open_dchannel
err = open_dchannel(hc, dch, rq); /* locked there */
err = open_dchannel(hc, dch, rq); /* locked there */
err = open_dchannel(hc, ch, rq);
err = open_dchannel(hw, ch, rq);
isac->open = open_dchannel;
err = open_dchannel(card, rq, __builtin_return_address(0));
err = open_dchannel(hc, dch, rq);
err = open_dchannel(hc, dch, rq);