[Xen-devel] [PATCH 30/44] acpi: Register poweroff handler with kernel poweroff handler

[Guenter Roeck <linux@xxxxxxxxxxxx>]

Register with kernel poweroff handler instead of setting pm_power_off
directly. Register with high priority value of 192 to reflect that
the driver explicitly overrides existing poweroff handlers.

Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
 drivers/acpi/sleep.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 54da4a3..25aad22 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -15,6 +15,8 @@
 #include <linux/dmi.h>
 #include <linux/device.h>
 #include <linux/suspend.h>
+#include <linux/notifier.h>
+#include <linux/pm.h>
 #include <linux/reboot.h>
 #include <linux/acpi.h>
 #include <linux/module.h>
@@ -811,14 +813,22 @@ static void acpi_power_off_prepare(void)
        acpi_disable_all_gpes();
 }
 
-static void acpi_power_off(void)
+static int acpi_power_off(struct notifier_block *this,
+                         unsigned long unused1, void *unused2)
 {
        /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
        printk(KERN_DEBUG "%s called\n", __func__);
        local_irq_disable();
        acpi_enter_sleep_state(ACPI_STATE_S5);
+
+       return NOTIFY_DONE;
 }
 
+static struct notifier_block acpi_poweroff_nb = {
+       .notifier_call = acpi_power_off,
+       .priority = 192,
+};
+
 int __init acpi_sleep_init(void)
 {
        char supported[ACPI_S_STATE_COUNT * 3 + 1];
@@ -835,7 +845,8 @@ int __init acpi_sleep_init(void)
        if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
                sleep_states[ACPI_STATE_S5] = 1;
                pm_power_off_prepare = acpi_power_off_prepare;
-               pm_power_off = acpi_power_off;
+               if (register_poweroff_handler(&acpi_poweroff_nb))
+                       pr_err("acpi: Failed to register poweroff handler\n");
        }
 
        supported[0] = 0;
-- 
1.9.1


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