Merge tag 'mac80211-for-davem-2018-06-15' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg says:

====================
A handful of fixes:
 * missing RCU grace period enforcement led to drivers freeing
   data structures before; fix from Dedy Lansky.
 * hwsim module init error paths were messed up; fixed it myself
   after a report from Colin King (who had sent a partial patch)
 * kernel-doc tag errors; fix from Luca Coelho
 * initialize the on-stack sinfo data structure when getting
   station information; fix from Sven Eckelmann
 * TXQ state dumping is now done from init, and when TXQs aren't
   initialized yet at that point, bad things happen, move the
   initialization; fix from Toke Høiland-Jørgensen.
====================

Signed-off-by: David S. Miller <[email protected]>

Author: davem330

drivers/net/wireless/mac80211_hwsim.c

@@ -3572,11 +3572,14 @@ static int __init init_mac80211_hwsim(void)
 	hwsim_wq = alloc_workqueue("hwsim_wq", 0, 0);
 	if (!hwsim_wq)
 		return -ENOMEM;
-	rhashtable_init(&hwsim_radios_rht, &hwsim_rht_params);
+
+	err = rhashtable_init(&hwsim_radios_rht, &hwsim_rht_params);
+	if (err)
+		goto out_free_wq;
 
 	err = register_pernet_device(&hwsim_net_ops);
 	if (err)
-		return err;
+		goto out_free_rht;
 
 	err = platform_driver_register(&mac80211_hwsim_driver);
 	if (err)
@@ -3701,6 +3704,10 @@ static int __init init_mac80211_hwsim(void)
 	platform_driver_unregister(&mac80211_hwsim_driver);
 out_unregister_pernet:
 	unregister_pernet_device(&hwsim_net_ops);
+out_free_rht:
+	rhashtable_destroy(&hwsim_radios_rht);
+out_free_wq:
+	destroy_workqueue(hwsim_wq);
 	return err;
 }
 module_init(init_mac80211_hwsim);

