ieee802154: netlink add rtnl lock

This patch adds rtnl lock hold mechanism while accessing wpan_dev
attributes. Furthermore these attributes should be protected by rtnl
lock and netif_running only.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/ieee802154/nl-mac.c

@@ -113,7 +113,9 @@ static int ieee802154_nl_fill_iface(struct sk_buff *msg, u32 portid,
 	if (ops->get_mac_params) {
 		struct ieee802154_mac_params params;
 
+		rtnl_lock();
 		ops->get_mac_params(dev, &params);
+		rtnl_unlock();
 
 		if (nla_put_s8(msg, IEEE802154_ATTR_TXPOWER,
 			       params.transmit_power) ||
@@ -348,8 +350,10 @@ int ieee802154_start_req(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 	}
 
+	rtnl_lock();
 	ret = ieee802154_mlme_ops(dev)->start_req(dev, &addr, channel, page,
 		bcn_ord, sf_ord, pan_coord, blx, coord_realign);
+	rtnl_unlock();
 
 	/* FIXME: add validation for unused parameters to be sane
 	 * for SoftMAC
@@ -497,6 +501,7 @@ int ieee802154_set_macparams(struct sk_buff *skb, struct genl_info *info)
 	phy = dev->ieee802154_ptr->wpan_phy;
 	get_device(&phy->dev);
 
+	rtnl_lock();
 	ops->get_mac_params(dev, &params);
 
 	if (info->attrs[IEEE802154_ATTR_TXPOWER])
@@ -524,6 +529,7 @@ int ieee802154_set_macparams(struct sk_buff *skb, struct genl_info *info)
 		params.frame_retries = nla_get_s8(info->attrs[IEEE802154_ATTR_FRAME_RETRIES]);
 
 	rc = ops->set_mac_params(dev, &params);
+	rtnl_unlock();
 
 	wpan_phy_put(phy);
 	dev_put(dev);

net/mac802154/mac_cmd.c

@@ -39,6 +39,8 @@ static int mac802154_mlme_start_req(struct net_device *dev,
 	struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
 	int rc = 0;
 
+	ASSERT_RTNL();
+
 	BUG_ON(addr->mode != IEEE802154_ADDR_SHORT);
 
 	mac802154_dev_set_pan_id(dev, addr->pan_id);
@@ -75,7 +77,8 @@ static int mac802154_set_mac_params(struct net_device *dev,
 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 	int ret;
 
-	mutex_lock(&sdata->local->iflist_mtx);
+	ASSERT_RTNL();
+
 	/* PHY */
 	wpan_dev->wpan_phy->transmit_power = params->transmit_power;
 	wpan_dev->wpan_phy->cca_mode = params->cca_mode;
@@ -87,7 +90,6 @@ static int mac802154_set_mac_params(struct net_device *dev,
 	wpan_dev->csma_retries = params->csma_retries;
 	wpan_dev->frame_retries = params->frame_retries;
 	wpan_dev->lbt = params->lbt;
-	mutex_unlock(&sdata->local->iflist_mtx);
 
 	if (local->hw.flags & IEEE802154_HW_TXPOWER) {
 		ret = drv_set_tx_power(local, params->transmit_power);
@@ -116,7 +118,8 @@ static void mac802154_get_mac_params(struct net_device *dev,
 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
 
-	mutex_lock(&sdata->local->iflist_mtx);
+	ASSERT_RTNL();
+
 	/* PHY */
 	params->transmit_power = wpan_dev->wpan_phy->transmit_power;
 	params->cca_mode = wpan_dev->wpan_phy->cca_mode;
@@ -128,7 +131,6 @@ static void mac802154_get_mac_params(struct net_device *dev,
 	params->csma_retries = wpan_dev->csma_retries;
 	params->frame_retries = wpan_dev->frame_retries;
 	params->lbt = wpan_dev->lbt;
-	mutex_unlock(&sdata->local->iflist_mtx);
 }
 
 static struct ieee802154_llsec_ops mac802154_llsec_ops = {