linux-kernel - [PATCH v3 2/2] PM: ACPI: reboot: Reinstate S5 for reboot

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Message-Id: <20220913062042.1977790-2-kai.heng.feng@canonical.com>
Date:   Tue, 13 Sep 2022 14:20:40 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     rafael.j.wysocki@...el.com, lenb@...nel.org
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Josef Bacik <josef@...icpanda.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] PM: ACPI: reboot: Reinstate S5 for reboot

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

The issue is fixed by commit 2ca1c94ce0b6 ("tg3: Disable tg3 device on
system reboot to avoid triggering AER"), so use the new sysoff API to
reinstate S5 for reboot on ACPI-based systems.

Cc: Josef Bacik <josef@...icpanda.com>
Suggested-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
v3:
 - Use new API to invoke ACPI S5.

v2:
 - Use do_kernel_power_off_prepare() instead.

 drivers/acpi/sleep.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index ad4b2987b3d6e..dce5460902eed 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -1088,6 +1088,10 @@ int __init acpi_sleep_init(void)
 		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
 					 SYS_OFF_PRIO_FIRMWARE,
 					 acpi_power_off, NULL);
+
+		register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
+					 SYS_OFF_PRIO_FIRMWARE,
+					 acpi_power_off_prepare, NULL);
 	} else {
 		acpi_no_s5 = true;
 	}
-- 
2.36.1