Date: Mon, 2 Dec 1996 12:42:24 -0800 From: "Jin Guojun[ITG]" <jin@george.lbl.gov> To: bugs@freebsd.org Cc: hackers@freebsd.org Subject: LKM issues Message-ID: <199612022042.MAA28760@george.lbl.gov>
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I remember that someone said that the LKM does not work for character device,
but the message seems not saying why.
I traced the code and found one problem:
(1) _lkm_dev(lkmtp, cmd) did not do any thing for LM_DT_CHAR,
switch(cmd) {
case LKM_E_LOAD:
/* don't load twice! */
if (lkmexists(lkmtp))
return(EEXIST);
switch(args->lkm_devtype) {
...
case LM_DT_CHAR:
break;
...
so that unload a loaded character device driver will crash at (!!!):
case LKM_E_UNLOAD:
/* current slot... */
i = args->lkm_offset;
switch(args->lkm_devtype) {
...
case LM_DT_CHAR:
/* replace current slot contents with old contents */
!!! cdevsw_add(&descrip, args->lkm_olddev.cdev,NULL);
break;
... }
-----------------------------------------------
A separated question:
Should a loadable network driver use MOD_MISC(name)?
It seems there is a LM_STRMOD slot, but no MOD_STR(...) exists.
Should the MOD_STR() be used for network driver ? or will it be used for
something else?
Thanks,
-Jin
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