mac802154: remove mib lock

This patch removes the mib lock. The new locking mechanism is to protect
the mib values with the rtnl lock. Note that this isn't always necessary
if we have an interface up the most mib values are readonly (e.g.
address settings). With this behaviour we can remove locking in
hotpath like frame parsing completely. It depends on context if we need
to hold the rtnl lock or not, this makes the callbacks of
ieee802154_mlme_ops unnecessary because these callbacks hols always the
locks.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/mac802154/iface.c

@@ -63,7 +63,6 @@ mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	int err = -ENOIOCTLCMD;
 
 	rtnl_lock();
-	spin_lock_bh(&sdata->mib_lock);
 
 	switch (cmd) {
 	case SIOCGIFADDR:
@@ -88,7 +87,6 @@ mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	}
 	case SIOCSIFADDR:
 		if (netif_running(dev)) {
-			spin_unlock_bh(&sdata->mib_lock);
 			rtnl_unlock();
 			return -EBUSY;
 		}
@@ -111,7 +109,6 @@ mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 		break;
 	}
 
-	spin_unlock_bh(&sdata->mib_lock);
 	rtnl_unlock();
 	return err;
 }
@@ -374,8 +371,6 @@ static int mac802154_header_create(struct sk_buff *skb,
 		return -EINVAL;
 
 	if (!saddr) {
-		spin_lock_bh(&sdata->mib_lock);
-
 		if (wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
 		    wpan_dev->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
 		    wpan_dev->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
@@ -387,8 +382,6 @@ static int mac802154_header_create(struct sk_buff *skb,
 		}
 
 		hdr.source.pan_id = wpan_dev->pan_id;
-
-		spin_unlock_bh(&sdata->mib_lock);
 	} else {
 		hdr.source = *(const struct ieee802154_addr *)saddr;
 	}
@@ -500,7 +493,6 @@ ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
 		sdata->dev->ml_priv = &mac802154_mlme_wpan;
 		wpan_dev->promiscuous_mode = false;
 
-		spin_lock_init(&sdata->mib_lock);
 		mutex_init(&sdata->sec_mtx);
 
 		mac802154_llsec_init(&sdata->sec);