Commit 6f389a8f authored by Huacai Chen's avatar Huacai Chen Committed by Rafael J. Wysocki

PM / reboot: call syscore_shutdown() after disable_nonboot_cpus()

As commit 40dc166c (PM / Core: Introduce struct syscore_ops for core
subsystems PM) say, syscore_ops operations should be carried with one
CPU on-line and interrupts disabled. However, after commit f96972f2
(kernel/sys.c: call disable_nonboot_cpus() in kernel_restart()),
syscore_shutdown() is called before disable_nonboot_cpus(), so break
the rules. We have a MIPS machine with a 8259A PIC, and there is an
external timer (HPET) linked at 8259A. Since 8259A has been shutdown
too early (by syscore_shutdown()), disable_nonboot_cpus() runs without
timer interrupt, so it hangs and reboot fails. This patch call
syscore_shutdown() a little later (after disable_nonboot_cpus()) to
avoid reboot failure, this is the same way as poweroff does.

For consistency, add disable_nonboot_cpus() to kernel_halt().
Signed-off-by: default avatarHuacai Chen <chenhc@lemote.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent ec376a2a
...@@ -324,7 +324,6 @@ void kernel_restart_prepare(char *cmd) ...@@ -324,7 +324,6 @@ void kernel_restart_prepare(char *cmd)
system_state = SYSTEM_RESTART; system_state = SYSTEM_RESTART;
usermodehelper_disable(); usermodehelper_disable();
device_shutdown(); device_shutdown();
syscore_shutdown();
} }
/** /**
...@@ -370,6 +369,7 @@ void kernel_restart(char *cmd) ...@@ -370,6 +369,7 @@ void kernel_restart(char *cmd)
{ {
kernel_restart_prepare(cmd); kernel_restart_prepare(cmd);
disable_nonboot_cpus(); disable_nonboot_cpus();
syscore_shutdown();
if (!cmd) if (!cmd)
printk(KERN_EMERG "Restarting system.\n"); printk(KERN_EMERG "Restarting system.\n");
else else
...@@ -395,6 +395,7 @@ static void kernel_shutdown_prepare(enum system_states state) ...@@ -395,6 +395,7 @@ static void kernel_shutdown_prepare(enum system_states state)
void kernel_halt(void) void kernel_halt(void)
{ {
kernel_shutdown_prepare(SYSTEM_HALT); kernel_shutdown_prepare(SYSTEM_HALT);
disable_nonboot_cpus();
syscore_shutdown(); syscore_shutdown();
printk(KERN_EMERG "System halted.\n"); printk(KERN_EMERG "System halted.\n");
kmsg_dump(KMSG_DUMP_HALT); kmsg_dump(KMSG_DUMP_HALT);
......
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