Revert "bridge: use _bh spinlock variant for br_fdb_update to avoid lockup"

This reverts commit 1d7c4903.

Nikolay Aleksandrov has a better version of this fix.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_fdb.c

@@ -569,7 +569,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 				fdb_notify(br, fdb, RTM_NEWNEIGH);
 		}
 	} else {
-		spin_lock_bh(&br->hash_lock);
+		spin_lock(&br->hash_lock);
 		if (likely(!fdb_find(head, addr, vid))) {
 			fdb = fdb_create(head, source, addr, vid);
 			if (fdb) {
@@ -581,7 +581,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 		/* else  we lose race and someone else inserts
 		 * it first, don't bother updating
 		 */
-		spin_unlock_bh(&br->hash_lock);
+		spin_unlock(&br->hash_lock);
 	}
 }