cfg80211: vastly simplify locking

Virtually all code paths in cfg80211 already (need to) hold
the RTNL. As such, there's little point in having another
four mutexes for various parts of the code, they just cause
lock ordering issues (and much of the time, the RTNL and a
few of the others need thus be held.)

Simplify all this by getting rid of the extra four mutexes
and just use the RTNL throughout. Only a few code changes
were needed to do this and we can get rid of a work struct
for bonus points.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 36 insertions, 142 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 5bcf3a5b6465..74cdb1a0cf31 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -59,7 +59,7 @@ __cfg80211_wdev_from_attrs(struct net *netns, struct nlattr **attrs)
 	int wiphy_idx = -1;
 	int ifidx = -1;
 
-	assert_cfg80211_lock();
+	ASSERT_RTNL();
 
 	if (!have_ifidx && !have_wdev_id)
 		return ERR_PTR(-EINVAL);
@@ -80,7 +80,6 @@ __cfg80211_wdev_from_attrs(struct net *netns, struct nlattr **attrs)
 		if (have_wdev_id && rdev->wiphy_idx != wiphy_idx)
 			continue;
 
-		mutex_lock(&rdev->devlist_mtx);
 		list_for_each_entry(wdev, &rdev->wdev_list, list) {
 			if (have_ifidx && wdev->netdev &&
 			    wdev->netdev->ifindex == ifidx) {
@@ -92,7 +91,6 @@ __cfg80211_wdev_from_attrs(struct net *netns, struct nlattr **attrs)
 				break;
 			}
 		}
-		mutex_unlock(&rdev->devlist_mtx);
 
 		if (result)
 			break;
@@ -109,7 +107,7 @@ __cfg80211_rdev_from_attrs(struct net *netns, struct nlattr **attrs)
 	struct cfg80211_registered_device *rdev = NULL, *tmp;
 	struct net_device *netdev;
 
-	assert_cfg80211_lock();
+	ASSERT_RTNL();
 
 	if (!attrs[NL80211_ATTR_WIPHY] &&
 	    !attrs[NL80211_ATTR_IFINDEX] &&
@@ -128,14 +126,12 @@ __cfg80211_rdev_from_attrs(struct net *netns, struct nlattr **attrs)
 		tmp = cfg80211_rdev_by_wiphy_idx(wdev_id >> 32);
 		if (tmp) {
 			/* make sure wdev exists */
-			mutex_lock(&tmp->devlist_mtx);
 			list_for_each_entry(wdev, &tmp->wdev_list, list) {
 				if (wdev->identifier != (u32)wdev_id)
 					continue;
 				found = true;
 				break;
 			}
-			mutex_unlock(&tmp->devlist_mtx);
 
 			if (!found)
 				tmp = NULL;
@@ -182,19 +178,6 @@ __cfg80211_rdev_from_attrs(struct net *netns, struct nlattr **attrs)
 /*
  * This function returns a pointer to the driver
  * that the genl_info item that is passed refers to.
- * If successful, it returns non-NULL and also locks
- * the driver's mutex!
- *
- * This means that you need to call cfg80211_unlock_rdev()
- * before being allowed to acquire &cfg80211_mutex!
- *
- * This is necessary because we need to lock the global
- * mutex to get an item off the list safely, and then
- * we lock the rdev mutex so it doesn't go away under us.
- *
- * We don't want to keep cfg80211_mutex locked
- * for all the time in order to allow requests on
- * other interfaces to go through at the same time.
  *
  * The result of this can be a PTR_ERR and hence must
  * be checked with IS_ERR() for errors.
@@ -202,20 +185,7 @@ __cfg80211_rdev_from_attrs(struct net *netns, struct nlattr **attrs)
 static struct cfg80211_registered_device *
 cfg80211_get_dev_from_info(struct net *netns, struct genl_info *info)
 {
-	struct cfg80211_registered_device *rdev;
-
-	mutex_lock(&cfg80211_mutex);
-	rdev = __cfg80211_rdev_from_attrs(netns, info->attrs);
-
-	/* if it is not an error we grab the lock on
-	 * it to assure it won't be going away while
-	 * we operate on it */
-	if (!IS_ERR(rdev))
-		mutex_lock(&rdev->mtx);
-
-	mutex_unlock(&cfg80211_mutex);
-
-	return rdev;
+	return __cfg80211_rdev_from_attrs(netns, info->attrs);
 }
 
