ITOH Yasufumi <itohy@netbsd.org> writes:

> Modified Files:
> 	syssrc/sys/compat/common: tty_43.c
> 	syssrc/sys/net: if_sl.c if_strip.c

We need to reset to the default line discipline instead of setting to
NULL.  What happen someone open a tty after slattach exits.

IMHO, leaving t_linesw as NULL just makes code complex.

And, it is better to test t_linesw directly against each &xxxx_disc
instead of testing l_no, isn't it?

enami.