[src/netbsd-9]: src/sys/arch/alpha/alpha Pull up following revision(s) (reque...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a61b3d19ff00
branches:  netbsd-9
changeset: 937981:a61b3d19ff00
user:      martin <martin%NetBSD.org@localhost>
date:      Sat Aug 29 17:02:36 2020 +0000

description:
Pull up following revision(s) (requested by thorpej in ticket #1069):

        sys/arch/alpha/alpha/prom.c: revision 1.52

Make sure init_prom_interface() only runs once, otherwise we initialize
a mutex twice, and that upsets LOCKDEBUG.  But instead of seeing a
proper message about it, the output happens before the PROM console
interfcace is initialized, we would end up with a translation fault
back into SRM.

diffstat:

 sys/arch/alpha/alpha/prom.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (38 lines):

diff -r 511de1287f31 -r a61b3d19ff00 sys/arch/alpha/alpha/prom.c
--- a/sys/arch/alpha/alpha/prom.c       Sat Aug 29 17:00:28 2020 +0000
+++ b/sys/arch/alpha/alpha/prom.c       Sat Aug 29 17:02:36 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: prom.c,v 1.50 2018/09/03 16:29:22 riastradh Exp $ */
+/* $NetBSD: prom.c,v 1.50.4.1 2020/08/29 17:02:36 martin Exp $ */
 
 /*
  * Copyright (c) 1992, 1994, 1995, 1996 Carnegie Mellon University
@@ -27,7 +27,7 @@
 
 #include <sys/cdefs.h>                 /* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: prom.c,v 1.50 2018/09/03 16:29:22 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: prom.c,v 1.50.4.1 2020/08/29 17:02:36 martin Exp $");
 
 #include "opt_multiprocessor.h"
 
@@ -78,6 +78,11 @@
 void
 init_prom_interface(struct rpb *rpb)
 {
+       static bool prom_interface_initialized;
+
+       if (prom_interface_initialized)
+               return;
+
        struct crb *c;
 
        c = (struct crb *)((char *)rpb + rpb->rpb_crb_off);
@@ -86,6 +91,7 @@
        prom_dispatch_v.routine = c->crb_v_dispatch->entry_va;
 
        mutex_init(&prom_lock, MUTEX_DEFAULT, IPL_HIGH);
+       prom_interface_initialized = true;
 }
 
 void