set insn_config to insn_inval if it is NULL

diff --git a/comedi/drivers.c b/comedi/drivers.c
index 276f5c2f4d0e21dca73794092301d435c92d224b..32e854f5965b9336fa4770d7f83098dafa1bd1a1 100644 (file)
--- a/comedi/drivers.c
+++ b/comedi/drivers.c
@@ -273,6 +273,7 @@ static int postconfig(comedi_device *dev)
                if(!s->insn_read)s->insn_read = insn_inval;
                if(!s->insn_write)s->insn_write = insn_inval;
                if(!s->insn_bits)s->insn_bits = insn_inval;
+               if(!s->insn_config)s->insn_config = insn_inval;
 
                if(!s->poll)s->poll=poll_invalid;
        }