5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
commit 4e7ca0b57f3bc09ba3e4ab86bf6b7c35134bfd04 upstream.
We should always use firmware's poweroff & reboot service
if it's available as firmware may need to perform more task
than platform's syscon etc.
However _machine_restart & poweroff hooks are registered at
low priority, which means platform reboot driver can override
them.
Register firmware based reboot/poweroff implementation with
register_sys_off_handler with appropriate priority so that
they will be prioritised. Remove _machine_halt hook as it's
deemed to be unnecessary.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/loongson64/reset.c | 38 ++++++++++++++++----------------------
1 file changed, 16 insertions(+), 22 deletions(-)
--- a/arch/mips/loongson64/reset.c
+++ b/arch/mips/loongson64/reset.c
@@ -11,6 +11,7 @@
#include <linux/init.h>
#include <linux/kexec.h>
#include <linux/pm.h>
+#include <linux/reboot.h>
#include <linux/slab.h>
#include <asm/bootinfo.h>
@@ -21,36 +22,21 @@
#include <loongson.h>
#include <boot_param.h>
-static void loongson_restart(char *command)
+static int firmware_restart(struct sys_off_data *unusedd)
{
void (*fw_restart)(void) = (void *)loongson_sysconf.restart_addr;
fw_restart();
- while (1) {
- if (cpu_wait)
- cpu_wait();
- }
+ return NOTIFY_DONE;
}
-static void loongson_poweroff(void)
+static int firmware_poweroff(struct sys_off_data *unused)
{
void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr;
fw_poweroff();
- while (1) {
- if (cpu_wait)
- cpu_wait();
- }
-}
-
-static void loongson_halt(void)
-{
- pr_notice("\n\n** You can safely turn off the power now **\n\n");
- while (1) {
- if (cpu_wait)
- cpu_wait();
- }
+ return NOTIFY_DONE;
}
#ifdef CONFIG_KEXEC
@@ -154,9 +140,17 @@ static void loongson_crash_shutdown(stru
static int __init mips_reboot_setup(void)
{
- _machine_restart = loongson_restart;
- _machine_halt = loongson_halt;
- pm_power_off = loongson_poweroff;
+ if (loongson_sysconf.restart_addr) {
+ register_sys_off_handler(SYS_OFF_MODE_RESTART,
+ SYS_OFF_PRIO_FIRMWARE,
+ firmware_restart, NULL);
+ }
+
+ if (loongson_sysconf.poweroff_addr) {
+ register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
+ SYS_OFF_PRIO_FIRMWARE,
+ firmware_poweroff, NULL);
+ }
#ifdef CONFIG_KEXEC
kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
