5.15-stable review patch. If anyone has any objections, please let me know.
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From: Jiaxun Yang jiaxun.yang@flygoat.com
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@vger.kernel.org Signed-off-by: Jiaxun Yang jiaxun.yang@flygoat.com Signed-off-by: Thomas Bogendoerfer tsbogend@alpha.franken.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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);