include/uapi/linux/nl80211.h

@@ -981,18 +981,18 @@
  *	only the %NL80211_ATTR_IE data is used and updated with this command.
  *
  * @NL80211_CMD_SET_PMK: For offloaded 4-Way handshake, set the PMK or PMK-R0
- *	for the given authenticator address (specified with &NL80211_ATTR_MAC).
- *	When &NL80211_ATTR_PMKR0_NAME is set, &NL80211_ATTR_PMK specifies the
+ *	for the given authenticator address (specified with %NL80211_ATTR_MAC).
+ *	When %NL80211_ATTR_PMKR0_NAME is set, %NL80211_ATTR_PMK specifies the
  *	PMK-R0, otherwise it specifies the PMK.
  * @NL80211_CMD_DEL_PMK: For offloaded 4-Way handshake, delete the previously
  *	configured PMK for the authenticator address identified by
- *	&NL80211_ATTR_MAC.
+ *	%NL80211_ATTR_MAC.
  * @NL80211_CMD_PORT_AUTHORIZED: An event that indicates that the 4 way
  *	handshake was completed successfully by the driver. The BSSID is
- *	specified with &NL80211_ATTR_MAC. Drivers that support 4 way handshake
+ *	specified with %NL80211_ATTR_MAC. Drivers that support 4 way handshake
  *	offload should send this event after indicating 802.11 association with
- *	&NL80211_CMD_CONNECT or &NL80211_CMD_ROAM. If the 4 way handshake failed
- *	&NL80211_CMD_DISCONNECT should be indicated instead.
+ *	%NL80211_CMD_CONNECT or %NL80211_CMD_ROAM. If the 4 way handshake failed
+ *	%NL80211_CMD_DISCONNECT should be indicated instead.
  *
  * @NL80211_CMD_CONTROL_PORT_FRAME: Control Port (e.g. PAE) frame TX request
  *	and RX notification.  This command is used both as a request to transmit
@@ -1029,9 +1029,9 @@
  *	initiated the connection through the connect request.
  *
  * @NL80211_CMD_STA_OPMODE_CHANGED: An event that notify station's
- *	ht opmode or vht opmode changes using any of &NL80211_ATTR_SMPS_MODE,
- *	&NL80211_ATTR_CHANNEL_WIDTH,&NL80211_ATTR_NSS attributes with its
- *	address(specified in &NL80211_ATTR_MAC).
+ *	ht opmode or vht opmode changes using any of %NL80211_ATTR_SMPS_MODE,
+ *	%NL80211_ATTR_CHANNEL_WIDTH,%NL80211_ATTR_NSS attributes with its
+ *	address(specified in %NL80211_ATTR_MAC).
  *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
@@ -2218,7 +2218,7 @@ enum nl80211_commands {
  * @NL80211_ATTR_EXTERNAL_AUTH_ACTION: Identify the requested external
  *     authentication operation (u32 attribute with an
  *     &enum nl80211_external_auth_action value). This is used with the
- *     &NL80211_CMD_EXTERNAL_AUTH request event.
+ *     %NL80211_CMD_EXTERNAL_AUTH request event.
  * @NL80211_ATTR_EXTERNAL_AUTH_SUPPORT: Flag attribute indicating that the user
  *     space supports external authentication. This attribute shall be used
  *     only with %NL80211_CMD_CONNECT request. The driver may offload
@@ -3491,7 +3491,7 @@ enum nl80211_sched_scan_match_attr {
  * @NL80211_RRF_AUTO_BW: maximum available bandwidth should be calculated
  *	base on contiguous rules and wider channels will be allowed to cross
  *	multiple contiguous/overlapping frequency ranges.
- * @NL80211_RRF_IR_CONCURRENT: See &NL80211_FREQUENCY_ATTR_IR_CONCURRENT
+ * @NL80211_RRF_IR_CONCURRENT: See %NL80211_FREQUENCY_ATTR_IR_CONCURRENT
  * @NL80211_RRF_NO_HT40MINUS: channels can't be used in HT40- operation
  * @NL80211_RRF_NO_HT40PLUS: channels can't be used in HT40+ operation
  * @NL80211_RRF_NO_80MHZ: 80MHz operation not allowed
@@ -5643,11 +5643,11 @@ enum nl80211_nan_func_attributes {
  * @NL80211_NAN_SRF_INCLUDE: present if the include bit of the SRF set.
  *	This is a flag.
  * @NL80211_NAN_SRF_BF: Bloom Filter. Present if and only if
- *	&NL80211_NAN_SRF_MAC_ADDRS isn't present. This attribute is binary.
+ *	%NL80211_NAN_SRF_MAC_ADDRS isn't present. This attribute is binary.
  * @NL80211_NAN_SRF_BF_IDX: index of the Bloom Filter. Mandatory if
- *	&NL80211_NAN_SRF_BF is present. This is a u8.
+ *	%NL80211_NAN_SRF_BF is present. This is a u8.
  * @NL80211_NAN_SRF_MAC_ADDRS: list of MAC addresses for the SRF. Present if
- *	and only if &NL80211_NAN_SRF_BF isn't present. This is a nested
+ *	and only if %NL80211_NAN_SRF_BF isn't present. This is a nested
  *	attribute. Each nested attribute is a MAC address.
  * @NUM_NL80211_NAN_SRF_ATTR: internal
  * @NL80211_NAN_SRF_ATTR_MAX: highest NAN SRF attribute

net/mac80211/main.c

@@ -1098,6 +1098,10 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 
 	ieee80211_led_init(local);
 
+	result = ieee80211_txq_setup_flows(local);
+	if (result)
+		goto fail_flows;
+
 	rtnl_lock();
 
 	result = ieee80211_init_rate_ctrl_alg(local,
@@ -1120,10 +1124,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 
 	rtnl_unlock();
 
-	result = ieee80211_txq_setup_flows(local);
-	if (result)
-		goto fail_flows;
-
 #ifdef CONFIG_INET
 	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 	result = register_inetaddr_notifier(&local->ifa_notifier);
@@ -1149,15 +1149,15 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
  fail_ifa:
 #endif
-	ieee80211_txq_teardown_flows(local);
- fail_flows:
 	rtnl_lock();
 	rate_control_deinitialize(local);
 	ieee80211_remove_interfaces(local);
  fail_rate:
 	rtnl_unlock();
 	ieee80211_led_exit(local);
 	ieee80211_wep_free(local);
+	ieee80211_txq_teardown_flows(local);
+ fail_flows:
 	destroy_workqueue(local->workqueue);
  fail_workqueue:
 	wiphy_unregister(local->hw.wiphy);

net/wireless/core.c

@@ -1012,6 +1012,7 @@ void cfg80211_unregister_wdev(struct wireless_dev *wdev)
 	nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 
 	list_del_rcu(&wdev->list);
+	synchronize_rcu();
 	rdev->devlist_generation++;
 
 	switch (wdev->iftype) {

net/wireless/util.c

@@ -1746,6 +1746,8 @@ int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
 	if (!rdev->ops->get_station)
 		return -EOPNOTSUPP;
 
+	memset(sinfo, 0, sizeof(*sinfo));
+
 	return rdev_get_station(rdev, dev, mac_addr, sinfo);
 }
 EXPORT_SYMBOL(cfg80211_get_station);