rtnetlink dump operations also share the rrtnl_mutex

Hi all,


When a netlink_route socket was created, the nlk->cb_mutex is get through nl_table[NETLINK_ROUTE].cb_mutex which is the rtnl_mutex.


So all the netlink_route dump operation can contend for each other (ip l, ip a, ip r, tc ls). It will also contend with other RTM_NEW/DEL operations.


So there can be a good way for each msgtype have their own mutex for dump operations?


BR

wenxu