These WWAN network interface operations (create/delete/open/close)
are already protected by RTNL lock, i.e., wwan_ops.newlink(),
wwan_ops.dellink(), net_device_ops.ndo_open() and
net_device.ndo_stop() are called with RTNL lock held.
Therefore, this patch removes the unnecessary if_mutex.
Signed-off-by: NZhaoping Shu <zhaoping.shu@mediatek.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>