[src/trunk]: src/sys/arch/arm/arm Only try to call EFI RT's reset once. If it...

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

details:   https://anonhg.NetBSD.org/src/rev/db8e8077cc8f
branches:  trunk
changeset: 457947:db8e8077cc8f
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Thu Jul 25 02:00:40 2019 +0000

description:
Only try to call EFI RT's reset once. If it faults for some reason, just
return an error so the kernel will try to PSCI reset instead. Otherwise
we get stuck in an endless loop..

diffstat:

 sys/arch/arm/arm/efi_runtime.c |  12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diffs (39 lines):

diff -r 35046bedf7d8 -r db8e8077cc8f sys/arch/arm/arm/efi_runtime.c
--- a/sys/arch/arm/arm/efi_runtime.c    Thu Jul 25 01:18:05 2019 +0000
+++ b/sys/arch/arm/arm/efi_runtime.c    Thu Jul 25 02:00:40 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: efi_runtime.c,v 1.1 2018/10/28 10:21:42 jmcneill Exp $ */
+/* $NetBSD: efi_runtime.c,v 1.2 2019/07/25 02:00:40 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: efi_runtime.c,v 1.1 2018/10/28 10:21:42 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: efi_runtime.c,v 1.2 2019/07/25 02:00:40 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/mutex.h>
@@ -113,13 +113,19 @@
 int
 arm_efirt_reset(enum efi_reset type)
 {
+       static int reset_called = false;
        efi_status status;
 
        if (RT == NULL || RT->rt_reset == NULL)
                return ENXIO;
 
        mutex_enter(&efi_lock);
-       status = RT->rt_reset(type, 0, 0, NULL);
+       if (reset_called == false) {
+               reset_called = true;
+               status = RT->rt_reset(type, 0, 0, NULL);
+       } else {
+               status = 1;
+       }
        mutex_exit(&efi_lock);
        if (status)
                return EIO;