linux-kernel - [PATCH v2] PM: ACPI: reboot: Reinstate S5 for reboot

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Date:   Tue,  6 Sep 2022 22:31:07 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     rafael.j.wysocki@...el.com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Josef Bacik <josef@...icpanda.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Petr Mladek <pmladek@...e.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        tangmeng <tangmeng@...ontech.com>,
        YueHaibing <yuehaibing@...wei.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2] PM: ACPI: reboot: Reinstate S5 for reboot

Commit d60cd06331a3 ("PM: ACPI: reboot: Use S5 for reboot") caused Dell
PowerEdge r440 hangs at boot.

The issue is fixed by commit 2ca1c94ce0b6 ("tg3: Disable tg3 device on
system reboot to avoid triggering AER"), so reinstate the patch again.

Cc: Josef Bacik <josef@...icpanda.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
v2:
 - Use do_kernel_power_off_prepare() instead.

 kernel/reboot.c | 55 +++++++++++++++++++++++++------------------------
 1 file changed, 28 insertions(+), 27 deletions(-)

diff --git a/kernel/reboot.c b/kernel/reboot.c
index 3c35445bf5ad3..39cbb45afc54a 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -243,28 +243,6 @@ void migrate_to_reboot_cpu(void)
 	set_cpus_allowed_ptr(current, cpumask_of(cpu));
 }
 
-/**
- *	kernel_restart - reboot the system
- *	@cmd: pointer to buffer containing command to execute for restart
- *		or %NULL
- *
- *	Shutdown everything and perform a clean reboot.
- *	This is not safe to call in interrupt context.
- */
-void kernel_restart(char *cmd)
-{
-	kernel_restart_prepare(cmd);
-	migrate_to_reboot_cpu();
-	syscore_shutdown();
-	if (!cmd)
-		pr_emerg("Restarting system\n");
-	else
-		pr_emerg("Restarting system with command '%s'\n", cmd);
-	kmsg_dump(KMSG_DUMP_SHUTDOWN);
-	machine_restart(cmd);
-}
-EXPORT_SYMBOL_GPL(kernel_restart);
-
 static void kernel_shutdown_prepare(enum system_states state)
 {
 	blocking_notifier_call_chain(&reboot_notifier_list,
@@ -301,6 +279,34 @@ static BLOCKING_NOTIFIER_HEAD(power_off_prep_handler_list);
  */
 static ATOMIC_NOTIFIER_HEAD(power_off_handler_list);
 
+static void do_kernel_power_off_prepare(void)
+{
+	blocking_notifier_call_chain(&power_off_prep_handler_list, 0, NULL);
+}
+
+/**
+ *	kernel_restart - reboot the system
+ *	@cmd: pointer to buffer containing command to execute for restart
+ *		or %NULL
+ *
+ *	Shutdown everything and perform a clean reboot.
+ *	This is not safe to call in interrupt context.
+ */
+void kernel_restart(char *cmd)
+{
+	kernel_restart_prepare(cmd);
+	do_kernel_power_off_prepare();
+	migrate_to_reboot_cpu();
+	syscore_shutdown();
+	if (!cmd)
+		pr_emerg("Restarting system\n");
+	else
+		pr_emerg("Restarting system with command '%s'\n", cmd);
+	kmsg_dump(KMSG_DUMP_SHUTDOWN);
+	machine_restart(cmd);
+}
+EXPORT_SYMBOL_GPL(kernel_restart);
+
 static int sys_off_notify(struct notifier_block *nb,
 			  unsigned long mode, void *cmd)
 {
@@ -606,11 +612,6 @@ static int legacy_pm_power_off(struct sys_off_data *data)
 	return NOTIFY_DONE;
 }
 
-static void do_kernel_power_off_prepare(void)
-{
-	blocking_notifier_call_chain(&power_off_prep_handler_list, 0, NULL);
-}
-
 /**
  *	do_kernel_power_off - Execute kernel power-off handler call chain
  *
-- 
2.36.1