGN)));
@@ -315,8 +316,11 @@ 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);
 void iwm_reset(struct iwm_priv *iwm);
 void iwm_tx_credit_init_pools(struct iwm_priv *iwm,
 			      struct iwm_umac_notif_alive *alive);
diff --git a/drivers/net/wireless/iwmc3200wifi/main.c b/drivers/net/wireless/iwmc3200wifi/main.c
index 6a2640f16b6..8be206d5822 100644
--- a/drivers/net/wireless/iwmc3200wifi/main.c
+++ b/drivers/net/wireless/iwmc3200wifi/main.c
@@ -112,6 +112,9 @@ static void iwm_statistics_request(struct work_struct *work)
 	iwm_send_umac_stats_req(iwm, 0);
 }
 
+int __iwm_up(struct iwm_priv *iwm);
+int __iwm_down(struct iwm_priv *iwm);
+
 static void iwm_reset_worker(struct work_struct *work)
 {
 	struct iwm_priv *iwm;
@@ -120,6 +123,19 @@ static void iwm_reset_worker(struct work_struct *work)
 
 	iwm = container_of(work, struct iwm_priv, reset_worker);
 
+	/*
+	 * XXX: The iwm->mutex is introduced purely for this reset work,
+	 * because the other users for iwm_up and iwm_down are only netdev
+	 * ndo_open and ndo_stop which are already protected by rtnl.
+	 * Please remove iwm->mutex together if iwm_reset_worker() is not
+	 * required in the future.
+	 */
+	if (!mutex_trylock(&iwm->mutex)) {
+		IWM_WARN(iwm, "We are in the middle of interface bringing "
+			 "UP/DOWN. Skip driver resetting.\n");
+		return;
+	}
+
 	if (iwm->umac_profile_active) {
 		profile = kmalloc(sizeof(struct iwm_umac_profile), GFP_KERNEL);
 		if (profile)
@@ -128,10 +144,10 @@ static void iwm_reset_worker(struct work_struct *work)
 			IWM_ERR(iwm, "Couldn't alloc memory for profile\n");
 	}
 
-	iwm_down(iwm);
+	__iwm_down(iwm);
 
 	while (retry++ < 3) {
-		ret = iwm_up(iwm);
+		ret = __iwm_up(iwm);
 		if (!ret)
 			break;
 
@@ -142,7 +158,7 @@ static void iwm_reset_worker(struct work_struct *work)
 		IWM_WARN(iwm, "iwm_up() failed: %d\n", ret);
 
 		kfree(profile);
-		return;
+		goto out;
 	}
 
 	if (profile) {
@@ -151,6 +167,9 @@ static void iwm_reset_worker(struct work_struct *work)
 		iwm_send_mlme_profile(iwm);
 		kfree(profile);
 	}
+
+ out:
+	mutex_unlock(&iwm->mutex);
 }
 
 static void iwm_watchdog(unsigned long data)
@@ -215,10 +234,21 @@ int iwm_priv_init(struct iwm_priv *iwm)
 	init_timer(&iwm->watchdog);
 	iwm->watchdog.function = iwm_watchdog;
 	iwm->watchdog.data = (unsigned long)iwm;
+	mutex_init(&iwm->mutex);
 
 	return 0;
 }
 
+void iwm_priv_deinit(struct iwm_priv *iwm)
+{
+	int i;
+
+	for (i = 0; i < IWM_TX_QUEUES; i++)
+		destroy_workqueue(iwm->txq[i].wq);
+
+	destroy_workqueue(iwm->rx_wq);
+}
+
 /*
  * We reset all the structures, and we reset the UMAC.
  * After calling this routine, you're expected to reload
@@ -466,7 +496,7 @@ void iwm_link_off(struct iwm_priv *iwm)
 
 	iwm_rx_free(iwm);
 
-	cancel_delayed_work(&iwm->stats_request);
+	cancel_delayed_work_sync(&iwm->stats_request);
 	memset(wstats, 0, sizeof(struct iw_statistics));
 	wstats->qual.updated = IW_QUAL_ALL_INVALID;
 
@@ -511,7 +541,7 @@ static int iwm_channels_init(struct iwm_priv *iwm)
 	return 0;
 }
 
-int iwm_up(struct iwm_priv *iwm)
+int __iwm_up(struct iwm_priv *iwm)
 {
 	int ret;
 	struct iwm_notif *notif_reboot, *notif_ack = NULL;
@@ -647,7 +677,18 @@ int iwm_up(struct iwm_priv *iwm)
 	return -EIO;
 }
 
-int iwm_down(struct iwm_priv *iwm)
+int iwm_up(struct iwm_priv *iwm)
+{
+	int ret;
+
+	mutex_lock(&iwm->mutex);
+	ret = __iwm_up(iwm);
+	mutex_unlock(&iwm->mutex);
+
+	return ret;
+}
+
+int __iwm_down(struct iwm_priv *iwm)
 {
 	int ret;
 
@@ -678,3 +719,14 @@ int iwm_down(struct iwm_priv *iwm)
 
 	return 0;
 }
+
+int iwm_down(struct iwm_priv *iwm)
+{
+	int ret;
+
+	mutex_lock(&iwm->mutex);
+	ret = __iwm_down(iwm);
+	mutex_unlock(&iwm->mutex);
+
+	return ret;
+}
diff --git a/drivers/net/wireless/iwmc3200wifi/netdev.c b/drivers/net/wireless/iwmc3200wifi/netdev.c
index 68e2c3b6c7a..aaa20c6885c 100644
--- a/drivers/net/wireless/iwmc3200wifi/netdev.c
+++ b/drivers/net/wireless/iwmc3200wifi/netdev.c
@@ -114,32 +114,31 @@ void *iwm_if_alloc(int sizeof_bus, struct device *dev,
 	iwm = wdev_to_iwm(wdev);
 	iwm->bus_ops = if_ops;
 	iwm->wdev = wdev;
-	iwm_priv_init(iwm);
+
+	ret = iwm_priv_init(iwm);
+	if (ret) {
+		dev_err(dev, "failed to init iwm_priv\n");
+		goto out_wdev;
+	}
+
 	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_wdev;
+		goto out_priv;
 	}
 
 	ndev->netdev_ops = &iwm_netdev_ops;
 	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);
 
  out_wdev:
 	iwm_wdev_free(iwm);
@@ -148,15 +147,29 @@ void *iwm_if_alloc(int sizeof_bus, struct device *dev,
 
 void iwm_if_free(struct iwm_priv *iwm)
 {
-	int i;
-
 	if (!iwm_to_ndev(iwm))
 		return;
 
-	unregister_netdev(iwm_to_ndev(iwm));
 	free_netdev(iwm_to_ndev(iwm));
 	iwm_wdev_free(iwm);
-	destroy_workqueue(iwm->rx_wq);
-	for (i = 0; i < IWM_TX_QUEUES; i++)
-		destroy_workqueue(iwm->txq[i].wq);
+	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 b54da677b37..916681837fd 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:
@@ -471,9 +479,10 @@ static void iwm_sdio_remove(struct sdio_func *func)
 	struct iwm_priv *iwm = hw_to_iwm(hw);
 	struct device *dev = &func->dev;
 
+	iwm_if_remove(iwm);
+	destroy_workqueue(hw->isr_wq);
 	iwm_debugfs_exit(iwm);
 	iwm_if_free(iwm);
-	destroy_workqueue(hw->isr_wq);
 
 	sdio_set_drvdata(func, NULL);