 /* policy for the attributes */
@@ -456,7 +426,6 @@ static int nl80211_prepare_wdev_dump(struct sk_buff *skb,
 	int err;
 
 	rtnl_lock();
-	mutex_lock(&cfg80211_mutex);
 
 	if (!cb->args[0]) {
 		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
@@ -485,14 +454,12 @@ static int nl80211_prepare_wdev_dump(struct sk_buff *skb,
 		*rdev = wiphy_to_dev(wiphy);
 		*wdev = NULL;
 
-		mutex_lock(&(*rdev)->devlist_mtx);
 		list_for_each_entry(tmp, &(*rdev)->wdev_list, list) {
 			if (tmp->identifier == cb->args[1]) {
 				*wdev = tmp;
 				break;
 			}
 		}
-		mutex_unlock(&(*rdev)->devlist_mtx);
 
 		if (!*wdev) {
 			err = -ENODEV;
@@ -500,19 +467,14 @@ static int nl80211_prepare_wdev_dump(struct sk_buff *skb,
 		}
 	}
 
-	cfg80211_lock_rdev(*rdev);
-
-	mutex_unlock(&cfg80211_mutex);
 	return 0;
  out_unlock:
-	mutex_unlock(&cfg80211_mutex);
 	rtnl_unlock();
 	return err;
 }
 
 static void nl80211_finish_wdev_dump(struct cfg80211_registered_device *rdev)
 {
-	cfg80211_unlock_rdev(rdev);
 	rtnl_unlock();
 }
 
@@ -1568,7 +1530,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
 	struct nlattr **tb = nl80211_fam.attrbuf;
 	int res;
 
-	mutex_lock(&cfg80211_mutex);
+	rtnl_lock();
 	res = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
 			  tb, nl80211_fam.maxattr, nl80211_policy);
 	if (res == 0) {
@@ -1582,10 +1544,8 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
 			int ifidx = nla_get_u32(tb[NL80211_ATTR_IFINDEX]);
 
 			netdev = dev_get_by_index(sock_net(skb->sk), ifidx);
-			if (!netdev) {
-				mutex_unlock(&cfg80211_mutex);
+			if (!netdev)
 				return -ENODEV;
-			}
 			if (netdev->ieee80211_ptr) {
 				dev = wiphy_to_dev(
 					netdev->ieee80211_ptr->wiphy);
@@ -1629,7 +1589,6 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
 				    !skb->len &&
 				    cb->min_dump_alloc < 4096) {
 					cb->min_dump_alloc = 4096;
-					mutex_unlock(&cfg80211_mutex);
 					return 1;
 				}
 				idx--;
@@ -1638,7 +1597,7 @@ static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
 		} while (cb->args[1] > 0);
 		break;
 	}
-	mutex_unlock(&cfg80211_mutex);
+	rtnl_unlock();
 
 	cb->args[0] = idx;
 
@@ -1793,7 +1752,6 @@ static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
 	if (result)
 		return result;
 
-	mutex_lock(&rdev->devlist_mtx);
 	switch (iftype) {
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_P2P_GO:
@@ -1817,7 +1775,6 @@ static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
 	default:
 		result = -EINVAL;
 	}
-	mutex_unlock(&rdev->devlist_mtx);
 
 	return result;
 }
@@ -1866,6 +1823,8 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 	u32 frag_threshold = 0, rts_threshold = 0;
 	u8 coverage_class = 0;
 
