SFP_MOD_PRESENT
sfp_sm_mod_next(sfp, SFP_MOD_PRESENT, 0);
case SFP_MOD_PRESENT:
(sfp->sm_mod_state != SFP_MOD_PRESENT ||
if (sfp->sm_mod_state != SFP_MOD_PRESENT ||
[SFP_MOD_PRESENT] = "present",