brcmf_net_attach
err = brcmf_net_attach(ifp, true);
ret = brcmf_net_attach(ifp, false);
int brcmf_net_attach(struct brcmf_if *ifp, bool locked);
if (brcmf_net_attach(ifp, false) < 0)
err = brcmf_net_attach(ifp, true);