+	ASSERT_RTNL();
+
 	/*
 	 * Try to find the wiphy and netdev. Normally this
 	 * function shouldn't need the netdev, but this is
@@ -1875,31 +1834,25 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 	 * also passed a netdev to set_wiphy, so that it is
 	 * possible to let that go to the right netdev!
 	 */
-	mutex_lock(&cfg80211_mutex);
 
 	if (info->attrs[NL80211_ATTR_IFINDEX]) {
 		int ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
 
 		netdev = dev_get_by_index(genl_info_net(info), ifindex);
-		if (netdev && netdev->ieee80211_ptr) {
+		if (netdev && netdev->ieee80211_ptr)
 			rdev = wiphy_to_dev(netdev->ieee80211_ptr->wiphy);
-			mutex_lock(&rdev->mtx);
-		} else
+		else
 			netdev = NULL;
 	}
 
 	if (!netdev) {
 		rdev = __cfg80211_rdev_from_attrs(genl_info_net(info),
 						  info->attrs);
-		if (IS_ERR(rdev)) {
-			mutex_unlock(&cfg80211_mutex);
+		if (IS_ERR(rdev))
 			return PTR_ERR(rdev);
-		}
 		wdev = NULL;
 		netdev = NULL;
 		result = 0;
-
-		mutex_lock(&rdev->mtx);
 	} else
 		wdev = netdev->ieee80211_ptr;
 
@@ -1912,8 +1865,6 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 		result = cfg80211_dev_rename(
 			rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
 
-	mutex_unlock(&cfg80211_mutex);
-
 	if (result)
 		goto bad_res;
 
@@ -2120,7 +2071,6 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 	}
 
  bad_res:
-	mutex_unlock(&rdev->mtx);
 	if (netdev)
 		dev_put(netdev);
 	return result;
@@ -2218,7 +2168,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
 	struct cfg80211_registered_device *rdev;
 	struct wireless_dev *wdev;
 
-	mutex_lock(&cfg80211_mutex);
+	rtnl_lock();
 	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 		if (!net_eq(wiphy_net(&rdev->wiphy), sock_net(skb->sk)))
 			continue;
@@ -2228,7 +2178,6 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
 		}
 		if_idx = 0;
 
-		mutex_lock(&rdev->devlist_mtx);
 		list_for_each_entry(wdev, &rdev->wdev_list, list) {
 			if (if_idx < if_start) {
 				if_idx++;
@@ -2237,17 +2186,15 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *
 			if (nl80211_send_iface(skb, NETLINK_CB(cb->skb).portid,
 					       cb->nlh->nlmsg_seq, NLM_F_MULTI,
 					       rdev, wdev) < 0) {
-				mutex_unlock(&rdev->devlist_mtx);
 				goto out;
 			}
 			if_idx++;
 		}
-		mutex_unlock(&rdev->devlist_mtx);
 
 		wp_idx++;
 	}
  out:
-	mutex_unlock(&cfg80211_mutex);
+	rtnl_unlock();
 
 	cb->args[0] = wp_idx;
 	cb->args[1] = if_idx;
@@ -2480,11 +2427,9 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
 		INIT_LIST_HEAD(&wdev->mgmt_registrations);
 		spin_lock_init(&wdev->mgmt_registrations_lock);
 
-		mutex_lock(&rdev->devlist_mtx);
 		wdev->identifier = ++rdev->wdev_id;
 		list_add_rcu(&wdev->list, &rdev->wdev_list);
 		rdev->devlist_generation++;
-		mutex_unlock(&rdev->devlist_mtx);
 		break;
 	default:
 		break;
@@ -2993,8 +2938,6 @@ static bool nl80211_get_ap_channel(struct cfg80211_registered_device *rdev,
 	struct wireless_dev *wdev;
 	bool ret = false;
 
-	mutex_lock(&rdev->devlist_mtx);
-
 	list_for_each_entry(wdev, &rdev->wdev_list, list) {
 		if (wdev->iftype != NL80211_IFTYPE_AP &&
 		    wdev->iftype != NL80211_IFTYPE_P2P_GO)
@@ -3008,8 +2951,6 @@ static bool nl80211_get_ap_channel(struct cfg80211_registered_device *rdev,
 		break;
 	}
 
-	mutex_unlock(&rdev->devlist_mtx);
-
 	return ret;
 }
 
@@ -3171,13 +3112,10 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 		params.radar_required = true;
 	}
 
