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Keep cn_tab NULL until an appropriate console is found (avoids interrupt 

problems between some console devices and some net devices) - adapted from
the Shark code for cninit.c.
This commit is contained in:
tv 1998-06-21 22:36:46 +00:00
parent 865838bfd7
commit 9664a6fbae
1 changed files with 22 additions and 7 deletions
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29
sys/dev/cninit.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: cninit.c,v 1.2 1995/04/11 22:08:10 pk Exp $ */
/* $NetBSD: cninit.c,v 1.3 1998/06/21 22:36:46 tv Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -62,8 +62,10 @@ extern struct consdev *cn_tab; /* physical console device info */
void
cninit()
{
register struct consdev *cp;
struct consdev *cp;
struct consdev *bestMatch;
bestMatch = cn_tab = NULL;
/*
* Collect information about all possible consoles
* and find the one with highest priority
@ -71,16 +73,29 @@ cninit()
for (cp = constab; cp->cn_probe; cp++) {
(*cp->cn_probe)(cp);
if (cp->cn_pri > CN_DEAD &&
(cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
cn_tab = cp;
(bestMatch == NULL || cp->cn_pri > bestMatch->cn_pri)) {
bestMatch = cp;
}
}
/*
* No console, we can handle it
*/
if ((cp = cn_tab) == NULL)
if ((cp = bestMatch) == NULL)
return;
/*
* Turn on console
*/
(*cp->cn_init)(cp);
{
struct consdev *old_cn_tab = cn_tab;
(*cp->cn_init)(cp);
/*
* Now let everyone know we have an active console they can
* use for diagnostics. If we use cn_tab in the search loop
* then interrupts from the ethernet at boot may cause system
* hang.
*/
if (cn_tab == old_cn_tab)
cn_tab = bestMatch;
}
}