-	mutex_lock(&rdev->devlist_mtx);
 	err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 					   params.chandef.chan,
 					   CHAN_MODE_SHARED,
 					   radar_detect_width);
-	mutex_unlock(&rdev->devlist_mtx);
-
 	if (err)
 		return err;
 
@@ -4914,18 +4852,13 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
 	void *hdr = NULL;
 	struct nlattr *nl_reg_rules;
 	unsigned int i;
-	int err = -EINVAL;
-
-	mutex_lock(&cfg80211_mutex);
 
 	if (!cfg80211_regdomain)
-		goto out;
+		return -EINVAL;
 
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
-	if (!msg) {
-		err = -ENOBUFS;
-		goto out;
-	}
+	if (!msg)
+		return -ENOBUFS;
 
 	hdr = nl80211hdr_put(msg, info->snd_portid, info->snd_seq, 0,
 			     NL80211_CMD_GET_REG);
@@ -4984,8 +4917,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
 	nla_nest_end(msg, nl_reg_rules);
 
 	genlmsg_end(msg, hdr);
-	err = genlmsg_reply(msg, info);
-	goto out;
+	return genlmsg_reply(msg, info);
 
 nla_put_failure_rcu:
 	rcu_read_unlock();
@@ -4993,10 +4925,7 @@ nla_put_failure:
 	genlmsg_cancel(msg, hdr);
 put_failure:
 	nlmsg_free(msg);
-	err = -EMSGSIZE;
-out:
-	mutex_unlock(&cfg80211_mutex);
-	return err;
+	return -EMSGSIZE;
 }
 
 static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
@@ -5062,12 +4991,9 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 		}
 	}
 
-	mutex_lock(&cfg80211_mutex);
-
 	r = set_regdom(rd);
 	/* set_regdom took ownership */
 	rd = NULL;
-	mutex_unlock(&cfg80211_mutex);
 
  bad_reg:
 	kfree(rd);
@@ -5117,7 +5043,6 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
 	if (!rdev->ops->scan)
 		return -EOPNOTSUPP;
 
-	mutex_lock(&rdev->sched_scan_mtx);
 	if (rdev->scan_req) {
 		err = -EBUSY;
 		goto unlock;
@@ -5303,7 +5228,6 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
 	}
 
  unlock:
-	mutex_unlock(&rdev->sched_scan_mtx);
 	return err;
 }
 
@@ -5375,8 +5299,6 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
 	if (ie_len > wiphy->max_sched_scan_ie_len)
 		return -EINVAL;
 
-	mutex_lock(&rdev->sched_scan_mtx);
-
 	if (rdev->sched_scan_req) {
 		err = -EINPROGRESS;
 		goto out;
@@ -5544,7 +5466,6 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
 out_free:
 	kfree(request);
 out:
-	mutex_unlock(&rdev->sched_scan_mtx);
 	return err;
 }
 
@@ -5552,17 +5473,12 @@ static int nl80211_stop_sched_scan(struct sk_buff *skb,
 				   struct genl_info *info)
 {
 	struct cfg80211_registered_device *rdev = info->user_ptr[0];
-	int err;
 
 	if (!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN) ||
 	    !rdev->ops->sched_scan_stop)
 		return -EOPNOTSUPP;
 
-	mutex_lock(&rdev->sched_scan_mtx);
-	err = __cfg80211_stop_sched_scan(rdev, false);
-	mutex_unlock(&rdev->sched_scan_mtx);
-
-	return err;
+	return __cfg80211_stop_sched_scan(rdev, false);
 }
 
 static int nl80211_start_radar_detection(struct sk_buff *skb,
@@ -5594,12 +5510,11 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
 	if (!rdev->ops->start_radar_detection)
 		return -EOPNOTSUPP;
 
-	mutex_lock(&rdev->devlist_mtx);
 	err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 					   chandef.chan, CHAN_MODE_SHARED,
 					   BIT(chandef.width));
 	if (err)
-		goto err_locked;
+		return err;
 
 	err = rdev->ops->start_radar_detection(&rdev->wiphy, dev, &chandef);
 	if (!err) {
@@ -5607,9 +5522,6 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
 		wdev->cac_started = true;
 		wdev->cac_start_time = jiffies;
 	}
-err_locked:
-	mutex_unlock(&rdev->devlist_mtx);
-
 	return err;
 }
 
@@ -6472,6 +6384,8 @@ static int nl80211_testmode_dump(struct sk_buff *skb,
 	void *data = NULL;
 	int data_len = 0;
 
+	rtnl_lock();
+
 	if (cb->args[0]) {
 		/*
 		 * 0 is a valid index, but not valid for args[0],
@@ -6483,18 +6397,16 @@ static int nl80211_testmode_dump(struct sk_buff *skb,
 				  nl80211_fam.attrbuf, nl80211_fam.maxattr,
 				  nl80211_policy);
 		if (err)
-			return err;
+			goto out_err;
 
-		mutex_lock(&cfg80211_mutex);
 		rdev = __cfg80211_rdev_from_attrs(sock_net(skb->sk),
 						  nl80211_fam.attrbuf);
 		if (IS_ERR(rdev)) {
-			mutex_unlock(&cfg80211_mutex);
-			return PTR_ERR(rdev);
+			err = PTR_ERR(rdev);
+			goto out_err;
 		}
 		phy_idx = rdev->wiphy_idx;
 		rdev = NULL;
-		mutex_unlock(&cfg80211_mutex);
 
 		if (nl80211_fam.attrbuf[NL80211_ATTR_TESTDATA])
 			cb->args[1] =
@@ -6506,14 +6418,11 @@ static int nl80211_testmode_dump(struct sk_buff *skb,
 		data_len = nla_len((void *)cb->args[1]);
 	}
 
-	mutex_lock(&cfg80211_mutex);
 	rdev = cfg80211_rdev_by_wiphy_idx(phy_idx);
 	if (!rdev) {
-		mutex_unlock(&cfg80211_mutex);
-		return -ENOENT;
+		err = -ENOENT;
+		goto out_err;
 	}
-	cfg80211_lock_rdev(rdev);
-	mutex_unlock(&cfg80211_mutex);
 
 	if (!rdev->ops->testmode_dump) {
 		err = -EOPNOTSUPP;
@@ -6554,7 +6463,7 @@ static int nl80211_testmode_dump(struct sk_buff *skb,
 	/* see above */
 	cb->args[0] = phy_idx + 1;
  out_err:
-	cfg80211_unlock_rdev(rdev);
+	rtnl_unlock();
 	return err;
 }
 
@@ -8189,9 +8098,7 @@ static int nl80211_start_p2p_device(struct sk_buff *skb, struct genl_info *info)
 	if (wdev->p2p_started)
 		return 0;
 
-	mutex_lock(&rdev->devlist_mtx);
 	err = cfg80211_can_add_interface(rdev, wdev->iftype);
-	mutex_unlock(&rdev->devlist_mtx);
 	if (err)
 		return err;
 
@@ -8200,9 +8107,7 @@ static int nl80211_start_p2p_device(struct sk_buff *skb, struct genl_info *info)
 		return err;
 
 	wdev->p2p_started = true;
-	mutex_lock(&rdev->devlist_mtx);
 	rdev->opencount++;
-	mutex_unlock(&rdev->devlist_mtx);
 
 	return 0;
 }
@@ -8218,11 +8123,7 @@ static int nl80211_stop_p2p_device(struct sk_buff *skb, struct genl_info *info)
 	if (!rdev->ops->stop_p2p_device)
 		return -EOPNOTSUPP;
 
-	mutex_lock(&rdev->devlist_mtx);
-	mutex_lock(&rdev->sched_scan_mtx);
 	cfg80211_stop_p2p_device(rdev, wdev);
-	mutex_unlock(&rdev->sched_scan_mtx);
-	mutex_unlock(&rdev->devlist_mtx);
 
 	return 0;
 }
@@ -8365,11 +8266,11 @@ static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
 		info->user_ptr[0] = rdev;
 	} else if (ops->internal_flags & NL80211_FLAG_NEED_NETDEV ||
 		   ops->internal_flags & NL80211_FLAG_NEED_WDEV) {
-		mutex_lock(&cfg80211_mutex);
+		ASSERT_RTNL();
+
 		wdev = __cfg80211_wdev_from_attrs(genl_info_net(info),
 						  info->attrs);
 		if (IS_ERR(wdev)) {
-			mutex_unlock(&cfg80211_mutex);
 			if (rtnl)
 				rtnl_unlock();
 			return PTR_ERR(wdev);
@@ -8380,7 +8281,6 @@ static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
 
 		if (ops->internal_flags & NL80211_FLAG_NEED_NETDEV) {
 			if (!dev) {
-				mutex_unlock(&cfg80211_mutex);
 				if (rtnl)
 					rtnl_unlock();
 				return -EINVAL;
@@ -8394,7 +8294,6 @@ static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
 		if (dev) {
 			if (ops->internal_flags & NL80211_FLAG_CHECK_NETDEV_UP &&
 			    !netif_running(dev)) {
-				mutex_unlock(&cfg80211_mutex);
 				if (rtnl)
 					rtnl_unlock();
 				return -ENETDOWN;
@@ -8403,17 +8302,12 @@ static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
 			dev_hold(dev);
 		} else if (ops->internal_flags & NL80211_FLAG_CHECK_NETDEV_UP) {
 			if (!wdev->p2p_started) {
-				mutex_unlock(&cfg80211_mutex);
 				if (rtnl)
 					rtnl_unlock();
 				return -ENETDOWN;
 			}
 		}
 
-		cfg80211_lock_rdev(rdev);
-
-		mutex_unlock(&cfg80211_mutex);
-
 		info->user_ptr[0] = rdev;
 	}
 
@@ -8423,8 +8317,6 @@ static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
 static void nl80211_post_doit(struct genl_ops *ops, struct sk_buff *skb,
 			      struct genl_info *info)
 {
-	if (info->user_ptr[0])
-		cfg80211_unlock_rdev(info->user_ptr[0]);
 	if (info->user_ptr[1]) {
 		if (ops->internal_flags & NL80211_FLAG_NEED_WDEV) {
 			struct wireless_dev *wdev = info->user_ptr[1];
@@ -8446,7 +8338,8 @@ static struct genl_ops nl80211_ops[] = {
 		.dumpit = nl80211_dump_wiphy,
 		.policy = nl80211_policy,
 		/* can be retrieved by unprivileged users */
-		.internal_flags = NL80211_FLAG_NEED_WIPHY,
+		.internal_flags = NL80211_FLAG_NEED_WIPHY |
+				  NL80211_FLAG_NEED_RTNL,
 	},
 	{
 		.cmd = NL80211_CMD_SET_WIPHY,
@@ -8461,7 +8354,8 @@ static struct genl_ops nl80211_ops[] = {
 		.dumpit = nl80211_dump_interface,
 		.policy = nl80211_policy,
 		/* can be retrieved by unprivileged users */
-		.internal_flags = NL80211_FLAG_NEED_WDEV,
+		.internal_flags = NL80211_FLAG_NEED_WDEV |
+				  NL80211_FLAG_NEED_RTNL,
 	},
 	{
 		.cmd = NL80211_CMD_SET_INTERFACE,
@@ -8620,6 +8514,7 @@ static struct genl_ops nl80211_ops[] = {
 		.cmd = NL80211_CMD_GET_REG,
 		.doit = nl80211_get_reg,
 		.policy = nl80211_policy,
+		.internal_flags = NL80211_FLAG_NEED_RTNL,
 		/* can be retrieved by unprivileged users */
 	},
 	{
@@ -8627,6 +8522,7 @@ static struct genl_ops nl80211_ops[] = {
 		.doit = nl80211_set_reg,
 		.policy = nl80211_policy,
 		.flags = GENL_ADMIN_PERM,
+		.internal_flags = NL80211_FLAG_NEED_RTNL,
 	},
 	{
 		.cmd = NL80211_CMD_REQ_SET_REG,
@@ -9082,8 +8978,6 @@ static int nl80211_add_scan_req(struct sk_buff *msg,
 	struct nlattr *nest;
 	int i;
 
-	lockdep_assert_held(&rdev->sched_scan_mtx);
-
 	if (WARN_ON(!req))
 		return 0;